如何從BasicFile遷移到SecureFile存儲

　Oracle 11g新的SecureFile存儲特性擴展了大對象(LOB)的靈活性和容量，本文研究如何有效地從BasicFile遷移到SecureFile存儲，如何測量SecureFile vs BasicFile LOB的效率，以及如何爲SecureFile LOB使用不同的壓縮和重複數據刪除選項。

　　我創建了一個新表TRBTKT.SECURE_TICKETS重新定義了原始表TRBTKT.TICKETS的結構，將原始的BasicFile LOB映射到對應的SecureFile LOB，然後執行了一條INSERT INTO … SELECT FROM DML語句將原始表中的內容傳輸到新表中。

　　在一個相對簡單的應用程序環境中，這種載入方式足以應付，但目前在數據倉庫和商業智能應用程序中廣泛地使用了LOB，特別是存儲那些包含了複雜商務交易的XML文檔和醫院信息系統捕獲到的醫療影像數據。

　　爲了便於說明，我使用清單1中的代碼重新創建了這兩個表，我使用了列表分區對這兩個表進行了分區，在清單2中，我使用更大的數據重新載入TRBTKT.TICKETS表。

　　清單1 使用列表分區重新創建這兩個表以模擬數據倉庫環境

-- 重新創建表TRBTKT.TICKETS，這次包括了一個STATUS列
CREATE TABLE trbtkt.tickets (
     tkt_id         NUMBER
    ,description    VARCHAR2(30)
    ,submit_dtm     TIMESTAMP
    ,status         VARCHAR2(8)
    ,document       BLOB
    ,scrnimg        BLOB
)
    LOB(document)   
        STORE AS BASICFILE (TABLESPACE basicfiles)
   ,LOB(scrnimg)    
        STORE AS BASICFILE (TABLESPACE basicfiles)
    PARTITION BY LIST (status) (
        PARTITION sts_open 
            VALUES ('OPEN')
       ,PARTITION sts_pending
            VALUES ('PENDING')
       ,PARTITION sts_closed
            VALUES ('CLOSED')
       ,PARTITION sts_other
            VALUES (DEFAULT)
    )
;

--註釋
COMMENT ON TABLE trbtkt.tickets
    IS 'Contains Trouble Ticket transaction data';
COMMENT ON COLUMN trbtkt.tickets.tkt_id
    IS 'Unique identifier for a Trouble Ticket';
COMMENT ON COLUMN trbtkt.tickets.description
    IS 'Trouble Ticket Description';
COMMENT ON COLUMN trbtkt.tickets.submit_dtm
    IS 'Trouble Ticket Submission Time Stamp';
COMMENT ON COLUMN trbtkt.tickets.status
    IS 'Trouble Ticket Status';
COMMENT ON COLUMN trbtkt.tickets.document
    IS 'Large Object (LOB) that contains a Microsoft Word document that provides detailed information about a Trouble Ticket';
COMMENT ON COLUMN trbtkt.tickets.scrnimg
    IS 'Large Object (LOB) that contains a screen print or other image that helps a problem solver identify how to act on a Trouble Ticket';

-- 創建索引和約束
CREATE UNIQUE INDEX trbtkt.tickets_pk_idx
    ON trbtkt.tickets(tkt_id)
    TABLESPACE users;

ALTER TABLE trbtkt.tickets
    ADD CONSTRAINT tickets_pk
    PRIMARY KEY (tkt_id);

-----
-- 創建表TRBTKT.SECURE_TICKETS的一個改良版本，使用分區劃分SecureFile LOB的存儲，基於STATUS 的值設置合適的保留週期
DROP TABLE trbtkt.secure_tickets PURGE;
CREATE TABLE trbtkt.secure_tickets (
     tkt_id         NUMBER
    ,description    VARCHAR2(30)
    ,submit_dtm     TIMESTAMP
    ,status         VARCHAR2(8)
    ,document       BLOB
    ,scrnimg        BLOB
)
    LOB(document)   
        STORE AS SECUREFILE (
            TABLESPACE securefiles
            DISABLE STORAGE IN ROW
            CACHE
        )
   ,LOB(scrnimg)    
        STORE AS SECUREFILE (
            TABLESPACE securefiles
            DISABLE STORAGE IN ROW
            CACHE READS
        )
    PARTITION BY LIST (status) (
        PARTITION sts_open 
            VALUES ('OPEN')
                LOB (document) STORE AS SECUREFILE (KEEP_DUPLICATES NOCOMPRESS)
               ,LOB (scrnimg)  STORE AS SECUREFILE (KEEP_DUPLICATES COMPRESS)
       ,PARTITION sts_pending
            VALUES ('PENDING')
                LOB (document) STORE AS SECUREFILE (KEEP_DUPLICATES NOCOMPRESS)
               ,LOB (scrnimg)  STORE AS SECUREFILE (DEDUPLICATE COMPRESS)
       ,PARTITION sts_closed
            VALUES ('CLOSED')
                LOB (document) STORE AS SECUREFILE (DEDUPLICATE COMPRESS)
               ,LOB (scrnimg)  STORE AS SECUREFILE (DEDUPLICATE COMPRESS HIGH)
       ,PARTITION sts_other
            VALUES (DEFAULT)
                LOB (document) STORE AS SECUREFILE (DEDUPLICATE COMPRESS HIGH)
               ,LOB (scrnimg)  STORE AS SECUREFILE (DEDUPLICATE COMPRESS HIGH)
    )
;

--註釋
COMMENT ON TABLE trbtkt.secure_tickets
    IS 'Contains Trouble Ticket transaction data';
COMMENT ON COLUMN trbtkt.secure_tickets.tkt_id
    IS 'Unique identifier for a Trouble Ticket';
COMMENT ON COLUMN trbtkt.secure_tickets.description
    IS 'Trouble Ticket Description';
COMMENT ON COLUMN trbtkt.secure_tickets.submit_dtm
    IS 'Trouble Ticket Submission Time Stamp';
COMMENT ON COLUMN trbtkt.secure_tickets.status
    IS 'Trouble Ticket Status';
COMMENT ON COLUMN trbtkt.secure_tickets.document
    IS 'Large Object (LOB) that contains a Microsoft Word document that provides detailed information about a Trouble Ticket';
COMMENT ON COLUMN trbtkt.secure_tickets.scrnimg
    IS 'Large Object (LOB) that contains a screen print or other image that helps a problem solver identify how to act on a Trouble Ticket';

　　　清單2 使用附加數據重新載入表TRBTKT.TICKETS

SET SERVEROUTPUT ON
TRUNCATE TABLE trbtkt.tickets;

BEGIN

    trbtkt.pkg_securefiles.AddTroubleTicket (
         tkt_id => 101
        ,description => 'Trouble Ticket 101'
        ,submit_dts => '2008-12-31 23:45:00'
        ,status => 'OPEN'
        ,docFileName => 'New_101.doc'
        ,imgFileName => 'DBRIssues.jpg'
    );

    trbtkt.pkg_securefiles.AddTroubleTicket (
         tkt_id => 102
        ,description => 'Trouble Ticket 102'
        ,submit_dts => '2009-01-04 00:00:00'
        ,status => 'OPEN'
        ,docFileName => 'New_102.doc'
        ,imgFileName => 'Unresolved.jpg'
    );

    trbtkt.pkg_securefiles.AddTroubleTicket (
         tkt_id => 103
        ,description => 'Trouble Ticket 103'
        ,submit_dts => '2009-01-02 00:00:00'
        ,status => 'OPEN'
        ,docFileName => 'New_103.doc'
        ,imgFileName => 'Unresolved.jpg'
     );

    trbtkt.pkg_securefiles.AddTroubleTicket (
         tkt_id => 104
        ,description => 'Trouble Ticket 104'
        ,submit_dts => '2009-01-14 12:30:00'
        ,status => 'OPEN'
        ,docFileName => 'New_104.doc'
        ,imgFileName => 'DBRIssues.jpg'
   );

    trbtkt.pkg_securefiles.AddTroubleTicket (
         tkt_id => 105
        ,description => 'Trouble Ticket 105'
        ,submit_dts => '2009-01-09 00:00:00'
        ,status => 'OPEN'
        ,docFileName => 'New_105.doc'
        ,imgFileName => 'Unresolved.jpg'
    );

    trbtkt.pkg_securefiles.AddTroubleTicket (
         tkt_id => 106
        ,description => 'Trouble Ticket 106'
        ,submit_dts => '2009-01-11 00:00:00'
        ,status => 'OPEN'
        ,docFileName => 'New_106.doc'
        ,imgFileName => 'Unresolved.jpg'
    );
    
    trbtkt.pkg_securefiles.AddTroubleTicket (
         tkt_id => 107
        ,description => 'Trouble Ticket 107'
        ,submit_dts => '2009-01-16 00:00:00'
        ,status => 'OPEN'
        ,docFileName => 'New_107.doc'
        ,imgFileName => 'DBRIssues.jpg'
    );
    
    trbtkt.pkg_securefiles.AddTroubleTicket (
         tkt_id => 108
        ,description => 'Trouble Ticket 108'
        ,submit_dts => '2009-01-12 00:00:00'
        ,status => 'OPEN'
        ,docFileName => 'New_108.doc'
        ,imgFileName => 'Unresolved.jpg'
    );
    
    trbtkt.pkg_securefiles.AddTroubleTicket (
         tkt_id => 109
        ,description => 'Trouble Ticket 109'
        ,submit_dts => '2009-01-02 00:00:00'
        ,status => 'OPEN'
        ,docFileName => 'New_109.doc'
        ,imgFileName => 'Unresolved.jpg'
     );

    trbtkt.pkg_securefiles.AddTroubleTicket (
         tkt_id => 110
        ,description => 'Trouble Ticket 110'
        ,submit_dts => '2009-01-14 12:45:00'
        ,status => 'OPEN'
        ,docFileName => 'New_110.doc'
        ,imgFileName => 'DBRIssues.jpg'
   );

    trbtkt.pkg_securefiles.AddTroubleTicket (
         tkt_id => 201
        ,description => 'Trouble Ticket 201'
        ,submit_dts => '2008-12-31 23:45:00'
        ,status => 'PENDING'
        ,docFileName => 'New_101.doc'
        ,imgFileName => 'DBRIssues.jpg'
    );

    trbtkt.pkg_securefiles.AddTroubleTicket (
         tkt_id => 202
        ,description => 'Trouble Ticket 202'
        ,submit_dts => '2009-01-04 00:00:00'
        ,status => 'OPEN'
        ,docFileName => 'New_102.doc'
        ,imgFileName => 'Unresolved.jpg'
    );

    trbtkt.pkg_securefiles.AddTroubleTicket (
         tkt_id => 203
        ,description => 'Trouble Ticket 203'
        ,submit_dts => '2009-01-02 00:00:00'
        ,status => 'CLOSED'
        ,docFileName => 'New_103.doc'
        ,imgFileName => 'Unresolved.jpg'
     );

    trbtkt.pkg_securefiles.AddTroubleTicket (
         tkt_id => 204
        ,description => 'Trouble Ticket 204'
        ,submit_dts => '2009-01-14 12:30:00'
        ,status => 'OPEN'
        ,docFileName => 'New_104.doc'
        ,imgFileName => 'DBRIssues.jpg'
   );

    trbtkt.pkg_securefiles.AddTroubleTicket (
         tkt_id => 205
        ,description => 'Trouble Ticket 205'
        ,submit_dts => '2009-01-09 00:00:00'
        ,status => 'OPEN'
        ,docFileName => 'New_105.doc'
        ,imgFileName => 'Unresolved.jpg'
    );

    trbtkt.pkg_securefiles.AddTroubleTicket (
         tkt_id => 206
        ,description => 'Trouble Ticket 206'
        ,submit_dts => '2009-01-11 00:00:00'
        ,status => 'PENDING'
        ,docFileName => 'New_106.doc'
        ,imgFileName => 'Unresolved.jpg'
    );
    
    trbtkt.pkg_securefiles.AddTroubleTicket (
         tkt_id => 207
        ,description => 'Trouble Ticket 207'
        ,submit_dts => '2009-01-16 00:00:00'
        ,status => 'OPEN'
        ,docFileName => 'New_107.doc'
        ,imgFileName => 'DBRIssues.jpg'
    );
    
    trbtkt.pkg_securefiles.AddTroubleTicket (
         tkt_id => 208
        ,description => 'Trouble Ticket 208'
        ,submit_dts => '2009-01-12 00:00:00'
        ,status => 'OPEN'
        ,docFileName => 'New_108.doc'
        ,imgFileName => 'Unresolved.jpg'
    );
    
    trbtkt.pkg_securefiles.AddTroubleTicket (
         tkt_id => 209
        ,description => 'Trouble Ticket 209'
        ,submit_dts => '2009-01-02 00:00:00'
        ,status => 'PENDING'
        ,docFileName => 'New_109.doc'
        ,imgFileName => 'Unresolved.jpg'
     );

    trbtkt.pkg_securefiles.AddTroubleTicket (
         tkt_id => 210
        ,description => 'Trouble Ticket 210'
        ,submit_dts => '2009-01-14 12:45:00'
        ,status => 'OPEN'
        ,docFileName => 'New_110.doc'
        ,imgFileName => 'DBRIssues.jpg'
   );

    trbtkt.pkg_securefiles.AddTroubleTicket (
         tkt_id => 301
        ,description => 'Trouble Ticket 301'
        ,submit_dts => '2008-12-31 23:45:00'
        ,status => 'CLOSED'
        ,docFileName => 'New_101.doc'
        ,imgFileName => 'DBRIssues.jpg'
    );

    trbtkt.pkg_securefiles.AddTroubleTicket (
         tkt_id => 302
        ,description => 'Trouble Ticket 302'
        ,submit_dts => '2009-01-04 00:00:00'
        ,status => 'OPEN'
        ,docFileName => 'New_102.doc'
        ,imgFileName => 'Unresolved.jpg'
    );

    trbtkt.pkg_securefiles.AddTroubleTicket (
         tkt_id => 303
        ,description => 'Trouble Ticket 303'
        ,submit_dts => '2009-01-02 00:00:00'
        ,status => 'OPEN'
        ,docFileName => 'New_103.doc'
        ,imgFileName => 'Unresolved.jpg'
     );

    trbtkt.pkg_securefiles.AddTroubleTicket (
         tkt_id => 304
        ,description => 'Trouble Ticket 304'
        ,submit_dts => '2009-01-14 12:30:00'
        ,status => 'CLOSED'
        ,docFileName => 'New_104.doc'
        ,imgFileName => 'DBRIssues.jpg'
   );

    trbtkt.pkg_securefiles.AddTroubleTicket (
         tkt_id => 305
        ,description => 'Trouble Ticket 305'
        ,submit_dts => '2009-01-09 00:00:00'
        ,status => 'PENDING'
        ,docFileName => 'New_105.doc'
        ,imgFileName => 'Unresolved.jpg'
    );

    trbtkt.pkg_securefiles.AddTroubleTicket (
         tkt_id => 306
        ,description => 'Trouble Ticket 306'
        ,submit_dts => '2009-01-11 00:00:00'
        ,status => 'CLOSED'
        ,docFileName => 'New_106.doc'
        ,imgFileName => 'Unresolved.jpg'
    );
    
    trbtkt.pkg_securefiles.AddTroubleTicket (
         tkt_id => 307
        ,description => 'Trouble Ticket 307'
        ,submit_dts => '2009-01-16 00:00:00'
        ,status => 'OPEN'
        ,docFileName => 'New_107.doc'
        ,imgFileName => 'DBRIssues.jpg'
    );
    
    trbtkt.pkg_securefiles.AddTroubleTicket (
         tkt_id => 308
        ,description => 'Trouble Ticket 308'
        ,submit_dts => '2009-01-12 00:00:00'
        ,status => 'OPEN'
        ,docFileName => 'New_108.doc'
        ,imgFileName => 'Unresolved.jpg'
    );
    
    trbtkt.pkg_securefiles.AddTroubleTicket (
         tkt_id => 309
        ,description => 'Trouble Ticket 309'
        ,submit_dts => '2009-01-02 00:00:00'
        ,status => 'CLOSED'
        ,docFileName => 'New_109.doc'
        ,imgFileName => 'Unresolved.jpg'
     );

    trbtkt.pkg_securefiles.AddTroubleTicket (
         tkt_id => 310
        ,description => 'Trouble Ticket 310'
        ,submit_dts => '2009-01-14 12:45:00'
        ,status => 'CLOSED'
        ,docFileName => 'New_110.doc'
        ,imgFileName => 'DBRIssues.jpg'
   );

    COMMIT;
   
END;
/
-- 收集優化器統計信息
BEGIN
    DBMS_STATS.GATHER_SCHEMA_STATS(ownname => 'TRBTKT', CASCADE => TRUE);
END;

/

有效地從BasicFile移植到SecureFile

　　現在已經將這些表進行了分區，以便在數據倉庫環境更有效地使用，我也已經考慮過如何將LOB從BasicFile格式快速有效地轉換成對應的SecureFile格式，幸運的是，Oracle 11g提供了兩個方法：分區交換和在線重定義。

　　1、分區交換

　　分區交換載入(Partition Exchange Load，即PDL)有時也叫做分區轉動，包含創建一個非分區表，它的格式和內容完全匹配目標分區表想要的分區，一旦原始表創建好了，就可以開始可已經分區的表的目標分區進行交換了，這個方法確實提供了許多好處，換句話說，原始表的本地索引在交換期間得到維護，它可以並行執行，這個方法可以重複多次以填充每個分區，它的主要缺點是接收數據的分區在進行交換時必須離線。

　　2、在線重定義

　　Oracle推薦使用DBMS_REDEFINITION包對源表和目標表執行在線重定義，因爲它實現了分區交換方法相同的目標。但它不需要在重定義過程中將目標離線。在線重定義可以在表級也可以在分區級執行，它也可以同時並行爲多個分區執行，我喜歡在線重定義的特性是在這個過程成功執行完畢後，源和目標對象將對真正地在數據庫數據目錄中轉換定義，這意味着任何引用了新對象名的PL/SQL對象都不需要進行任何修改。清單3顯示瞭如何使用TRBTKT.TICKETS表作爲源對象，使用TRBTKT.SECURE_TICKETS表作爲目標對象進行在線重定義的。從BasicFile LOB轉換到SecureFile LOB最後一個注意事項是：一旦轉換完成，LOB就不能再降級回到BasicFile LOB了。

　　管理SecureFile元數據

　　這些新的SecureFile特性無疑擴展了LOB的能力，對於DBA而言，也需要注意幾個在傳統的BasicFile LOB上增加的額外屬性，幸運的是，Oracle 11g提供了多個方法跟蹤BasicFile和SecureFile LOB的元數據。

　　1、數據字典視圖

　　Oracle 11g也更新了多個關於SecureFile信息的數據字典視圖，下面列出這些做了變動的視圖。 

　　清單4顯示了多條SQL*Plus查詢，它們使用了這些數據字典視圖返回關於SecureFile元數據的信息，報告1顯示了從這些查詢返回的結果。

　　清單4 查詢BasicFile和SecureFile LOB的元數據

SET PAGESIZE 1000
SET LINESIZE 140 
-- 視圖: DBA_SEGMENTS
--顯示關於BasicFile 和SecureFile 段的元數據
TTITLE 'LOB Segment Information|(from DBA_SEGMENTS)'
COL segment_name        FORMAT A30      HEADING 'Segment Name'
COL segment_type        FORMAT A20      HEADING 'Segment|Type'
COL segment_subtype     FORMAT A20      HEADING 'Segment|SubType'
COL partition_name      FORMAT A12      HEADING 'Partition|Name'
COL tablespace_name     FORMAT A12      HEADING 'Tablespace'
SELECT 
    segment_name
   ,segment_type
   ,segment_subtype
   ,partition_name
   ,tablespace_name
  FROM dba_segments
WHERE owner = 'TRBTKT'
ORDER BY segment_name
;
TTITLE OFF
-- 視圖: DBA_LOBS
--顯示關於BasicFile和SecureFile LOB的元數據
TTITLE 'BasicFile and SecureFile LOBs Metadata|(from DBA_LOBS)'
COL table_name      FORMAT A14      HEADING 'Table'
COL segment_name    FORMAT A26      HEADING 'Segment'
COL column_name     FORMAT A10      HEADING 'Column'
COL tablespace_name FORMAT A12      HEADING 'Tablespace'
COL logging         FORMAT A08      HEADING 'Logging'
COL cache           FORMAT A10      HEADING 'Cacheing'
COL in_row          FORMAT A07      HEADING 'Stored|In Row'
COL encrypt         FORMAT A07      HEADING 'Encryp-|tion'
COL compression     FORMAT A07      HEADING 'Compre-|ssion'
COL deduplication   FORMAT A08      HEADING 'DeDupli-|cation'
COL securefile      FORMAT A07      HEADING 'Secure|File?'
COL partitioned     FORMAT A07      HEADING 'Parti-|tioned'
SELECT
    table_name
   ,column_name
   ,segment_name
   ,tablespace_name
   ,logging
   ,cache
   ,in_row
   ,encrypt
   ,compression
   ,deduplication
   ,securefile
   ,partitioned
  FROM dba_lobs
WHERE owner = 'TRBTKT'
ORDER BY table_name, column_name
;
TTITLE OFF
--視圖: DBA_PART_LOBS
--顯示BasicFile和SecureFile LOB的默認值
TTITLE 'BasicFile and SecureFile Partitioned LOB Default Settings|(from DBA_PART_LOBS)'
COL table_name          FORMAT A20      HEADING 'Table'
COL column_name         FORMAT A12      HEADING 'Column'
COL def_cache           FORMAT A12      HEADING 'Cached'
COL def_tablespace_name FORMAT A12      HEADING 'Tablespace'
COL def_securefile      FORMAT A12      HEADING 'SecureFile'
COL def_encrypt         FORMAT A12      HEADING 'Encrypted'
COL def_compress        FORMAT A12      HEADING 'Compressed'
COL def_deduplicate     FORMAT A12      HEADING 'DeDuplicated'
SELECT
    table_name
   ,column_name
   ,def_cache
   ,def_tablespace_name
   ,def_securefile
   ,def_compress
   ,def_deduplicate
   ,def_encrypt
  FROM dba_part_lobs
WHERE table_owner = 'TRBTKT'
ORDER BY table_name, column_name
;
TTITLE OFF
--視圖: DBA_LOB_PARTITIONS
--在獨立的LOB級描述BasicFile和SecureFile設置
TTITLE 'BasicFile and SecureFile LOB Partitions|(from DBA_LOB_PARTITIONS)'
COL table_name      FORMAT A16      HEADING 'Table'
COL column_name     FORMAT A12      HEADING 'Column'
COL partition_name  FORMAT A12      HEADING 'Stored in|Partition'
COL cache           FORMAT A10      HEADING 'Cacheing'
COL in_row          FORMAT A10      HEADING 'Stored|In Row'
COL encrypt         FORMAT A10      HEADING 'Encrypted'
COL compression     FORMAT A10      HEADING 'Compressed'
COL deduplication   FORMAT A10      HEADING 'DeDupli-|cated'
COL securefile      FORMAT A10      HEADING 'SecureFile?'
SELECT
    table_name
   ,column_name
   ,partition_name
   ,cache
   ,in_row
   ,encrypt
   ,compression
   ,deduplication
   ,securefile
  FROM dba_lob_partitions
WHERE table_owner = 'TRBTKT'
ORDER BY table_name, column_name
;
TTITLE OFF

報告1 從BasicFIle和SecureFile LOB元數據報告返回的結果

SET PAGESIZE 1000
SET LINESIZE 140 
-- 視圖: DBA_SEGMENTS
--顯示關於BasicFile 和SecureFile 段的元數據
TTITLE 'LOB Segment Information|(from DBA_SEGMENTS)'
COL segment_name        FORMAT A30      HEADING 'Segment Name'
COL segment_type        FORMAT A20      HEADING 'Segment|Type'
COL segment_subtype     FORMAT A20      HEADING 'Segment|SubType'
COL partition_name      FORMAT A12      HEADING 'Partition|Name'
COL tablespace_name     FORMAT A12      HEADING 'Tablespace'
SELECT 
    segment_name
   ,segment_type
   ,segment_subtype
   ,partition_name
   ,tablespace_name
  FROM dba_segments
WHERE owner = 'TRBTKT'
ORDER BY segment_name
;
TTITLE OFF
-- 視圖: DBA_LOBS
--顯示關於BasicFile和SecureFile LOB的元數據
TTITLE 'BasicFile and SecureFile LOBs Metadata|(from DBA_LOBS)'
COL table_name      FORMAT A14      HEADING 'Table'
COL segment_name    FORMAT A26      HEADING 'Segment'
COL column_name     FORMAT A10      HEADING 'Column'
COL tablespace_name FORMAT A12      HEADING 'Tablespace'
COL logging         FORMAT A08      HEADING 'Logging'
COL cache           FORMAT A10      HEADING 'Cacheing'
COL in_row          FORMAT A07      HEADING 'Stored|In Row'
COL encrypt         FORMAT A07      HEADING 'Encryp-|tion'
COL compression     FORMAT A07      HEADING 'Compre-|ssion'
COL deduplication   FORMAT A08      HEADING 'DeDupli-|cation'
COL securefile      FORMAT A07      HEADING 'Secure|File?'
COL partitioned     FORMAT A07      HEADING 'Parti-|tioned'
SELECT
    table_name
   ,column_name
   ,segment_name
   ,tablespace_name
   ,logging
   ,cache
   ,in_row
   ,encrypt
   ,compression
   ,deduplication
   ,securefile
   ,partitioned
  FROM dba_lobs
WHERE owner = 'TRBTKT'
ORDER BY table_name, column_name
;
TTITLE OFF
--視圖: DBA_PART_LOBS
--顯示BasicFile和SecureFile LOB的默認值
TTITLE 'BasicFile and SecureFile Partitioned LOB Default Settings|(from DBA_PART_LOBS)'
COL table_name          FORMAT A20      HEADING 'Table'
COL column_name         FORMAT A12      HEADING 'Column'
COL def_cache           FORMAT A12      HEADING 'Cached'
COL def_tablespace_name FORMAT A12      HEADING 'Tablespace'
COL def_securefile      FORMAT A12      HEADING 'SecureFile'
COL def_encrypt         FORMAT A12      HEADING 'Encrypted'
COL def_compress        FORMAT A12      HEADING 'Compressed'
COL def_deduplicate     FORMAT A12      HEADING 'DeDuplicated'
SELECT
    table_name
   ,column_name
   ,def_cache
   ,def_tablespace_name
   ,def_securefile
   ,def_compress
   ,def_deduplicate
   ,def_encrypt
  FROM dba_part_lobs
WHERE table_owner = 'TRBTKT'
ORDER BY table_name, column_name
;
TTITLE OFF
--視圖: DBA_LOB_PARTITIONS
--在獨立的LOB級描述BasicFile和SecureFile設置
TTITLE 'BasicFile and SecureFile LOB Partitions|(from DBA_LOB_PARTITIONS)'
COL table_name      FORMAT A16      HEADING 'Table'
COL column_name     FORMAT A12      HEADING 'Column'
COL partition_name  FORMAT A12      HEADING 'Stored in|Partition'
COL cache           FORMAT A10      HEADING 'Cacheing'
COL in_row          FORMAT A10      HEADING 'Stored|In Row'
COL encrypt         FORMAT A10      HEADING 'Encrypted'
COL compression     FORMAT A10      HEADING 'Compressed'
COL deduplication   FORMAT A10      HEADING 'DeDupli-|cated'
COL securefile      FORMAT A10      HEADING 'SecureFile?'
SELECT
    table_name
   ,column_name
   ,partition_name
   ,cache
   ,in_row
   ,encrypt
   ,compression
   ,deduplication
   ,securefile
  FROM dba_lob_partitions
WHERE table_owner = 'TRBTKT'
ORDER BY table_name, column_name
;
TTITLE OFF
報告1 從BasicFIle和SecureFile LOB元數據報告返回的結果
LOB段信息
                                                            (來自DBA_SEGMENTS)

                               Segment              Segment              Partition                                                          
Segment Name                   Type                 SubType              Name         Tablespace                                            
------------------------- -------------------- -------------------- ------------ ------------                                          
SECURE_TICKETS                 TABLE PARTITION      ASSM                 STS_PENDING  USERS                                                 
SECURE_TICKETS                 TABLE PARTITION      ASSM                 STS_CLOSED   USERS                                                 
SECURE_TICKETS                 TABLE PARTITION      ASSM                 STS_OPEN     USERS                                                 
SECURE_TICKETS                 TABLE PARTITION      ASSM                 STS_OTHER    USERS                                                 
SYS_IL0000072118C00005$$       INDEX PARTITION      ASSM                 SYS_IL_P180  BASICFILES                                            
SYS_IL0000072118C00005$$       INDEX PARTITION      ASSM                 SYS_IL_P179  BASICFILES                                            
SYS_IL0000072118C00005$$       INDEX PARTITION      ASSM                 SYS_IL_P178  BASICFILES                                            
SYS_IL0000072118C00005$$       INDEX PARTITION      ASSM                 SYS_IL_P177  BASICFILES                                            
SYS_IL0000072118C00006$$       INDEX PARTITION      ASSM                 SYS_IL_P185  BASICFILES                                            
SYS_IL0000072118C00006$$       INDEX PARTITION      ASSM                 SYS_IL_P188  BASICFILES                                            
SYS_IL0000072118C00006$$       INDEX PARTITION      ASSM                 SYS_IL_P187  BASICFILES                                            
SYS_IL0000072118C00006$$       INDEX PARTITION      ASSM                 SYS_IL_P186  BASICFILES                                            
SYS_IL0000072144C00005$$       INDEX PARTITION      ASSM                 SYS_IL_P194  SECUREFILES                                           
SYS_IL0000072144C00005$$       INDEX PARTITION      ASSM                 SYS_IL_P193  SECUREFILES                                           
SYS_IL0000072144C00005$$       INDEX PARTITION      ASSM                 SYS_IL_P195  SECUREFILES                                           
SYS_IL0000072144C00005$$       INDEX PARTITION      ASSM                 SYS_IL_P196  SECUREFILES                                           
SYS_IL0000072144C00006$$       INDEX PARTITION      ASSM                 SYS_IL_P204  SECUREFILES                                           
SYS_IL0000072144C00006$$       INDEX PARTITION      ASSM                 SYS_IL_P203  SECUREFILES                                           
SYS_IL0000072144C00006$$       INDEX PARTITION      ASSM                 SYS_IL_P202  SECUREFILES                                           
SYS_IL0000072144C00006$$       INDEX PARTITION      ASSM                 SYS_IL_P201  SECUREFILES                                           
SYS_LOB0000072118C00005$$      LOB PARTITION        ASSM                 SYS_LOB_P173 BASICFILES                                            
SYS_LOB0000072118C00005$$      LOB PARTITION        ASSM                 SYS_LOB_P176 BASICFILES                                            
SYS_LOB0000072118C00005$$      LOB PARTITION        ASSM                 SYS_LOB_P175 BASICFILES                                            
SYS_LOB0000072118C00005$$      LOB PARTITION        ASSM                 SYS_LOB_P174 BASICFILES                                            
SYS_LOB0000072118C00006$$      LOB PARTITION        ASSM                 SYS_LOB_P184 BASICFILES                                            
SYS_LOB0000072118C00006$$      LOB PARTITION        ASSM                 SYS_LOB_P183 BASICFILES                                            
SYS_LOB0000072118C00006$$      LOB PARTITION        ASSM                 SYS_LOB_P181 BASICFILES                                            
SYS_LOB0000072118C00006$$      LOB PARTITION        ASSM                 SYS_LOB_P182 BASICFILES                                            
SYS_LOB0000072144C00005$$      LOB PARTITION        SECUREFILE           SYS_LOB_P191 SECUREFILES                                           
SYS_LOB0000072144C00005$$      LOB PARTITION        SECUREFILE           SYS_LOB_P192 SECUREFILES                                           
SYS_LOB0000072144C00005$$      LOB PARTITION        SECUREFILE           SYS_LOB_P189 SECUREFILES                                           
SYS_LOB0000072144C00005$$      LOB PARTITION        SECUREFILE           SYS_LOB_P190 SECUREFILES                                           
SYS_LOB0000072144C00006$$      LOB PARTITION        SECUREFILE           SYS_LOB_P198 SECUREFILES                                           
SYS_LOB0000072144C00006$$      LOB PARTITION        SECUREFILE           SYS_LOB_P199 SECUREFILES                                           
SYS_LOB0000072144C00006$$      LOB PARTITION        SECUREFILE           SYS_LOB_P197 SECUREFILES                                           
SYS_LOB0000072144C00006$$      LOB PARTITION        SECUREFILE           SYS_LOB_P200 SECUREFILES                                           
TICKETS                        TABLE PARTITION      ASSM                 STS_PENDING  USERS                                                 
TICKETS                        TABLE PARTITION      ASSM                 STS_OTHER    USERS                                                 
TICKETS                        TABLE PARTITION      ASSM                 STS_OPEN     USERS                                                 
TICKETS                        TABLE PARTITION      ASSM                 STS_CLOSED   USERS                                                 
TICKETS_PK_IDX                 INDEX                ASSM                              USERS                                                 

                                                   BasicFile和SecureFile LOB元數據
                                                              (來自DBA_LOBS)

                                                                                      Stored  Encryp- Compre- DeDupli- Secure  Parti-       
Table          Column     Segment                    Tablespace   Logging  Cacheing   In Row  tion    ssion   cation   File?   tioned       
-------------- ---------- -------------------------- ------------ -------- ---------- ------- ------- ------- -------- ------- -------      
SECURE_TICKETS DOCUMENT   SYS_LOB0000072118C00005$$  BASICFILES   NONE     NO         YES     NONE    NONE    NONE     NO      YES          
SECURE_TICKETS SCRNIMG    SYS_LOB0000072118C00006$$  BASICFILES   NONE     NO         YES     NONE    NONE    NONE     NO      YES          
TICKETS        DOCUMENT   SYS_LOB0000072144C00005$$  SECUREFILES  NONE     YES        NO      NO      NO      NO       YES     YES          
TICKETS        SCRNIMG    SYS_LOB0000072144C00006$$  SECUREFILES  NONE     CACHEREADS NO      NO      NO      NO       YES     YES          

                                         BasicFile和SecureFile分區LOB默認設置
                                                            (來自DBA_PART_LOBS)

Table     Column       Cached       Tablespace   SecureFile   Compressed   DeDuplicated Encrypted                                
----- ------------ ------------ ------------ ------------ ------------ ------------ ------------                             
SECURE_TICKETS     DOCUMENT     NO           BASICFILES   NO           NONE         NONE         NONE                                     
SECURE_TICKETS     SCRNIMG      NO           BASICFILES   NO           NONE         NONE         NONE                                     
TICKETS              DOCUMENT     YES          SECUREFILES  YES          NO           NO           NO                                       
TICKETS              SCRNIMG      CACHEREADS   SECUREFILES  YES          NO           NO           NO                                       

                                                  BasicFile和SecureFile LOB分區
                                                         (來自DBA_LOB_PARTITIONS)

                              Stored in               Stored                           DeDupli-                                             
Table    Column     Partition    Cacheing   In Row     Encrypted  Compressed cated      SecureFile                                
---- ------------ ------------ ---------- ---------- ---------- ---------- ---------- ----------                                
SECURE_TICKETS   DOCUMENT     STS_OTHER    NO         YES        NONE       NONE       NONE       NO                                        
SECURE_TICKETS   DOCUMENT     STS_CLOSED   NO         YES        NONE       NONE       NONE       NO                                        
SECURE_TICKETS   DOCUMENT     STS_OPEN     NO         YES        NONE       NONE       NONE       NO                                        
SECURE_TICKETS   DOCUMENT     STS_PENDING  NO         YES        NONE       NONE       NONE       NO                                        
SECURE_TICKETS   SCRNIMG      STS_OTHER    NO         YES        NONE       NONE       NONE       NO                                        
SECURE_TICKETS   SCRNIMG      STS_CLOSED   NO         YES        NONE       NONE       NONE       NO                                        
SECURE_TICKETS   SCRNIMG      STS_PENDING  NO         YES        NONE       NONE       NONE       NO                                        
SECURE_TICKETS   SCRNIMG      STS_OPEN     NO         YES        NONE       NONE       NONE       NO                                        
TICKETS          DOCUMENT     STS_OTHER    YES        NO         NO         HIGH       LOB        YES                                       
TICKETS          DOCUMENT     STS_PENDING  YES        NO         NO         NO         NO         YES                                       
TICKETS          DOCUMENT     STS_CLOSED   YES        NO         NO         MEDIUM     LOB        YES                                       
TICKETS          DOCUMENT     STS_OPEN     YES        NO         NO         NO         NO         YES                                       
TICKETS          SCRNIMG      STS_PENDING  CACHEREADS NO         NO         MEDIUM     LOB        YES                                       
TICKETS          SCRNIMG      STS_OPEN     CACHEREADS NO         NO         MEDIUM     NO         YES                                       
TICKETS          SCRNIMG      STS_CLOSED   CACHEREADS NO         NO         HIGH       LOB        YES                                       
TICKETS          SCRNIMG      STS_OTHER    CACHEREADS NO         NO         HIGH       LOB        YES

　2、DBMS_SPACE

　　這是另一個Oracle古老支持包，它的SPACE_USAGE存儲過程提供關於BasicFile和SecureFile LOB的空間利用率，我在TRBTKT.PKG_SECUREFILES包中引入了兩個存儲過程：CALC_SPACE_BASICFILES和CALC_SPACE_SECUREFILES。但遺憾的是，這個功能只能在啓用了自動段空間管理(ASSM)的表空間上使用，而且，它也不會考慮任何BasicFile LOB塊的空間利用率，在清單5中，我對錶TRBTKT.TICKETS和TRBTKT.SECURE_TICKETS分別調用了這些存儲過程，並返回了相應的輸出。

　　清單5 確定BasicFile和SecureFile LOB的空間利用率

SET SERVEROUTPUT ON
-- BasicFile存儲利用率:
BEGIN
    trbtkt.pkg_securefiles.calc_space_basicfiles (
         ownname => 'TRBTKT'
        ,tabname => 'SECURE_TICKETS'
        ,colname => 'DOCUMENT'
        ,partname => 'STS_OPEN'
    );
    trbtkt.pkg_securefiles.calc_space_basicfiles (
         ownname => 'TRBTKT'
        ,tabname => 'SECURE_TICKETS'
        ,colname => 'DOCUMENT'
        ,partname => 'STS_PENDING'
    );
    trbtkt.pkg_securefiles.calc_space_basicfiles (
         ownname => 'TRBTKT'
        ,tabname => 'SECURE_TICKETS'
        ,colname => 'DOCUMENT'
        ,partname => 'STS_CLOSED'
    );
    trbtkt.pkg_securefiles.calc_space_basicfiles (
         ownname => 'TRBTKT'
        ,tabname => 'SECURE_TICKETS'
        ,colname => 'DOCUMENT'
        ,partname => 'STS_OTHER'
    );
    trbtkt.pkg_securefiles.calc_space_basicfiles (
         ownname => 'TRBTKT'
        ,tabname => 'SECURE_TICKETS'
        ,colname => 'SCRNIMG'
        ,partname => 'STS_OPEN'
    );
    trbtkt.pkg_securefiles.calc_space_basicfiles (
         ownname => 'TRBTKT'
        ,tabname => 'SECURE_TICKETS'
        ,colname => 'SCRNIMG'
        ,partname => 'STS_PENDING'
    );
    trbtkt.pkg_securefiles.calc_space_basicfiles (
         ownname => 'TRBTKT'
        ,tabname => 'SECURE_TICKETS'
        ,colname => 'SCRNIMG'
        ,partname => 'STS_CLOSED'
    );
    trbtkt.pkg_securefiles.calc_space_basicfiles (
         ownname => 'TRBTKT'
        ,tabname => 'SECURE_TICKETS'
        ,colname => 'SCRNIMG'
        ,partname => 'STS_OTHER'
    );
END;
/
============================================================
Space Usage for BasicFile LOB TRBTKT.SECURE_TICKETS.DOCUMENT
Partition Name: STS_OPEN                                    
------------------------------------------------------------
Full Blocks: 123 KB: .96                                    
Unformatted Blocks: 379 KB: 2.96                            
Total Blocks: 123 Total KB: .96                             
============================================================
============================================================
Space Usage for BasicFile LOB TRBTKT.SECURE_TICKETS.DOCUMENT
Partition Name: STS_PENDING                                 
------------------------------------------------------------
Full Blocks: 20 KB: .16                                     
Unformatted Blocks: 482 KB: 3.77                            
Total Blocks: 20 Total KB: .16                              
============================================================
============================================================
Space Usage for BasicFile LOB TRBTKT.SECURE_TICKETS.DOCUMENT
Partition Name: STS_CLOSED                                  
------------------------------------------------------------
Full Blocks: 37 KB: .29                                     
Unformatted Blocks: 465 KB: 3.63                            
Total Blocks: 37 Total KB: .29                              
============================================================
============================================================
Space Usage for BasicFile LOB TRBTKT.SECURE_TICKETS.DOCUMENT
Partition Name: STS_OTHER                                   
------------------------------------------------------------
Full Blocks: 0 KB: 0                                        
Unformatted Blocks: 0 KB: 0                                 
Total Blocks: 0 Total KB: 0                                 
============================================================
============================================================
Space Usage for BasicFile LOB TRBTKT.SECURE_TICKETS.SCRNIMG 
Partition Name: STS_OPEN                                    
------------------------------------------------------------
Full Blocks: 420 KB: 3.28                                   
Unformatted Blocks: 82 KB: .64                              
Total Blocks: 420 Total KB: 3.28                            
============================================================
============================================================
Space Usage for BasicFile LOB TRBTKT.SECURE_TICKETS.SCRNIMG 
Partition Name: STS_PENDING                                 
------------------------------------------------------------
Full Blocks: 66 KB: .52                                     
Unformatted Blocks: 436 KB: 3.41                            
Total Blocks: 66 Total KB: .52                              
============================================================
============================================================
Space Usage for BasicFile LOB TRBTKT.SECURE_TICKETS.SCRNIMG 
Partition Name: STS_CLOSED                                  
------------------------------------------------------------
Full Blocks: 144 KB: 1.13                                   
Unformatted Blocks: 358 KB: 2.8                             
Total Blocks: 144 Total KB: 1.13                            
============================================================
============================================================
Space Usage for BasicFile LOB TRBTKT.SECURE_TICKETS.SCRNIMG 
Partition Name: STS_OTHER                                   
------------------------------------------------------------
Full Blocks: 0 KB: 0                                        
Unformatted Blocks: 0 KB: 0                                 
Total Blocks: 0 Total KB: 0                                 
============================================================
-- SecureFile存儲利用率:
BEGIN
    trbtkt.pkg_securefiles.calc_space_securefiles (
         ownname => 'TRBTKT'
        ,tabname => 'TICKETS'
        ,colname => 'DOCUMENT'
        ,partname => 'STS_OPEN'
    );
    trbtkt.pkg_securefiles.calc_space_securefiles (
         ownname => 'TRBTKT'
        ,tabname => 'TICKETS'
        ,colname => 'DOCUMENT'
        ,partname => 'STS_PENDING'
    );
    trbtkt.pkg_securefiles.calc_space_securefiles (
         ownname => 'TRBTKT'
        ,tabname => 'TICKETS'
        ,colname => 'DOCUMENT'
        ,partname => 'STS_CLOSED'
    );
    trbtkt.pkg_securefiles.calc_space_securefiles (
         ownname => 'TRBTKT'
        ,tabname => 'TICKETS'
        ,colname => 'DOCUMENT'
        ,partname => 'STS_OTHER'
    );
    trbtkt.pkg_securefiles.calc_space_securefiles (
         ownname => 'TRBTKT'
        ,tabname => 'TICKETS'
        ,colname => 'SCRNIMG'
        ,partname => 'STS_OPEN'
    );
    trbtkt.pkg_securefiles.calc_space_securefiles (
         ownname => 'TRBTKT'
        ,tabname => 'TICKETS'
        ,colname => 'SCRNIMG'
        ,partname => 'STS_PENDING'
    );
    trbtkt.pkg_securefiles.calc_space_securefiles (
         ownname => 'TRBTKT'
        ,tabname => 'TICKETS'
        ,colname => 'SCRNIMG'
        ,partname => 'STS_CLOSED'
    );
    trbtkt.pkg_securefiles.calc_space_securefiles (
         ownname => 'TRBTKT'
        ,tabname => 'TICKETS'
        ,colname => 'SCRNIMG'
        ,partname => 'STS_OTHER'
    );
END;
/

============================================================
Space Usage for SecureFile LOB TRBTKT.TICKETS.DOCUMENT      
Partition Name: STS_OPEN                                    
------------------------------------------------------------
Segment Blocks: 1024 KB: 8192                               
Used Blocks: 124 KB: 992                                    
Expired Blocks: 882 KB: 7056                                
Unexpired Blocks: 0 KB: 0                                   
============================================================
============================================================
Space Usage for SecureFile LOB TRBTKT.TICKETS.DOCUMENT      
Partition Name: STS_PENDING                                 
------------------------------------------------------------
Segment Blocks: 1024 KB: 8192                               
Used Blocks: 21 KB: 168                                     
Expired Blocks: 985 KB: 7880                                
Unexpired Blocks: 0 KB: 0                                   
============================================================
============================================================
Space Usage for SecureFile LOB TRBTKT.TICKETS.DOCUMENT      
Partition Name: STS_CLOSED                                  
------------------------------------------------------------
Segment Blocks: 1024 KB: 8192                               
Used Blocks: 13 KB: 104                                     
Expired Blocks: 993 KB: 7944                                
Unexpired Blocks: 0 KB: 0                                   
============================================================
============================================================
Space Usage for SecureFile LOB TRBTKT.TICKETS.DOCUMENT      
Partition Name: STS_OTHER                                   
------------------------------------------------------------
Segment Blocks: 512 KB: 4096                                
Used Blocks: 501 KB: 4008                                   
Expired Blocks: 0 KB: 0                                     
Unexpired Blocks: 0 KB: 0                                   
============================================================
============================================================
Space Usage for SecureFile LOB TRBTKT.TICKETS.SCRNIMG       
Partition Name: STS_OPEN                                    
------------------------------------------------------------
Segment Blocks: 2560 KB: 20480                              
Used Blocks: 405 KB: 3240                                   
Expired Blocks: 2134 KB: 17072                              
Unexpired Blocks: 0 KB: 0                                   
============================================================
============================================================
Space Usage for SecureFile LOB TRBTKT.TICKETS.SCRNIMG       
Partition Name: STS_PENDING                                 
------------------------------------------------------------
Segment Blocks: 1024 KB: 8192                               
Used Blocks: 62 KB: 496                                     
Expired Blocks: 944 KB: 7552                                
Unexpired Blocks: 0 KB: 0                                   
============================================================
============================================================
Space Usage for SecureFile LOB TRBTKT.TICKETS.SCRNIMG       
Partition Name: STS_CLOSED                                  
------------------------------------------------------------
Segment Blocks: 1024 KB: 8192                               
Used Blocks: 142 KB: 1136                                   
Expired Blocks: 864 KB: 6912                                
Unexpired Blocks: 0 KB: 0                                   
============================================================
============================================================
Space Usage for SecureFile LOB TRBTKT.TICKETS.SCRNIMG       
Partition Name: STS_OTHER                                   
------------------------------------------------------------
Segment Blocks: 512 KB: 4096                                
Used Blocks: 501 KB: 4008                                   
Expired Blocks: 0 KB: 0                                     
Unexpired Blocks: 0 KB: 0                                   
============================================================
SET SERVEROUTPUT ON

修改SecureFile屬性

　　當我創建TRBTKT.SECURE_TICKETS表時，你可能注意到我爲每個LOB列在它們對應的分區中執行壓縮和重複刪除，重要的是我還使用了ALTER TABLE語句進行修正，另外，如果需要的話，我還可以在每個LOB獨立的分區上應用改變到SecureFile LOB。清單6中的代碼顯示了4個修改TRBTKT.TICKETS表的SecureFile LOB屬性的例子，注意這個表現在已經用清單3中的代碼和TRBTKT.SECURE_TICKETS表執行了交換，我也從DBA_PART_LOBS創建了一個報告顯示在修改這些LOB屬性前後的狀態，結果輸出如報告2所示。

　　清單6 管理SecureFile LOB屬性

SQL> ALTER TABLE TRBTKT.TICKETS
SQL>     MODIFY LOB(DOCUMENT) (NOCOMPRESS);

Table altered.


SQL> ALTER TABLE TRBTKT.TICKETS
SQL>     MODIFY LOB(SCRNIMG) (KEEP_DUPLICATES);

Table altered.

SQL> ALTER TABLE TRBTKT.TICKETS
SQL>     MODIFY PARTITION STS_PENDING LOB(SCRNIMG) (COMPRESS HIGH);
                                                                      
Table altered.
                                                                      
SQL> ALTER TABLE TRBTKT.TICKETS
SQL>     MODIFY PARTITION STS_PENDING LOB(DOCUMENT) (DEDUPLICATE);
                                                                      
Table altered.

報告2 修改許多SecureFile LOB後查詢DBA_LOB_PARTITIONS返回的結果

  BasicFile and SecureFile LOB Partitions
                                                         (from DBA_LOB_PARTITIONS)
                              Stored in               Stored                           DeDupli-
Table            Column       Partition    Cacheing   In Row     Encrypted  Compressed cated      SecureFile
---------------- ------------ ------------ ---------- ---------- ---------- ---------- --------
SECURE_TICKETS   DOCUMENT     STS_OTHER    NO         YES        NONE       NONE       NONE       NO
SECURE_TICKETS   DOCUMENT     STS_CLOSED   NO         YES        NONE       NONE       NONE       NO
SECURE_TICKETS   DOCUMENT     STS_OPEN     NO         YES        NONE       NONE       NONE       NO
SECURE_TICKETS   DOCUMENT     STS_PENDING  NO         YES        NONE       NONE       NONE       NO
SECURE_TICKETS   SCRNIMG      STS_OTHER    NO         YES        NONE       NONE       NONE       NO
SECURE_TICKETS   SCRNIMG      STS_CLOSED   NO         YES        NONE       NONE       NONE       NO
SECURE_TICKETS   SCRNIMG      STS_PENDING  NO         YES        NONE       NONE       NONE       NO
SECURE_TICKETS   SCRNIMG      STS_OPEN     NO         YES        NONE       NONE       NONE       NO
TICKETS          DOCUMENT     STS_OTHER    YES        NO         NO         NO         LOB        YES
TICKETS          DOCUMENT     STS_PENDING  YES        NO         NO         NO         LOB        YES
TICKETS          DOCUMENT     STS_CLOSED   YES        NO         NO         NO         LOB        YES
TICKETS          DOCUMENT     STS_OPEN     YES        NO         NO         NO         NO         YES
TICKETS          SCRNIMG      STS_PENDING  CACHEREADS NO         NO         HIGH       NO         YES
TICKETS          SCRNIMG      STS_OPEN     CACHEREADS NO         NO         MEDIUM     NO         YES
TICKETS          SCRNIMG      STS_CLOSED   CACHEREADS NO         NO         HIGH       NO         YES
TICKETS          SCRNIMG      STS_OTHER    CACHEREADS NO         NO         HIGH       NO         YES

         最後，請記住任何對LOB屬性進行修改都只會影響到新創建的LOB或新修改的LOB，例如，將列TRBTKT.SECURE_TICKETS.SCRNIMG的壓縮方法從COMPRESS修改爲NOCOMPRESS不會影響到現有的LOB條目。