Oracle 基本操作命令學習

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--- 2010-07-28 16:06:16

---- 關鍵字：  oracle 基本命令 tablespace user table purge analyze

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創建表空間

create tablespace dultest datafile 'e:/oracle/oradata/orcl/dultest.dbf'
size 100m autoextend on next 100m maxsize unlimited
default storage(

                        initial 20M

                        next 20M

                        minextents 1

                        maxextents unlimited

                        pctincrease 0

);

表空間僅有一個數據文件，數據文件初始大小爲100m，以後增長幅度爲100m，不限制上限。表空間dultest內的對象的默認的空間分配信息爲：對象初始大小爲20m，後續空間增長幅度爲20m。

通過系統視圖查看錶空間的信息：

SQL> set linesize 2000 SQL> col tablespace_name format a16 SQL> col datafile_name format a40 SQL> select ts.ts#,ts.name tablespace_name,file#, df.name datafile_name,block_size,blocks,bytes,status,enabled 2 from v$tablespace ts,v$datafile df 3 where ts.ts# = df.ts# and ts.name='DULTEST'; TS# TABLESPACE_NAME FILE# DATAFILE_NAME BLOCK_SIZE BLOCKS BYTES STATUS ENABLED ---------- ---------------- ---------- ---------------------------------------- ---------- ---------- ---------- ------- ---------- 8 DULTEST 6 E:/ORACLE/ORADATA/ORCL/DULTEST.DBF 8192 25600 209715200 ONLINE READ WRITE SQL>

刪除表空間及其表空間內所有的對象

drop tablespace dultest including contents and datafiles;

創建用戶dultest並授權

create user dultest identified by "db"
default tablespace "DULTEST"
temporary tablespace temp
profile default
account unlock;

SQL> select user_id,username,account_status,lock_date,expiry_date,default_tablespace,temporary_tablespace, 2 created,profile from dba_users where username='TEST'; USER_ID USERNAME ACCOUNT_STATUS LOCK_DATE EXPIRY_DATE DEFAULT_TABLESPACE TEMPORARY_TABLESPACE CREATED PROFILE ---------- ------------------------------ -------------------------------- -------------- -------------- ------------------------------ ------------------------------ -------------- ----------- 78 TEST OPEN DULTEST TEMP 28-7月 -10 DEFAULT

將角色connect和resoure授權給dultest用戶

grant connect,resource to dultest;

授予dultest創建表的權限

grant create table to dultest;

SQL> SELECT * FROM DBA_ROLE_PRIVS 2 WHERE GRANTEE='TEST'; GRANTEE GRANTED_ROLE ADM DEF ------------------------------ ------------------------------ --- --- TEST RESOURCE NO YES TEST CONNECT NO YES

SQL> SELECT * FROM DBA_SYS_PRIVS 2 WHERE GRANTEE='TEST'; GRANTEE PRIVILEGE ADM ------------------------------ ---------------------------------------- --- TEST UNLIMITED TABLESPACE NO

刪除用戶dultest

drop user dultest cascade;

如果被刪除的用戶在線，提示： drop user dultest cascade * 第 1 行出現錯誤: ORA-01940: 無法刪除當前已連接的用戶

等待dultest退出時，再執行刪除操作。

合併表空間的碎片

alter tablespace dultest coalesce;

查詢系統回收站的被刪除的對象

select * from sys.recyclebin$;

清楚回收站的對象

purge table dultest.aaa;

把用exp導出的用戶dultest的對象導入到用戶test中

imp system/[email protected]  file=c:/dultest_tblspace.dmp fromuser=dultest touser=test ignore=y

查看錶的一些信息

SELECT o.owner, t.tablespace_name,o.object_id,o.object_name table_name,o.created,o.last_ddl_time,o.status,
t.num_rows,t.blocks,t.empty_blocks,t.avg_space,t.avg_row_len,  /*空間使用信息*/
t.pct_free,t.pct_used,t.ini_trans,t.max_trans,t.initial_extent,t.next_extent,
t.min_extents,t.max_extents,t.pct_increase
from dba_objects o,dba_tables t
WHERE o.object_name =  t.table_name and t.OWNER='TEST';

SQL> col owner format a10 SQL> col tablespace_name format a15 SQL> col table_name format a30 SQL> SELECT o.owner, t.tablespace_name,o.object_id,o.object_name table_name, 2 t.pct_free,t.pct_used,t.ini_trans,t.max_trans,t.initial_extent,t.next_extent, 3 t.min_extents,t.max_extents,t.pct_increase 4 from dba_objects o,dba_tables t 5 WHERE o.object_name = t.table_name and t.OWNER='TEST'; OWNER TABLESPACE_NAME OBJECT_ID TABLE_NAME PCT_FREE PCT_USED INI_TRANS MAX_TRANS INITIAL_EXTENT NEXT_EXTENT MIN_EXTENTS MAX_EXTENTS PCT_INCREASE ---------- --------------- ---------- ------------------------------ ---------- ---------- ---------- ---------- -------------- ----------- ----------- ----------- ------------ TEST DULTEST 56181 PM_HOU_J_RESMSSQLINSTANCE 10 1 255 20971520 20971520 1 2147483645 0 TEST DULTEST 56179 PM_DAY_J_RESDATAFILE 10 1 255 20971520 20971520 1 2147483645 0 TEST DULTEST 56180 PM_DAY_S_RESCPU 10 1 255 20971520 20971520 1 2147483645 0 TEST DULTEST 56182 PM_HOU_S_RESPROCESS 10 1 255 20971520 20971520 1 2147483645 0 SQL>

由上面的數據可以看出，四張表的initial_extent和next_extent都是20971520（20M）。這是因爲在創建表的時候沒有指定表的存儲屬性，而是繼承了所屬表空間dultest的空間屬性。

SQL> col owner format a10 SQL> col tablespace_name format a15 SQL> col table_name format a30 SQL> SELECT o.owner, t.tablespace_name,o.object_id,o.object_name table_name,o.created,o.last_ddl_time,o.status, 2 t.num_rows,t.blocks,t.empty_blocks,t.avg_space,t.avg_row_len /*空間使用信息*/ 3 from dba_objects o,dba_tables t 4 WHERE o.object_name = t.table_name and t.OWNER='TEST'; OWNER TABLESPACE_NAME OBJECT_ID TABLE_NAME CREATED LAST_DDL_TIME STATUS NUM_ROWS BLOCKS EMPTY_BLOCKS AVG_SPACE AVG_ROW_LEN ---------- --------------- ---------- ------------------------------ -------------- -------------- ------- ---------- ---------- ------------ ---------- ----------- TEST DULTEST 56181 PM_HOU_J_RESMSSQLINSTANCE 28-7月 -10 28-7月 -10 VALID 31982 172 0 0 33 TEST DULTEST 56179 PM_DAY_J_RESDATAFILE 28-7月 -10 28-7月 -10 VALID 165823 905 0 0 32 TEST DULTEST 56180 PM_DAY_S_RESCPU 28-7月 -10 28-7月 -10 VALID 17860 100 0 0 32 TEST DULTEST 56182 PM_HOU_S_RESPROCESS 28-7月 -10 28-7月 -10 VALID 1536573 8601 0 0 34 SQL>

由上面可以看出各個表的行數、使用的blocks、空塊、以及每行的平均長度。但是，目前看到的這些信息可能是不準確的。

由於表PM_HOU_J_RESMSSQLINSTANCE的默認initial_extent和next_extent都是20M（2560 blocks）。而blocks和empty_blocks的總和不是2560的整數倍。

更行表的統計信息：

analyze table test.PM_HOU_J_RESMSSQLINSTANCE compute statistics; analyze table test.PM_DAY_J_RESDATAFILE compute statistics; analyze table test.PM_DAY_S_RESCPU compute statistics; analyze table test.PM_HOU_S_RESPROCESS compute statistics;

這時的表信息爲：

SQL> col owner format a10 SQL> col tablespace_name format a15 SQL> col table_name format a30 SQL> SELECT o.owner, t.tablespace_name,o.object_id,o.object_name table_name,o.created,o.last_ddl_time,o.status, 2 t.num_rows,t.blocks,t.empty_blocks,t.avg_space,t.avg_row_len /*空間使用信息*/ 3 from dba_objects o,dba_tables t 4 WHERE o.object_name = t.table_name and t.OWNER='TEST'; OWNER TABLESPACE_NAME OBJECT_ID TABLE_NAME CREATED LAST_DDL_TIME STATUS NUM_ROWS BLOCKS EMPTY_BLOCKS AVG_SPACE AVG_ROW_LEN ---------- --------------- ---------- ------------------------------ -------------- -------------- ------- ---------- ---------- ------------ ---------- ----------- TEST DULTEST 56181 PM_HOU_J_RESMSSQLINSTANCE 28-7月 -10 28-7月 -10 VALID 32400 214 2346 2299 36 TEST DULTEST 56179 PM_DAY_J_RESDATAFILE 28-7月 -10 28-7月 -10 VALID 164550 918 1642 944 38 TEST DULTEST 56180 PM_DAY_S_RESCPU 28-7月 -10 28-7月 -10 VALID 17860 150 2410 3358 38 TEST DULTEST 56182 PM_HOU_S_RESPROCESS 28-7月 -10 28-7月 -10 VALID 1576338 8828 1412 1009 38 SQL>

可以看到表的這些列NUM_ROWS     BLOCKS EMPTY_BLOCKS  AVG_SPACE AVG_ROW_LEN的數據都被更新了。

blocks+empty_blocks爲2560的整數倍。

行數也是目前最準確的了。

SQL> select count(*) from test.PM_HOU_J_RESMSSQLINSTANCE; COUNT(*) ---------- 32400 SQL> select count(*) from test.PM_DAY_J_RESDATAFILE; COUNT(*) ---------- 164550 SQL> select count(*) from test.PM_DAY_S_RESCPU; COUNT(*) ---------- 17860 SQL> select count(*) from test.PM_HOU_S_RESPROCESS; COUNT(*) ---------- 1576338