1、模擬大表 --新建測試表 create tablespace test datafile 'F:\APP\ADMINISTRATOR\ORADATA\ORCL\test01.DBF' size 2000m autoextend on next 100m maxsize unlimited extent management local autoallocate segment space management auto; create table t1 ( tid number not null primary key, sname varchar2(10) ) tablespace test; --循環導入數據 declare maxrecords constant int:=200000; i int :=1; begin for i in 1..maxrecords loop insert into t1 values(i,'ocpyang'); end loop; dbms_output.put_line(' 成功錄入數據! '); commit; end; / -------方法1:在線重定義 建立中間表(分區表,你想得到的格式) CREATE TABLE t11 ( tid number not null primary key, sname varchar2(10) ) PARTITION BY RANGE (tid) ( PARTITION p1 VALUES LESS THAN (50000) tablespace test, PARTITION p2 VALUES LESS THAN (100000) tablespace test, PARTITION p3 VALUES LESS THAN (150000) tablespace test, PARTITION p4 VALUES LESS THAN (300000) tablespace test ) ; 驗證原表是否可以在線遷移 exec dbms_redefinition.can_redef_table('SCOTT','T1'); 新開啓一個會話驗證當前會話沒有REDO產生 select t3.sid,t2.NAME,t1.VALUE from v$sesstat t1 , v$statname t2 , (select SID from v$mystat where rownum<=1) t3 where t1.SID=t3.sid and t1.STATISTIC#=t2.STATISTIC# and t2.name like '%redo%' and t1.VALUE<>0 ; SID NAME VALUE ---------- -------------------------------------------------- ---------- 200 redo entries 407915 200 redo size 106889084 200 redo size for direct writes 2729848 200 redo buffer allocation retries 3 200 redo log space requests 5 200 redo log space wait time 23 200 redo ordering marks 1031 200 redo subscn max counts 17 200 redo synch time 1 200 redo synch time (usec) 6903 200 redo synch writes 5 開始聯機重定義: SQL> exec dbms_redefinition.start_redef_table('SCOTT','T1','T11'); 同步數據: SQL> exec dbms_redefinition.sync_interim_table('SCOTT','T1','T11'); 結束聯機重定義: SQL> exec dbms_redefinition.finish_redef_table('SCOTT','T1','T11'); select t3.sid,t2.NAME,t1.VALUE from v$sesstat t1 , v$statname t2 , (select SID from v$mystat where rownum<=1) t3 where t1.SID=t3.sid and t1.STATISTIC#=t2.STATISTIC# and t2.name like '%redo%' and t1.VALUE<>0 ; SID NAME VALUE ---------- -------------------------------------------------- ---------- 200 redo entries 419232 200 redo size 130386624 200 redo size for direct writes 11235576 200 redo buffer allocation retries 3 200 redo log space requests 5 200 redo log space wait time 23 200 redo ordering marks 1993 200 redo subscn max counts 41 200 redo synch time 25 200 redo synch time (usec) 243493 200 redo synch writes 33 查看數據已經移動完成,索引已經遷移. 如果分區表並沒有主鍵,我們建立主鍵 alter table t11 add constraint pk_t11 primary key (tid); ---方法2 使用NOLOGGING方法 CREATE TABLE t12 ( tid number not null primary key, sname varchar2(10) ) PARTITION BY RANGE (tid) ( PARTITION p1 VALUES LESS THAN (50000) tablespace test nologging , PARTITION p2 VALUES LESS THAN (100000) tablespace test nologging, PARTITION p3 VALUES LESS THAN (150000) tablespace test nologging, PARTITION p4 VALUES LESS THAN (300000) tablespace test nologging ) ; /****或對分區表修改 alter table t12 modify partition p1 nologging; ***/ select t3.sid,t2.NAME,t1.VALUE from v$sesstat t1 , v$statname t2 , (select SID from v$mystat where rownum<=1) t3 where t1.SID=t3.sid and t1.STATISTIC#=t2.STATISTIC# and t2.name like '%redo%' and t1.VALUE<>0 ; SID NAME VALUE ---------- -------------------------------------------------- ---------- 200 redo entries 419448 200 redo size 130464436 200 redo size for direct writes 11252032 200 redo buffer allocation retries 3 200 redo log space requests 5 200 redo log space wait time 23 200 redo ordering marks 1998 200 redo subscn max counts 41 200 redo synch time 25 200 redo synch time (usec) 244362 200 redo synch writes 37 然後開啓新會話進行INSERT APPEND insert /* +append */ into t12 select * from t1; select t3.sid,t2.NAME,t1.VALUE from v$sesstat t1 , v$statname t2 , (select SID from v$mystat where rownum<=1) t3 where t1.SID=t3.sid and t1.STATISTIC#=t2.STATISTIC# and t2.name like '%redo%' and t1.VALUE<>0 ; SID NAME VALUE ---------- -------------------------------------------------- ---------- 200 redo entries 434385 200 redo size 155328372 200 redo size for direct writes 11260260 200 redo buffer allocation retries 5 200 redo log space requests 7 200 redo log space wait time 29 200 redo ordering marks 2775 200 redo subscn max counts 50 200 redo synch time 28 200 redo synch time (usec) 273343 200 redo synch writes 39 alter table t12 rename to t1; --修改分區表爲T1的表名即可 ---方法3 直接使用CREATE TABLE NOLOGGING方式 select t3.sid,t2.NAME,t1.VALUE from v$sesstat t1 , v$statname t2 , (select SID from v$mystat where rownum<=1) t3 where t1.SID=t3.sid and t1.STATISTIC#=t2.STATISTIC# and t2.name like '%redo%' and t1.VALUE<>0 ; SID NAME VALUE ---------- -------------------------------------------------- ---------- 200 redo entries 434385 200 redo size 155328372 200 redo size for direct writes 11260260 200 redo buffer allocation retries 5 200 redo log space requests 7 200 redo log space wait time 29 200 redo ordering marks 2775 200 redo subscn max counts 50 200 redo synch time 28 200 redo synch time (usec) 273343 200 redo synch writes 39 CREATE TABLE t13 PARTITION BY RANGE (tid) ( PARTITION p1 VALUES LESS THAN (50000) tablespace test nologging , PARTITION p2 VALUES LESS THAN (100000) tablespace test nologging, PARTITION p3 VALUES LESS THAN (150000) tablespace test nologging, PARTITION p4 VALUES LESS THAN (300000) tablespace test nologging ) as select * from t1; select t3.sid,t2.NAME,t1.VALUE from v$sesstat t1 , v$statname t2 , (select SID from v$mystat where rownum<=1) t3 where t1.SID=t3.sid and t1.STATISTIC#=t2.STATISTIC# and t2.name like '%redo%' and t1.VALUE<>0 ; SID NAME VALUE ---------- -------------------------------------------------- ---------- 200 redo entries 434699 200 redo size 155392656 200 redo size for direct writes 11262224 200 redo buffer allocation retries 5 200 redo log space requests 7 200 redo log space wait time 29 200 redo ordering marks 2782 200 redo subscn max counts 50 200 redo synch time 28 200 redo synch time (usec) 273797 200 redo synch writes 40 alter table t13 rename to t1; ----修改分區表爲T1的表名即可 -------方法4:交換分區 SQL> select constraint_name from user_constraints where table_name='T1'; CONSTRAINT_NAME ------------------------------ SYS_C0025179 SYS_C0025180 ALTER TABLE t1 DROP PRIMARY KEY; CREATE TABLE t14 ( tid number not null, sname varchar2(10) ) PARTITION BY RANGE (tid) ( PARTITION p1 VALUES LESS THAN (300000) tablespace test nologging , PARTITION p2 VALUES LESS THAN (400000) tablespace test nologging, PARTITION p3 VALUES LESS THAN (500000) tablespace test nologging, PARTITION p4 VALUES LESS THAN (600000) tablespace test nologging ) ; select count(*) from t1; COUNT(*) ---------- 200000 select count(*) from t14 partition (p1); COUNT(*) ---------- 0 alter table t14 exchange partition p1 with table t1; alter table t14 add constraint pk_t14 primary key(tid); alter table t14 rename to t1;
oracle 11.2 普通錶轉換爲分區表的常見方法
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