您好,登錄后才能下訂單哦!
可以有以下幾種常用的辦法:
1、expdp/impdp
2、ctas + parallel + nologin
第二種方法要注意主鍵在新表是沒有創建的
NOT
NULL
constraints that were implicitly created by Oracle Database on columns of the selected table (for example, for primary keys) are not carried over to the new table.http://docs.oracle.com/cd/E11882_01/server.112/e41084/statements_7002.htm
3、exchange partition
以下針對第三種方法進行測試:
創建big_table腳本來自Oracle Database 9i10g11g編程藝術深入數據庫體系結構(第2版),轉換方式:普通表A.A->分區表A.A_TEMP->普通表B.B
1.創建測試表:
info@PROD> create table big_table 2 as 3 select rownum id, a.OWNER, a.OBJECT_NAME, a.SUBOBJECT_NAME, a.O 3 3 select rownum id, a.OWNER, a.OBJECT_NAME, a.SUBOBJECT_NAME, a.OBJECT_ID, a.DATA_OBJECT_ID 4 from all_objects a 5 where 1=0 6 / Table created. Elapsed: 00:00:00.09 info@PROD> alter table big_table nologging; Table altered. Elapsed: 00:00:00.01 info@PROD> declare 2 l_cnt number; 3 l_rows number := &1; 4 begin 5 insert /*+ append */ 6 into big_table 7 select rownum, a.OWNER, a.OBJECT_NAME, a.SUBOBJECT_NAME, a.OBJECT_ID, a.DATA_OBJECT_ID 8 from all_objects a 9 where rownum <= &1; 10 11 l_cnt := sql%rowcount; 12 13 commit; 14 15 while (l_cnt < l_rows) 16 loop 17 insert /*+ APPEND */ into big_table 18 select rownum+l_cnt, 19 OWNER, OBJECT_NAME, SUBOBJECT_NAME, OBJECT_ID, DATA_OBJECT_ID 20 from big_table 21 where rownum <= l_rows-l_cnt; 22 l_cnt := l_cnt + sql%rowcount; 23 commit; 24 end loop; 25 end; 26 / Enter value for 1: 8000000 old 3: l_rows number := &1; new 3: l_rows number := 8000000; Enter value for 1: 8000000 old 9: where rownum <= &1; new 9: where rownum <= 8000000; PL/SQL procedure successfully completed. Elapsed: 00:00:07.73 info@PROD> select count(*) from big_table; COUNT(*) ---------- 8000000 Elapsed: 00:00:01.86 info@PROD> alter table big_table add constraint big_table_pk primary key(id); Table altered. Elapsed: 00:00:38.63 info@PROD> info@PROD> exec dbms_stats.gather_table_stats( user, 'BIG_TABLE', estimate_percent=> 1); PL/SQL procedure successfully completed.
創建中間表:
info@PROD> CREATE TABLE big_table_temp 2 PARTITION BY RANGE (id) 3 (PARTITION id_1 VALUES LESS THAN (MAXVALUE)) 4 AS 5 SELECT * 6 FROM big_table 7 WHERE ROWNUM <= 0; info@PROD> alter table big_table_temp add constraint pk_big_table_temp_id primary key(id);
為pinfo用戶授權:
info@PROD> grant ALL on big_table to "PINFO"; info@PROD> grant ALL on big_table_temp to "PINFO";
登錄pinfo,創建info同名表:
info@PROD> conn pinfo/admin Connected. pinfo@PROD> CREATE TABLE pinfo.big_table 2 AS 3 SELECT * 4 FROM info.big_table 5 WHERE ROWNUM <= 0;
登錄info,將big_table交換至big_table_temp:
pinfo@PROD> conn info/admin info@PROD> ALTER TABLE big_table_temp EXCHANGE PARTITION id_1 WITH TABLE big_table EXCLUDING INDEXES WITHOUT VALIDATION; Table altered. Elapsed: 00:00:00.02 #此處使用了excludeing選項,否則會報 ORA-14098: index mismatch for tables in ALTER TABLE EXCHANGE PARTITION,可以在交換完成以后手動創建索引 info@PROD> select count(*) from big_table; COUNT(*) ---------- 0 info@PROD> select count(*) from info.big_table_temp; COUNT(*) ---------- 8000000
登錄pinfo,將big_table_temp交換至big_table:
pinfo@PROD> ALTER TABLE info.big_table_temp EXCHANGE PARTITION id_1 WITH TABLE pinfo.big_table EXCLUDING INDEXES WITHOUT VALIDATION; Table altered. Elapsed: 00:00:00.01 pinfo@PROD> select count(*) from big_table; COUNT(*) ---------- 8000000 Elapsed: 00:00:02.91 pinfo@PROD> select count(*) from info.big_table_temp; COUNT(*) ---------- 0
完成交換幾乎是毫秒級的。
也可以反向交換回去:
pinfo@PROD> ALTER TABLE info.big_table_temp EXCHANGE PARTITION id_1 WITH TABLE pinfo.big_table EXCLUDING INDEXES WITHOUT VALIDATION; info@PROD> conn info/admin info@PROD> ALTER TABLE big_table_temp EXCHANGE PARTITION id_1 WITH TABLE big_table exCLUDING INDEXES WITHOUT VALIDATION;
以下內容來自asktom,轉換方式:普通表A.A->分區表B.B
參考:https://asktom.oracle.com/pls/apex/f?p=100:11:0::::P11_QUESTION_ID:752030266230
To quickly move big tables between schemas use EXCHANGE PARTITION feature of Oracle 8i. for example: SQL> connect as user "A" SQL> create table large_table ( a number, b char, c date ) -- just for this example only. :) SQL> grant ALL on large_table to "B"; SQL> connect as user "B" SQL> create table large_table ( a number, b char, c date ) partition by range (a) ( partition dummy values less than (maxvalue) ) Then you can use the following command to quickly move "A.large_table" to "B.large_table" SQL> connect as user "B"; SQL> alter table large_table exchange partition dummy with table A.large_table; And return it back to schema A: SQL> alter table large_table exchange partition dummy with table A.large_table; -- of course, it is the same SQL command
免責聲明:本站發布的內容(圖片、視頻和文字)以原創、轉載和分享為主,文章觀點不代表本網站立場,如果涉及侵權請聯系站長郵箱:is@yisu.com進行舉報,并提供相關證據,一經查實,將立刻刪除涉嫌侵權內容。