ORACLE分区表转换在线重定义DBMS_REDEFINITION

也想出现在这里？点击联系我~

目录一、DBMS_REDEFINITION（在线重定义）使用在线重定义的一些限制条件：DBMS_REDEFINITION包：二、在线重定义表的步骤1.创建未分区的表2.确认表是否存在主键，表空间是否足够，收集表统计信息。3.调用DBMS_REDEFINITION.CAN_REDEF_TABLE()4.建立一个空的中间表5.调用DBMS_REDEFINITION.START_REDEF_TABLE6.（可选）在创建索引之前将新表与临时名称同步7.执行DBMS_REDEFINITION.FINISH_REDEF_TABLE8.重命名所有约束和索引以匹配原始名称

一、DBMS_REDEFINITION（在线重定义）

参考MOS文档：_How To Partition Existing Table Using DBMS_REDEFINITION (Doc ID 472449.1)_

支持的数据库版本：Oracle Database – Enterprise Edition -Version 9.2.0.4 and later

在线重定义是通过物化视图实现的。

使用在线重定义的一些限制条件：1、必须有足够的表空间来容纳表的两倍数据量。2、主键列不能被修改。3、表必须有主键。4、必须在同一个用户下进行在线重定义。5、SYS和SYSTEM用户下的表无法进行在线重定义。6、在线重定义无法采用nologging。7、如果中间表有新增列，则不能有NOT NULL约束

DBMS_REDEFINITION包：ABSORT_REDEF_TABLE：清理重定义的错误和中止重定义；CAN_REDEF_TABLE：检查表是否可以进行重定义,存储过程执行成功代表可以进行重定义；COPY_TABLE_DEPENDENTS：同步索引和依赖的对象（包括索引、约束、触发器、权限等）；FINISH_REDEF_TABLE：完成在线重定义；REGISTER_DEPENDENTS_OBJECTS：注册依赖的对象，如索引、约束、触发器等；START_REDEF_TABLE：开始在线重定义；SYNC_INTERIM_TABLE：增量同步数据；UNREGISTER_DEPENDENT_OBJECT：不注册依赖的对象，如索引、约束、触发器等；CREATE OR REPLACE PACKAGE SYS.dbms_redefinition AUTHID CURRENT_USER IS ———— — OVERVIEW — — This package provides the API to perform an online, out-of-place — redefinition of a table — ========= — CONSTANTS — ========= — Constants for the options_flag parameter of start_redef_table cons_use_pk CONSTANT PLS_INTEGER := 1; cons_use_rowid CONSTANT PLS_INTEGER := 2; — Constants used for the object types in the register_dependent_object cons_index CONSTANT PLS_INTEGER := 2; cons_constraint CONSTANT PLS_INTEGER := 3; cons_trigger CONSTANT PLS_INTEGER := 4; cons_mvlog CONSTANT PLS_INTEGER := 10; — constants used to specify the method of copying indexes cons_orig_params CONSTANT PLS_INTEGER := 1; PRAGMA SUPPLEMENTAL_LOG_DATA(default, AUTO_WITH_COMMIT); — NAME: can_redef_table – check if given table can be re-defined — INPUTS: uname – table owner name — tname – table name — options_flag – flag indicating user options to use — part_name – partition name PROCEDURE can_redef_table(uname IN VARCHAR2, tname IN VARCHAR2, options_flag IN PLS_INTEGER := 1, part_name IN VARCHAR2 := NULL); PRAGMA SUPPLEMENTAL_LOG_DATA(can_redef_table, NONE); — NAME: start_redef_table – start the online re-organization — INPUTS: uname – schema name — orig_table – name of table to be re-organized — int_table – name of interim table — col_mapping – select list col mapping — options_flag – flag indicating user options to use — orderby_cols – comma separated list of order by columns — followed by the optional ascending/descending — keyword — part_name – name of the partition to be redefined PROCEDURE start_redef_table(uname IN VARCHAR2, orig_table IN VARCHAR2, int_table IN VARCHAR2, col_mapping IN VARCHAR2 := NULL, options_flag IN BINARY_INTEGER := 1, orderby_cols IN VARCHAR2 := NULL, part_name IN VARCHAR2 := NULL); — NAME: finish_redef_table – complete the online re-organization — INPUTS: uname – schema name — orig_table – name of table to be re-organized — int_table – name of interim table — part_name – name of the partition being redefined PROCEDURE finish_redef_table(uname IN VARCHAR2, orig_table IN VARCHAR2, int_table IN VARCHAR2, part_name IN VARCHAR2 := NULL); — NAME: abort_redef_table – clean up after errors or abort the — online re-organization — INPUTS: uname – schema name — orig_table – name of table to be re-organized — int_table – name of interim table — part_name – name of the partition being redefined PROCEDURE abort_redef_table(uname IN VARCHAR2, orig_table IN VARCHAR2, int_table IN VARCHAR2, part_name IN VARCHAR2 := NULL); — NAME: sync_interim_table – synchronize interim table with the original — table — INPUTS: uname – schema name — orig_table – name of table to be re-organized — int_table – name of interim table — part_name – name of the partition being redefined PROCEDURE sync_interim_table(uname IN VARCHAR2, orig_table IN VARCHAR2, int_table IN VARCHAR2, part_name IN VARCHAR2 := NULL); — NAME: register_dependent_object – register dependent object — — INPUTS: uname – schema name — orig_table – name of table to be re-organized — int_table – name of interim table — dep_type – type of the dependent object — dep_owner – name of the dependent object owner — dep_orig_name- name of the dependent object defined on table — being re-organized — dep_int_name – name of the corressponding dependent object on — the interim table PROCEDURE register_dependent_object(uname IN VARCHAR2, orig_table IN VARCHAR2, int_table IN VARCHAR2, dep_type IN PLS_INTEGER, dep_owner IN VARCHAR2, dep_orig_name IN VARCHAR2, dep_int_name IN VARCHAR2); — NAME: unregister_dependent_object – unregister dependent object — — INPUTS: uname – schema name — orig_table – name of table to be re-organized — int_table – name of interim table — dep_type – type of the dependent object — dep_owner – name of the dependent object owner — dep_orig_name- name of the dependent object defined on table — being re-organized — dep_int_name – name of the corressponding dependent object on — the interim table PROCEDURE unregister_dependent_object(uname IN VARCHAR2, orig_table IN VARCHAR2, int_table IN VARCHAR2, dep_type IN PLS_INTEGER, dep_owner IN VARCHAR2, dep_orig_name IN VARCHAR2, dep_int_name IN VARCHAR2); — NAME: copy_table_dependents — — INPUTS: uname – schema name — orig_table – name of table to be re-organized — int_table – name of interim table — copy_indexes – integer value indicating whether to — copy indexes — 0 – don\’t copy — 1 – copy using storage params/tablespace — of original index — copy_triggers – TRUE implies copy triggers, FALSE otherwise — copy_constraints – TRUE implies copy constraints, FALSE — otherwise — copy_privileges – TRUE implies copy privileges, FALSE — otherwise — ignore errors – TRUE implies continue after errors, FALSE — otherwise — num_errors – number of errors that occurred while — cloning ddl — copy_statistics – TRUE implies copy table statistics, FALSE — otherwise. — If copy_indexes is 1, copy index — related statistics, 0 otherwise. — copy_mvlog – TRUE implies copy table\’s MV log, FALSE — otherwise. PROCEDURE copy_table_dependents(uname IN VARCHAR2, orig_table IN VARCHAR2, int_table IN VARCHAR2, copy_indexes IN PLS_INTEGER := 1, copy_triggers IN BOOLEAN := TRUE, copy_constraints IN BOOLEAN := TRUE, copy_privileges IN BOOLEAN := TRUE, ignore_errors IN BOOLEAN := FALSE, num_errors OUT PLS_INTEGER, copy_statistics IN BOOLEAN := FALSE, copy_mvlog IN BOOLEAN := FALSE);END;

二、在线重定义表的步骤

1.创建未分区的表

创建未分区的表，如果存在，就不需要操作。

–前置准备：创建用户，表空间，授权用户。SQL> create tablespace PARTITION;SQL> create user par identified by par;SQL> grant dba to par;–创建表,索引，授权，同义词SQL> conn par/parConnected.– Create tablecreate table student(s_id number(8) PRIMARY KEY,s_name varchar2(20) not null,s_sex varchar2(8),s_birdate date,constraint u_1 unique(s_name),constraint c_1 check (s_sex in (\’MALE\’,\’FEMALE\’)))tablespace PARTITION;– Add comments to the table comment on table STUDENT is \’学生表\’;– Add comments to the columns comment on column STUDENT.s_name is \’姓名\’;comment on column STUDENT.s_sex is \’性别\’;comment on column STUDENT.s_birdate is \’出生日期\’;– Create/Recreate indexes create index S_NAME_IDX on STUDENT (S_NAME, S_SEX) tablespace PARTITION;– Create SYNONYMCREATE SYNONYM stu FOR student;– Grant/Revoke object privileges grant select, insert, delete on STUDENT to SCOTT;–查看表结构SQL> desc stu Name Null? Type —————————————– ——– —————————- S_ID NOT NULL NUMBER(8) S_NAME NOT NULL VARCHAR2(20) S_SEX VARCHAR2(8) S_BIRDATE DATE–插入数据begin for i in 0 .. 24 loop insert into student values (i, \’student_\’ || i, decode(mod(i, 2), 0, \’MALE\’, \’FEMALE\’), add_months(to_date(\’2019-1-1\’, \’yyyy-mm-dd\’), i)); end loop; commit;end;/

2.确认表是否存在主键，表空间是否足够，收集表统计信息。–查看表主键SQL> select cu.* from user_cons_columns cu, user_constraints au where cu.constraint_name = au.constraint_name and au.constraint_type = \’P\’ and au.table_name = \’STUDENT\’;–查看表大小和表空间–查看表空间SQL> select tablespace_name from dba_segments where segment_type= \’TABLE\’ and segment_name=\’STUDENT\’ and owner=\’PAR\’;–查看表大小SQL> select sum(bytes/1024/1024) from dba_segments where segment_type= \’TABLE\’ and segment_name=\’STUDENT\’ and owner=\’PAR\’;–查看表空间select tbs_used_info.tablespace_name, tbs_used_info.alloc_mb, tbs_used_info.used_mb, tbs_used_info.max_mb, tbs_used_info.free_of_max_mb, tbs_used_info.used_of_max || \’%\’ used_of_max_pct from (select a.tablespace_name, round(a.bytes_alloc / 1024 / 1024) alloc_mb, round((a.bytes_alloc – nvl(b.bytes_free, 0)) / 1024 / 1024) used_mb, round((a.bytes_alloc – nvl(b.bytes_free, 0)) * 100 / a.maxbytes) used_of_max, round((a.maxbytes – a.bytes_alloc + nvl(b.bytes_free, 0)) / 1048576) free_of_max_mb, round(a.maxbytes / 1048576) max_mb from (select f.tablespace_name, sum(f.bytes) bytes_alloc, sum(decode(f.autoextensible, \’YES\’, f.maxbytes, \’NO\’, f.bytes)) maxbytes from dba_data_files f group by tablespace_name) a, (select f.tablespace_name, sum(f.bytes) bytes_free from dba_free_space f group by tablespace_name) b where a.tablespace_name = b.tablespace_name(+)) tbs_used_info order by tbs_used_info.used_of_max desc;–如果表空间不够，提前增加表空间大小alter tablespace PARTITION add datafile;–收集统计信息(可忽略)EXEC DBMS_STATS.gather_table_stats(\’PAR\’, \’STUDENT\’, cascade => TRUE);

3.调用DBMS_REDEFINITION.CAN_REDEF_TABLE()

调用DBMS_REDEFINITION.CAN_REDEF_TABLE()过程，确认表是否满足重定义的条件。

SQL> EXEC Dbms_Redefinition.can_redef_table(\’PAR\’, \’STUDENT\’);PL/SQL procedure successfully completed.

4.建立一个空的中间表

在用一个用户中建立一个空的中间表，根据重定义后你期望得到的结构建立中间表。比如：采用分区表（间隔分区），增加了COLUMN等。

在中间表上建立触发器、索引和约束，并进行相应的授权。任何包含中间表的完整性约束应将状态置为disabled。(此步骤也可以放在同步数据后操作)

–创建间隔分区(增加列s_phone)create table STUDENT_PAR( s_id NUMBER(8) not null, s_name VARCHAR2(20) not null, s_sex VARCHAR2(8), s_birdate DATE, s_phone number)tablespace PARTITIONPARTITION BY RANGE(s_birdate)INTERVAL (NUMTOYMINTERVAL(1,\’MONTH\’)) STORE IN (partition)(PARTITION STUDENT_201901 VALUES LESS THAN (TO_DATE(\’2019-02-01 00:00:00\’, \’SYYYY-MM-DD Hh34:MI:SS\’, \’NLS_CALENDAR=GREGORIAN\’)));–临时中间表上创建如下：–创建主键约束alter table STUDENT_PAR add primary key (S_ID) using index tablespace PARTITION;–创建唯一索引约束alter table STUDENT_PAR add constraint U_1_PAR unique (S_NAME) using index tablespace PARTITION;–创建check约束alter table STUDENT_PAR add constraint C_1_PAR check (s_sex in (\’MALE\’,\’FEMALE\’));–创建索引CREATE INDEX S_NAME_IDX_PAR ON STUDENT_PAR (S_NAME,S_SEX) tablespace PARTITION;–创建同义词CREATE SYNONYM stu_par FOR STUDENT_PAR;–添加描述COMMENT ON TABLE STUDENT_PAR IS \’学生表\’;COMMENT ON COLUMN STUDENT_PAR.s_name IS \’姓名\’;COMMENT ON COLUMN STUDENT_PAR.s_sex IS \’性别\’;COMMENT ON COLUMN STUDENT_PAR.s_birdate IS \’出生日期\’;–授权GRANT SELECT,INSERT,DELETE ON STUDENT_PAR TO scott;

5.调用DBMS_REDEFINITION.START_REDEF_TABLE

调用DBMS_REDEFINITION.START_REDEF_TABLE()过程，并提供下列参数：被重定义的表的名称、中间表的名称、列的映射规则、重定义方法。

如果映射方法没有提供，则认为所有包括在中间表中的列用于表的重定义。如果给出了映射方法，则只考虑映射方法中给出的列。如果没有给出重定义方法，则默认使用主键方式。

SQL> BEGINDBMS_REDEFINITION.start_redef_table(uname => \’PAR\’, orig_table => \’STUDENT\’,int_table => \’STUDENT_PAR\’);END;/PL/SQL procedure successfully completed.

6.（可选）在创建索引之前将新表与临时名称同步

Notes：如果在执行DBMS_REDEFINITION.START_REDEF_TABLE()过程和执行DBMS_REDEFINITION.FINISH_REDEF_TABLE()过程直接在重定义表上执行了大量的DML操作，那么可以选择执行一次或多次的SYNC_INTERIM_TABLE()过程，此操作可以减少最后一步执行FINISH_REDEF_TABLE()过程时的锁定时间。

–模拟业务不停，DML表数据写入insert into STUDENT values(25,\’student_25\’,\’MALE\’,to_date(\’2020-8-1\’, \’yyyy-mm-dd\’));update student set s_sex=\’FEMALE\’ where s_id = 20;commit;–比对student和student_par数据select s_id,s_name,s_sex,s_birdate from studentminusselect s_id,s_name,s_sex,s_birdate from student_par; S_ID S_NAMES_SEX S_BIRDATE———- ——————– ——– ——————20 student_20FEMALE 01-SEP-2025 student_25MALE 01-AUG-20–同步数据到临时表BEGINdbms_redefinition.sync_interim_table(uname => \’PAR\’, orig_table => \’STUDENT\’,int_table => \’STUDENT_PAR\’);END;/–数据已全部同步到临时表select s_id,s_name,s_sex,s_birdate from studentminusselect s_id,s_name,s_sex,s_birdate from student_par;no rows selected

7.执行DBMS_REDEFINITION.FINISH_REDEF_TABLE

执行DBMS_REDEFINITION.FINISH_REDEF_TABLE()过程完成表的重定义。这个过程中，原始表会被独占模式锁定一小段时间，具体时间和表的数据量有关。

执行完FINISH_REDEF_TABLE()过程后，原始表重定义后具有了中间表的属性、索引、约束、授权和触发器。中间表上disabled的约束在原始表上处于enabled状态。

–收集par table的统计信息EXEC DBMS_STATS.gather_table_stats(\’PAR\’, \’STUDENT_PAR\’, cascade => TRUE);–结束在线重定义过程BEGINdbms_redefinition.finish_redef_table(uname => \’PAR\’, orig_table => \’STUDENT\’,int_table => \’STUDENT_PAR\’);END;/SQL> select table_name，PARTITION_NAME from user_tab_partitions where table_name in (\’STUDENT\’,\’STUDENT_PAR\’);SQL> select table_name,index_name from user_indexes where table_name in (\’STUDENT\’,\’STUDENT_PAR\’);

此时，临时表（及其索引）已成为“真实”表，并且它们的名称已在名称词典中切换。

8.重命名所有约束和索引以匹配原始名称–drop中间表或者rename原来的约束a.drop table STUDENT_PAR;b.ALTER TABLE STUDENT_PAR RENAME CONSTRAINT U_1 TO U_1_20210411;ALTER TABLE STUDENT_PAR RENAME CONSTRAINT C_1 TO C_1_20210411;ALTER INDEX S_NAME_IDX RENAME TO S_NAME_IDX_20210411;ALTER INDEX U_1 RENAME TO U_1_20210411;–rename 新分区表的约束和索引ALTER TABLE STUDENT RENAME CONSTRAINT U_1_PAR TO U_1;ALTER TABLE STUDENT RENAME CONSTRAINT C_1_PAR TO C_1;ALTER INDEX S_NAME_IDX_PAR RENAME TO S_NAME_IDX;ALTER INDEX U_1_PAR RENAME TO U_1;–查看索引，约束名称是否正确select table_name,index_name from user_indexes where table_name in (\’STUDENT\’,\’STUDENT_PAR\’) order by table_name;TABLE_NAME INDEX_NAME—————————— ——————————STUDENT S_NAME_IDXSTUDENT SYS_C0011401STUDENT U_1STUDENT_PAR S_NAME_IDX_20210411STUDENT_PAR U_1_20210411STUDENT_PAR SYS_C0011395SQL> desc stu Name Null? Type —————————————– ——– —————————- S_ID NOT NULL NUMBER(8) S_NAME NOT NULL VARCHAR2(20) S_SEX VARCHAR2(8) S_BIRDATE DATE S_PHONE NUMBER

以上就是ORACLE分区表转换在线重定义DBMS_REDEFINITION的详细内容，更多关于ORACLE分区表转换在线重定义的资料请关注悠久资源其它相关文章！