11G DBMS_REDEFINITION修改表数据类型
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SYS@honor1 > SET LONG 999999
SYS@honor1 > SELECT DBMS_METADATA.GET_DDL('TABLE','TEST_REDE','HR') FROM DUAL;
CREATE TABLE "HR"."TEST_REDE"
( "OWNER" VARCHAR2(30),
"OBJECT_NAME" VARCHAR2(128),
"SUBOBJECT_NAME" VARCHAR2(30),
"OBJECT_ID" VARCHAR2(20),
"DATA_OBJECT_ID" NUMBER,
"OBJECT_TYPE" VARCHAR2(19),
"CREATED" DATE,
"LAST_DDL_TIME" DATE,
"TIMESTAMP" VARCHAR2(19),
"STATUS" VARCHAR2(7),
"TEMPORARY" VARCHAR2(1),
"GENERATED" VARCHAR2(1),
"SECONDARY" VARCHAR2(1),
"NAMESPACE" NUMBER,
"EDITION_NAME" VARCHAR2(30)
)
TABLESPACE "USERS";# 由于表没有主键，所以只能使用ROWID，如果表有主键，可以删掉CONS_USE_ROWID，默认使用PK
BEGIN
DBMS_REDEFINITION.CAN_REDEF_TABLE('HR','TEST_REDE',
DBMS_REDEFINITION.CONS_USE_ROWID);
END;
/CREATE TABLE "HR"."TEST_REDE_INTER" ( "OWNER" VARCHAR2(30), "OBJECT_NAME" VARCHAR2(128), "SUBOBJECT_NAME" VARCHAR2(30), "OBJECT_ID" VARCHAR2(20), "DATA_OBJECT_ID" VARCHAR2(10), --需要修改后的数据类型 "OBJECT_TYPE" VARCHAR2(19), "CREATED" DATE, "LAST_DDL_TIME" DATE, "TIMESTAMP" VARCHAR2(19), "STATUS" VARCHAR2(7), "TEMPORARY" VARCHAR2(1), "GENERATED" VARCHAR2(1), "SECONDARY" VARCHAR2(1), "NAMESPACE" NUMBER, "EDITION_NAME" VARCHAR2(30) ) TABLESPACE "USERS";
alter session force parallel dml parallel 4; alter session force parallel query parallel 4; BEGIN DBMS_REDEFINITION.START_REDEF_TABLE( uname => 'HR', orig_table => 'TEST_REDE', int_table => 'TEST_REDE_INTER', col_mapping => 'OWNER OWNER, OBJECT_NAME OBJECT_NAME, SUBOBJECT_NAME SUBOBJECT_NAME, OBJECT_ID OBJECT_ID, to_char(DATA_OBJECT_ID) DATA_OBJECT_ID, --由于更改数据类型，需要手工转换 OBJECT_TYPE OBJECT_TYPE, CREATED CREATED, LAST_DDL_TIME LAST_DDL_TIME, TIMESTAMP TIMESTAMP, STATUS STATUS, TEMPORARY TEMPORARY, GENERATED GENERATED, SECONDARY SECONDARY, NAMESPACE NAMESPACE, EDITION_NAME EDITION_NAME', options_flag => DBMS_REDEFINITION.CONS_USE_ROWID); END; /
begin dbms_redefinition.sync_interim_table(uname => '&USERNAME', orig_table => '&SOURCE_TAB', int_table => '&INT_TAB'); end; /
# 如果更改了列名，或者增加列，必要时，手工创建相关索引等对象 DECLARE num_errors PLS_INTEGER; BEGIN DBMS_REDEFINITION.COPY_TABLE_DEPENDENTS(uname => '&USERNAME', orig_table => '&SOURCE_TAB', int_table => '&INT_TAB', copy_indexes => DBMS_REDEFINITION.cons_orig_params, copy_triggers => TRUE, copy_constraints => TRUE, copy_privileges => TRUE, ignore_errors => FALSE, num_errors => num_errors, copy_statistics => TRUE); END; /
参考：
https://blog.csdn.net/bikeorcl/article/details/103974032
