mysql table to big_Oracle 测试常用表BIG_TABLE

最新推荐文章于 2022-02-22 17:07:18 发布

原创最新推荐文章于 2022-02-22 17:07:18 发布 · 105 阅读

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#mysql table to big

本文提供Oracle 10g及11g环境下快速创建并填充大量数据的大表方法。通过使用all_objects视图作为数据源，实现大表的创建，并提供步骤指导如何设置为非归档模式、填充指定数量的数据行、添加主键约束以及收集表统计信息。

创建测试用表，DBA经常用到，通常都是基于dba_objects来创建的比较多。本文根据Tom大师的big_table进行了整理，供大家参考。一、基于Oracle 10g下的big_table --==============================================-- Create a test table for Oracle 10g-- Fi

创建测试用表，，DBA经常用到，通常都是基于dba_objects来创建的比较多。本文根据Tom大师的big_table进行了整理，供大家参考。

一、基于Oracle 10g下的big_table

--==============================================

-- Create a test table for Oracle 10g

-- File : cr_big_tb_10g.sql

-- Author : Robinson

-- Blog :

--==============================================

prompt

Create a big table from all_objects

prompt ======================================

CREATE TABLE big_table

SELECT ROWNUM id, a.*

FROM all_objects a

WHERE 1=0;

prompt

prompt Modify table to nologgming mode

prompt ==========================

ALTER TABLE big_table NOLOGGING;

prompt

Please input rows number to fill into big_table

prompt

============================================

DECLARE

l_cnt NUMBER;

l_rows NUMBER := &1;

BEGIN

INSERT /*+ append */

INTO big_table

SELECT rownum, a.*

FROM all_objects a;

l_cnt := SQL%ROWCOUNT;

COMMIT;

WHILE (l_cnt < l_rows)

LOOP

INSERT /*+ APPEND */

INTO big_table

SELECT rownum + l_cnt

,owner

,object_name

,subobject_name

,object_id

,data_object_id

,object_type

,created

,last_ddl_time

,TIMESTAMP

,status

,temporary

,generated

,secondary

FROM big_table

WHERE rownum <= l_rows - l_cnt;

l_cnt := l_cnt + SQL%ROWCOUNT;

COMMIT;

END LOOP;

END;

prompt

Add primary key for big table

prompt

=====================================

ALTER TABLE big_table ADD CONSTRAINT

big_table_pk PRIMARY KEY (id);

prompt

Gather statistics for big_table

prompt

=====================================

BEGIN

dbms_stats.gather_table_stats(ownname => USER,

tabname => 'BIG_TABLE',

method_opt => 'for all indexed columns',

cascade => TRUE);

END;

prompt

check total rows for big_table

prompt

====================================

SELECT COUNT(*)

FROM big_table;

二、基于Oracle 11g下的big_table

--==============================================

-- Create a test table for Oracle 11g

-- File : cr_big_tb_11g.sql

-- Author : Robinson

-- Blog :

--==============================================

prompt

Create a big table from all_objects

prompt ======================================

CREATE TABLE big_table

SELECT ROWNUM id, a.*

FROM all_objects a

WHERE 1=0;

prompt

prompt Modify table to nologgming mode

prompt ==========================

ALTER TABLE big_table NOLOGGING;

prompt

Please input rows number to fill into big_table

prompt

============================================

DECLARE

l_cnt NUMBER;

l_rows NUMBER := &1;

BEGIN

INSERT /*+ append */

INTO big_table

SELECT rownum, a.*

FROM all_objects a;

l_cnt := SQL%ROWCOUNT;

COMMIT;

WHILE (l_cnt < l_rows)

LOOP

INSERT /*+ APPEND */

INTO big_table

SELECT rownum + l_cnt

,owner

,object_name

,subobject_name

,object_id

,data_object_id

,object_type

,created

,last_ddl_time

,TIMESTAMP

,status

,temporary

,generated

,secondary

,namespace

,edition_name

FROM big_table

WHERE rownum <= l_rows - l_cnt;

l_cnt := l_cnt + SQL%ROWCOUNT;

COMMIT;

END LOOP;

END;

prompt

Add primary key for big table

prompt

=====================================

ALTER TABLE big_table ADD CONSTRAINT

big_table_pk PRIMARY KEY (id);

prompt

Gather statistics for big_table

prompt

=====================================

BEGIN

dbms_stats.gather_table_stats(ownname => USER,

tabname => 'BIG_TABLE',

method_opt => 'for all indexed columns',

cascade => TRUE);

END;

prompt

check total rows for big_table

prompt

====================================

SELECT COUNT(*)

FROM big_table;

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