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分享一篇Oracle数据库在打完补丁后startup migrate、startup upgrade区别分析

1、为什么要使用Startup Migrate

STARTUP MIGRATE was introduced in 9.2 as a mechanism to be sure that most everything that needs to be done to run an upgrade script or a patch script is done automatically. In the past, customers were expected to adjust certain initialization parameters prior to beginning an upgrade or applying a a patch, but most of this is now done automatically by STARTUP MIGRATE. When a customer starts a database in MIGRATE mode, the following ALTER SYSTEM commands will be set automatically:

ALTER SYSTEM ENABLE RESTRICTED SESSION;

ALTER SYSTEM SET “_SYSTEM_TRIG_ENABLED”=FALSE SCOPE=MEMORY;

ALTER SYSTEM SET _undo_autotune=FALSE SCOPE=MEMORY;

ALTER SYSTEM SET undo_retention=900 SCOPE=MEMORY;

ALTER SYSTEM SET JOB_QUEUE_PROCESSES=0 SCOPE=MEMORY;

ALTER SYSTEM SET AQ_TM_PROCESSES=0 SCOPE=MEMORY;

这些我们可以从数据库的Startup Migrate命令启动数据库的日志中可以看出来

Sun Oct 9 21:53:04 2011

ALTER SYSTEM enable restricted session;

Sun Oct 9 21:53:04 2011

ALTER SYSTEM SET _system_trig_enabled=FALSE SCOPE=MEMORY;

Autotune of undo retention is turned off.

Sun Oct 9 21:53:04 2011

ALTER SYSTEM SET _undo_autotune=FALSE SCOPE=MEMORY;

Sun Oct 9 21:53:04 2011

ALTER SYSTEM SET undo_retention=900 SCOPE=MEMORY;

MMNL started with pid=12, OS id=8452

Sun Oct 9 21:53:04 2011

ALTER SYSTEM SET aq_tm_processes=0 SCOPE=MEMORY;

Sun Oct 9 21:53:04 2011

Resource Manager disabled during database migration: plan '' not set

Sun Oct 9 21:53:04 2011

ALTER SYSTEM SET resource_manager_plan='' SCOPE=MEMORY;

replication_dependency_tracking turned off (no async multimaster replication found)

Completed: ALTER DATABASE OPEN MIGRATE

2、Startup Migrate主用作用

在9i，无论升级/降级 数据库都是startup migrate

10g后增加了upgrade参数，升级可直接用startup upgrade，降级仍是startup migrate

3、Startup Migrate辅助作用(解决部分ORA-00701)

SQL> alter index I_H_OBJ#_COL# rebuild;

alter index I_H_OBJ#_COL# rebuild

*

ERROR at line 1:

ORA-00701: object necessary for warmstarting database cannot be altered

SQL> shutdown immediate;

Database closed.

Database dismounted.

ORACLE instance shut down.

SQL> startup migrate;

ORACLE instance started.

Total System Global Area 139531744 bytes

Fixed Size 452064 bytes

Variable Size 121634816 bytes

Database Buffers 16777216 bytes

Redo Buffers 667648 bytes

Database mounted.

Database opened.

SQL> alter index I_H_OBJ#_COL# rebuild;

Index altered.

SQL> shutdown immediate;

Database closed.

Database dismounted.

ORACLE instance shut down.

SQL> startup

ORACLE instance started.

Total System Global Area 139531744 bytes

Fixed Size 452064 bytes

Variable Size 121634816 bytes

Database Buffers 16777216 bytes

Redo Buffers 667648 bytes

Database mounted.

Database opened.

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最权威、专业的Oracle案例资源汇总之【学习笔记】Oracle打补丁后startup migrate、startup upgrade区别分析