启动数据库报错，ORA-18008: cannot find OUTLN schema 问题现象： 数据库版本 Oracle 11g r2 hrdb1startup Oracle 例程已经启动。 Total System Global Area 4392697856 bytes Fixed Size 2233616 bytes Variable Size 1090521840 bytes Database Buffers 32

启动数据库报错，ORA-18008: cannot find OUTLN schema

问题现象：
数据库版本 Oracle 11g r2
hrdb1>startup
Oracle 例程已经启动。

Total System Global Area 4392697856 bytes


Fixed Size 2233616 bytes
Variable Size 1090521840 bytes
Database Buffers 3288334336 bytes
Redo Buffers 116080 bytes
数据库装载完毕。
ORA-01092: Oracle instance terminated. Disconnection forced
ORA-18008: cannot find OUTLN schema
进程 ID: 5294
会话 ID: 683 序列号: 3


hrdb1>!oerr ora 18008
18008, 00000, "cannot find OUTLN schema"
// *Cause: The database creation script that creates this schema must not
// have been executed.
// *Action: Review the log files to see what happened when the database
// was created.

问题原因：
outlin用户被误删除

解决方法：

按照metalink上的解决办法，先修改replication_dependency_tracking参数，重建数据库outln用户及相关对象即可。

1，启动到mount状态，修改replication_dependency_tracking参数
alter system set replication_dependency_tracking =false scope=spfile;

2，启动数据库至open状态
hrdb1>shutdown immediate
hrdb1>startup

3，执行脚本doptim.bsq，Oracle 10g版本可参考执行附录脚本
@$Oracle_HOME/rdbms/admin/doptim.bsq

此时，用户已创建

hrdb1>select username from dba_users;

USERNAME
------------------------------
OUTLN

4，修改回replication_dependency_tracking参数为true

alter system set replication_dependency_tracking =true scope=spfile;


5，重新启动数据库，系统恢复正常
hrdb1>shutdown abort
Oracle 例程已经关闭。
hrdb1>startup
Oracle 例程已经启动。

Total System Global Area 4392697856 bytes
Fixed Size 2233616 bytes
Variable Size 1090521840 bytes
Database Buffers 3288334336 bytes
Redo Buffers 116080 bytes
数据库装载完毕。
数据库已经打开。
hrdb1>select username from dba_users;

USERNAME
------------------------------
WJ
OUTLN
SYS
SYSTEM
HR
STRMADMIN

已选择6行。


由于版本是Oracle 11g，直接执行相关脚本即可，oracle 10g版本可以参考《Script to Create User OUTLN in 10.2 [ID 422983.1]》

备注：用于复制的一个参数，第一次碰到，做个记录
REPLICATION_DEPENDENCY_TRACKING enables or disables dependency tracking for read/write operations to the database. Dependency tracking is essential for propagating changes in a replicated environment in parallel.

参考资料：
Unable To Start The Database With OUTLN Schema Dropped ORA-01092& ORA-18008 [ID 855104.1]
Script to Create User OUTLN in 10.2 [ID 422983.1]

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