Oracle跟踪分析数据库启动的各个阶段

• 启动到nomount状态
• 设置trace
• 启动数据库到mount状态并打开
• 查阅trace
• 查阅trace的另外方法 v$diag_info 视图

演示如下：

启动到nomount状态

SYS@kyeupdbfs> startup nomount;
ORACLE instance started.

Total System Global Area 1720328192 bytes
Fixed Size          2253944 bytes
Variable Size         754977672 bytes
Database Buffers      956301312 bytes
Redo Buffers            6795264 bytes

设置trace

SYS@kyeupdbfs> oradebug setmypid;
Statement processed.
SYS@kyeupdbfs> oradebug tracefile_name;
/oracle/app/oracle/diag/rdbms/kyeupdbfs/kyeupdbfs/trace/kyeupdbfs_ora_13343.trc
SYS@kyeupdbfs> alter session set events '10046 trace name context forever,level 12';

Session altered.

启动数据库到mount状态并打开

SYS@kyeupdbfs> alter database mount;

Database altered.

SYS@kyeupdbfs> alter database open;

Database altered.

查阅trace

路径：/oracle/app/oracle/diag/rdbms/kyeupdbfs/kyeupdbfs/trace/kyeupdbfs_ora_13343.trc

查阅trace的另外方法 v$diag_info 视图

SYS@kyeupdbfs> select * from v$diag_info where name like '%Trace%';

   INST_ID NAME         VALUE
---------- -------------------- --------------------------------------------------
     1 Diag Trace       /oracle/app/oracle/diag/rdbms/kyeupdbfs/kyeupdbfs/
                trace

     1 Default Trace File   /oracle/app/oracle/diag/rdbms/kyeupdbfs/kyeupdbfs/
                trace/kyeupdbfs_ora_13343.trc