sqlplus

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[oracle@localhost ~]$ sqlplus / as sysdba

[oracle@localhost ~]$ sqlplus /nolog
SQL> connect / as sysdba
Connected.

set linesize 500
set pagesize 200

SQL> / 执行上一条sql语句

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[oracle@localhost ~]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.1.0 Production on Mon May 20 14:16:35 2024

Copyright (c) 1982, 2009, Oracle.  All rights reserved.


Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup nomount
ORACLE instance started.

Total System Global Area 3190132736 bytes
Fixed Size		    2217584 bytes
Variable Size		 1694501264 bytes
Database Buffers	 1476395008 bytes
Redo Buffers		   17018880 bytes
SQL> alter database mount;

Database altered.

SQL> alter database open;

Database altered.

SQL> alter database close;

Database altered.

SQL> alter database dismount;

Database altered.

SQL> shutdown;
ORA-01507: database not mounted


ORACLE instance shut down.
SQL>

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SELECT * FROM v$diag_info;

INST_ID|NAME                 |VALUE                                                    |
-------+---------------------+---------------------------------------------------------+
      1|Diag Enabled         |TRUE                                                     |
      1|ADR Base             |/data/oracle                                             |
      1|ADR Home             |/data/oracle/diag/rdbms/orcl/orcl                        |
      1|Diag Trace           |/data/oracle/diag/rdbms/orcl/orcl/trace                  |
      1|Diag Alert           |/data/oracle/diag/rdbms/orcl/orcl/alert                  |
      1|Diag Incident        |/data/oracle/diag/rdbms/orcl/orcl/incident               |
      1|Diag Cdump           |/data/oracle/diag/rdbms/orcl/orcl/cdump                  |
      1|Health Monitor       |/data/oracle/diag/rdbms/orcl/orcl/hm                     |
      1|Default Trace File   |/data/oracle/diag/rdbms/orcl/orcl/trace/orcl_ora_6086.trc|
      1|Active Problem Count |1                                                        |
      1|Active Incident Count|4                                                        |
      
      
[oracle@localhost ~]$ tail 20 /data/oracle/diag/rdbms/orcl/orcl/trace/alert_orcl.log

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SQL> alter session set events 'immediate trace name controlf level 8';

Session altered.

SQL> select value from v$diag_info where name='Default Trace File';

VALUE
--------------------------------------------------------------------------------
/data/oracle/diag/rdbms/orcl/orcl/trace/orcl_ora_6591.trc

SQL>