SqlClear清除数据库日志

SqlClear清除数据库日志时出现磁盘空间不足无法打开数据库的对话框导致无法清除，由于没时间整理磁盘，先问问出现此状况的原因有哪些

1、数据库不能启动

SQL> startup
ORACLE 例程已经启动。

Total System Global Area 289406976 bytes
Fixed Size 1248576 bytes
Variable Size 83886784 bytes
Database Buffers 197132288 bytes
Redo Buffers 7139328 bytes
数据库装载完毕。
ORA-16038: 日志 2 序列号 44 无法归档
ORA-19809: 超出了恢复文件数的限制
ORA-00312: 联机日志 2 线程 1:
'D:\ORACLE\PRODUCT\10.2.0\ORADATA\ORCL\REDO02.LOG'

2、查看$ORACLE_HOME\admin\SID\bdump\alert_SID.log日志

Thu Feb 19 09:45:33 2009
Errors in file d:\oracle\product\10.2.0\admin\orcl\bdump\orcl_arc1_660.trc:
ORA-19815: WARNING: db_recovery_file_dest_size of 2147483648 bytes is 99.95% used, and has 1129472 remaining bytes available.

Thu Feb 19 09:45:33 2009
Errors in file d:\oracle\product\10.2.0\admin\orcl\udump\orcl_ora_4708.trc:
ORA-19815: 警告: db_recovery_file_dest_size 字节 (共 2147483648 字节) 已使用 99.95%, 尚有 1129472 字节可用。

Thu Feb 19 09:45:33 2009
************************************************************************
You have following choices to free up space from flash recovery area:
1. Consider changing RMAN RETENTION POLICY. If you are using Data Guard,
Thu Feb 19 09:45:33 2009
************************************************************************
then consider changing RMAN ARCHIVELOG DELETION POLICY.
2. Back up files to tertiary device such as tape using RMAN
You have following choices to free up space from flash recovery area:
BACKUP RECOVERY AREA command.
3. Add disk space and increase db_recovery_file_dest_size parameter to
1. Consider changing RMAN RETENTION POLICY. If you are using Data Guard,
reflect the new space.
then consider changing RMAN ARCHIVELOG DELETION POLICY.
4. Delete unnecessary files using RMAN DELETE command. If an operating
system command was used to delete files, then use RMAN CROSSCHECK and
2. Back up files to tertiary device such as tape using RMAN
DELETE EXPIRED commands.
************************************************************************
BACKUP RECOVERY AREA command.
Thu Feb 19 09:45:34 2009
Errors in file d:\oracle\product\10.2.0\admin\orcl\bdump\orcl_arc1_660.trc:
ORA-19809: limit exceeded for recovery files
ORA-19804: cannot reclaim 44217856 bytes disk space from 2147483648 limit

从上面信息知道是flash recovery area闪回恢复空间中默认2G的空间被归档日志占满了，没有空间进行存放归档日志。

3、退出sqlplus,进入rman

SQL> exit
从 Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, OLAP and Data Mining options 断开

C:\Documents and Settings\mengzhaoliang>rman target/

恢复管理器: Release 10.2.0.1.0 - Production on 星期四 2月 19 09:57:48 2009

Copyright (c) 1982, 2005, Oracle. All rights reserved.

已连接到目标数据库: ORCL (DBID=1193443472, 未打开)

4、查看归档日志
RMAN> list archivelog all;

使用目标数据库控制文件替代恢复目录

已存档的日志副本列表
关键字 Thrd Seq S 短时间 名称
------- ---- ------- - ---------- ----
40 1 1 A 17-11月-08 D:\ORACLE\PRODUCT\10.2.0\FLASH_RECOVERY_AREA\O
RCL\ARCHIVELOG\2008_11_18\O1_MF_1_1_4L44Z9CQ_.ARC
41 1 2 A 18-11月-08 D:\ORACLE\PRODUCT\10.2.0\FLASH_RECOVERY_AREA\O
RCL\ARCHIVELOG\2008_11_18\O1_MF_1_2_4L4W4O0H_.ARC
42 1 3 A 18-11月-08 D:\ORACLE\PRODUCT\10.2.0\FLASH_RECOVERY_AREA\O

5、可以先把归档日志备份到其他的空间，然后用rman删除归档日志；

RMAN> delete archivelog all;

释放的通道: ORA_DISK_1
分配的通道: ORA_DISK_1
通道 ORA_DISK_1: sid=151 devtype=DISK

已存档的日志副本列表
关键字 Thrd Seq S 短时间 名称
------- ---- ------- - ---------- ----
40 1 1 A 17-11月-08 D:\ORACLE\PRODUCT\10.2.0\FLASH_RECOVERY_AREA\O
RCL\ARCHIVELOG\2008_11_18\O1_MF_1_1_4L44Z9CQ_.ARC
是否确定要删除以上对象 (输入 YES 或 NO)? yes
已删除的存档日志
存档日志文件名 =D:\ORACLE\PRODUCT\10.2.0\FLASH_RECOVERY_AREA\ORCL\ARCHIVELOG\200
_11_18\O1_MF_1_1_4L44Z9CQ_.ARC 记录 ID=40 时间戳 =671101294

6、退出rman，进入sqlplus,打开数据库

RMAN> exit

恢复管理器完成。

C:\Documents and Settings\mengzhaoliang>sqlplus "/as sysdba"

SQL*Plus: Release 10.2.0.1.0 - Production on 星期四 2月 19 10:03:02 2009

Copyright (c) 1982, 2005, Oracle. All rights reserved.

连接到:
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, OLAP and Data Mining options

SQL> alter database open;

数据库已更改。

数据库已经打开！

你好：根据你说得就是你每次关于软件应用得数据、工作情况、都保存倒了数据库里 所以造成这种情况 你可以尽快清理一下没必要得数据和日志， 如果对你有帮助，望采纳。