在有些特殊场景下,需要手动重启oracle arch processes,而不是重启db。举例来说,DB的状态正常,但是归档进程由于某些原因 挂起,此时我们就需要重启oracle 归档进程。
在9i中,我们可以使用如下命令来启动和停止归档进程
alter system archive log stop;
alter system archive log start;
在9i中,关于启动和停止oracle 归档进程的说明
http://docs.oracle.com/cd/B10501_01/server.920/a96521/archredo.htm#4812
在10g中,关于启动和停止oracle 归档进程的说明
http://docs.oracle.com/cd/B19306_01/server.102/b14357/ch12007.htm
在11g中,并没有启动和停止oracle归档进程的说明
http://docs.oracle.com/cd/E11882_01/server.112/e16604/ch_twelve007.htm
通过官方文档的对其的描述,在9i和10g版本中是可以手动启动和停止归档进程(没有测试环境,未验证)
在11g中,官方文档中虽然废除了手动启动和停止归档进程的命令,但是经过测试 发现,
该命令仍然可以正常执行,但是实际上该命令并没有奏效。测试过程如下
--当前oracle版本
>select*fromv$versionwhererownum<2;
BANNER
--------------------------------------------------------------------------------
OracleDatabase11g Enterprise EditionRelease11.2.0.4.0-64bit Production
--开启归档模式
>archiveloglist
DatabaselogmodeNo ArchiveMode
Automaticarchival Disabled
Archive destination/s01/oracle/app/oracle/product/11.2.0.4/dbhome_1/dbs/arch
Oldestonlinelogsequence36
Currentlogsequence38
>shutdownimmediate
Databaseclosed.
Databasedismounted.
ORACLE instance shut down.
>startupmount
ORACLE instance started.
Total System Global Area 839282688 bytes
FixedSize2257880 bytes
VariableSize503319592 bytes
DatabaseBuffers 331350016 bytes
Redo Buffers 2355200 bytes
Databasemounted.
>altersystemsetlog_archive_dest_1='LOCATION=/arch';
System altered.
Elapsed:00:00:00.03
>alterdatabasearchivelog;
Databasealtered.
Elapsed:00:00:00.00
>archiveloglist
DatabaselogmodeArchiveMode
Automaticarchival Enabled
Archive destination/arch
Oldestonlinelogsequence36
Nextlogsequencetoarchive 38
Currentlogsequence38
>alterdatabaseopen;
--进行redo日志的切换
>altersystem switch logfile;
--查看当前的归档进程状态
>select*fromv$archive_processes;
PROCESS STATUS LOG_SEQUENCE STAT ROLES
---------- ---------- ------------ ---- ------------------------------------
0 ACTIVE 0 IDLE
1 ACTIVE 0 IDLE NO_FAL NO_SRL
2 ACTIVE 0 IDLE HEART_BEAT
3 ACTIVE 0 IDLE
4 STOPPED 0 IDLE
......
此处输出结果内容较多,省略一部分。
[oracle@uumile arch]$ ps -ef | grep ora_ar
oracle 3054 1 0 22:44 ? 00:00:00 ora_arc0_test
oracle 3058 1 0 22:44 ? 00:00:00 ora_arc1_test
oracle 3062 1 0 22:44 ? 00:00:00 ora_arc2_test
oracle 3066 1 0 22:44 ? 00:00:00 ora_arc3_test
oracle 3262 3228 0 23:11 pts/1 00:00:00 grep ora_ar
--查看当前最大的归档进程数
>sho parametermax
NAMETYPEVALUE
------------------------------------ ----------- ------------------------------
log_archive_max_processesinteger4
--停止arch processes,下面我们来手动停止arch process
>altersystem archivelogstop;
System altered.
Elapsed:00:00:00.00
#此处我们可以看到,命令没有问题
--检查arch processes状态
>select*fromv$archive_processes;
PROCESS STATUS LOG_SEQUENCE STAT ROLES
---------- ---------- ------------ ---- ------------------------------------
0 ACTIVE 0 IDLE
1 ACTIVE 0 IDLE NO_FAL NO_SRL
2 ACTIVE 0 IDLE HEART_BEAT
3 ACTIVE 0 IDLE
4 STOPPED 0 IDLE
[oracle@uumile arch]$ps-ef|grep ora_ar
oracle 3054 1 0 22:44?00:00:00 ora_arc0_test
oracle 3058 1 0 22:44?00:00:00 ora_arc1_test
oracle 3062 1 0 22:44?00:00:00 ora_arc2_test
oracle 3066 1 0 22:44?00:00:00 ora_arc3_test
oracle 3262 3228 0 23:11 pts/1 00:00:00 grep ora_ar
--启动arch process
>altersystem archivelogstart;
System altered.
Elapsed:00:00:00.01
sys@TEST(127.0.0.1)>!ps-ef|grep arc
oracle 3054 1 0 22:44?00:00:00 ora_arc0_test
oracle 3058 1 0 22:44?00:00:00 ora_arc1_test
oracle 3062 1 0 22:44?00:00:00 ora_arc2_test
oracle 3066 1 0 22:44?00:00:00 ora_arc3_test
oracle 3267 2959 0 23:12 pts/1 00:00:00/bin/bash-c ps-ef|grep arc
总结
通过上面的测试,可以得出结论,alter system archive log stop/start在9i 或者10g中是可以执行和生效的。
在11g中,alter system archive log start/stop 语法和命令没有问题,但是命令并没有真正生效。
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