Oracle体系结构及备份（十七）——bg-others
一 其他进程
Archiver (ARCn)
Oneor more archiver processes copy the redo log files to archival storage whenthey are full or a log switch occurs.
Recoverer (RECO)
The recoverer process is used to resolvedistributed transactions that are pending because of a network or systemfailure in a distributed database. At timed intervals, the local RECO attemptsto connect to remote databases and automatically complete the commit or rollbackof the local portion of any pending distributed transactions.
Dispatcher (Dnnn)
Dispatchers are optional backgroundprocesses, present only when the shared server configuration is used.
Global Cache Service (LMS)
In an Oracle Real Application Clustersenvironment, this process manages resources and provides inter-instanceresource control.
二 操作示例
[oracle@localhost 桌面]$ ps -ef | grep ora_ | grep arc [oracle@localhost 桌面]$ sqlplus / as sysdba; SQL*Plus: Release 10.2.0.1.0 - Production on Thu Jun 6 11:21:32 2013 Copyright (c) 1982, 2005, Oracle. All rights reserved. Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production With the Partitioning, OLAP and Data Mining options SQL> select log_mode from v$database; LOG_MODE ------------ NOARCHIVELOG SQL> shutdown immediate; Database closed. Database dismounted. ORACLE instance shut down. SQL> startup mount ORACLE instance started. Total System Global Area 838860800 bytes Fixed Size 1222192 bytes Variable Size 788531664 bytes Database Buffers 46137344 bytes Redo Buffers 2969600 bytes Database mounted. SQL> alter database archivelog; Database altered. SQL> alter database open; Database altered. SQL> select log_mode from v$database; LOG_MODE ------------ ARCHIVELOG SQL> exit; Disconnected from Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production With the Partitioning, OLAP and Data Mining options [oracle@localhost 桌面]$ ps -ef | grep ora_ | grep arc oracle 6644 1 0 11:22 ? 00:00:00 ora_arc0_orcl oracle 6646 1 0 11:22 ? 00:00:00 ora_arc1_orcl oracle 6648 1 0 11:22 ? 00:00:00 ora_arc2_orcl SQL> show parameter log_archive_ NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ log_archive_config string log_archive_dest string log_archive_dest_1 string log_archive_dest_10 string log_archive_dest_2 string log_archive_dest_3 string log_archive_dest_4 string log_archive_dest_5 string log_archive_dest_6 string log_archive_dest_7 string log_archive_dest_8 string NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ log_archive_dest_9 string log_archive_dest_state_1 string enable log_archive_dest_state_10 string enable log_archive_dest_state_2 string enable log_archive_dest_state_3 string enable log_archive_dest_state_4 string enable log_archive_dest_state_5 string enable log_archive_dest_state_6 string enable log_archive_dest_state_7 string enable log_archive_dest_state_8 string enable log_archive_dest_state_9 string enable NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ log_archive_duplex_dest string log_archive_format string %t_%s_%r.dbf log_archive_local_first boolean TRUE log_archive_max_processes integer 2 log_archive_min_succeed_dest integer 1 log_archive_start boolean FALSE log_archive_trace integer 0 SQL> alter system set log_archive_max_processes = 2; System altered. SQL> exit; Disconnected from Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production With the Partitioning, OLAP and Data Mining options [oracle@localhost 桌面]$ ps -ef | grep ora_ | grep arc oracle 6644 1 0 11:22 ? 00:00:00 ora_arc0_orcl oracle 6646 1 0 11:22 ? 00:00:00 ora_arc1_orcl oracle 6648 1 0 11:22 ? 00:00:00 ora_arc2_orcl [oracle@localhost 桌面]$ sqlplus / as sysdba; SQL*Plus: Release 10.2.0.1.0 - Production on Thu Jun 6 11:24:42 2013 Copyright (c) 1982, 2005, Oracle. All rights reserved. Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production With the Partitioning, OLAP and Data Mining options SQL> alter system switch logfile; System altered. SQL> exit; Disconnected from Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production With the Partitioning, OLAP and Data Mining options [oracle@localhost 桌面]$ sqlplus / as sysdba; SQL*Plus: Release 10.2.0.1.0 - Production on Thu Jun 6 11:24:59 2013 Copyright (c) 1982, 2005, Oracle. All rights reserved. Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production With the Partitioning, OLAP and Data Mining options SQL> alter system set log_archive_max_processes=32; alter system set log_archive_max_processes=32 * ERROR at line 1: ORA-00068: invalid value 32 for parameter log_archive_max_processes, must be between 1 and 30 SQL> alter system set log_archive_max_processes=30; System altered. SQL> alter system set log_archive_max_processes=2; System altered.
三 总结
1.其他进程包括ARCn、RECO、Dnnn、LMS；
2.归档进程在归档模式下有效；
3.可以动态调整归档进程的大小，但不能超过30。
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