Oracle architecture and backup (17th) -- BG-others

1. Other processes

 

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.

 

 

Example 2

[Oracle @ localhost desktop] $ PS-Ef | grep ora _ | grep arc [Oracle @ localhost desktop] $ sqlplus/As sysdba; SQL * Plus: release 10.2.0.1.0-production on Thu Jun 6 11:21:32 2013 copyright (c) 1982,200 5, Oracle. all rights reserved. connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.1.0-productionwith the partitioning, OLAP and Data Mining optionssql> select log_mode from V $ database; log_mode ----- ------- Noarchivelogsql> shutdown immediate; database closed. database dismounted. oracle instance shut down. SQL> startup mountoracle instance started. total system global area 838860800 bytesfixed size 1222192 bytesvariable size 788531664 bytesdatabase buffers 46137344 bytesredo buffers 2969600 bytesdatabase mounted. SQL> alter database archivelog; database altered. SQL> alter database open; database alte Red. SQL> select log_mode from V $ database; LOG_MODE------------ARCHIVELOGSQL> exit; disconnected from Oracle Database 10g Enterprise Edition Release 10.2.0.1.0-productionwith the partitioning, OLAP and Data Mining options [Oracle @ localhost desktop] $ PS-Ef | grep ora _ | grep arcoracle 6644 1 0? 00:00:00 ora_arc0_orcloracle 6646 1 0? 00:00:00 ora_arcw.orcloracle 6648 1 0? 00:00:00 ora_arc2_orclsql> show parameter log_archive_name type value =----------- export log_archive_config stringlog_archive_dest stringlog_archive_dest_1 too many minutes when creating stringlog _ Archive_dest_8 stringname type value =-------------------------------------- log_archive_dest_9 stringlog_archive_dest_state_1 string =string =strin G required string character string enablename type value character ----------- character log_archive_duplex_dest stringlog_archive_format string % T _ % S _ % R. dbflog_archive_local_first Boolean comment integer 1_integer 1log_arc Hive_start Boolean falselog_archive_trace integer 0sql> 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-productionwith the partitioning, OLAP and Data Mining options [Oracle @ localhost desktop] $ PS-Ef | grep ora _ | grep arcoracle 6644 1 0? 00:00:00 ora_arc0_orcloracle 6646 1 0? 00:00:00 ora_arcw.orcloracle 6648 1 0? 00:00:00 ora_arc2_orcl [Oracle @ localhost desktop] $ sqlplus/As sysdba; SQL * Plus: Release 10.2.0.1.0-production on Thu Jun 6 11:24:42 2013 copyright (c) 1982,200 5, Oracle. all rights reserved. connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.1.0-productionwith the partitioning, OLAP and Data Mining optionssql> alter system switch logfile; System altered. SQL> exit; disconnected from Oracle Database 10g Enterprise Edition Release 10.2.0.1.0-productionwith the partitioning, OLAP and Data Mining options [Oracle @ localhost desktop] $ sqlplus/As sysdba; SQL * Plus: release 10.2.0.1.0-production on Thu Jun 6 11:24:59 2013 copyright (c) 1982,200 5, Oracle. all rights reserved. connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.1.0-productionwith the partitioning, OLAP and Data Mining optionssql> alter system set log_archive_max_processes = 32; alter system set errors = 32 * error at line 1: ORA-00068: invalid value 32 for parameter log_archive_max_processes, must bebetween 1 and 30sql> alter system set log_archive_max_processes = 30; System altered. SQL> alter system set log_archive_max_processes = 2; System altered.

Summary

 

1. Other processes include arcn, reco, dnnn, and LMS;

2. the archiving process is valid in archive mode;

3. You can dynamically adjust the size of the archiving process, but cannot exceed 30.

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