Oracle RACѧϰ±Ê¼Ç
Oracle RACѧϰ±Ê¼Ç
1. Introduction:
Cluster - ¶ÔÓû§À´Ëµ¶ą̀·þÎñÆ÷ºÃÏñÊÇһ̨·þÎñÆ÷Ò»Ñù¡£
Oracle Clusterware - OracleÌṩµÄ¼¯Èº½â¾ö·½°¸
Oracle RAC ¶à¸öʵÀý¶ÔÓ¦Ò»¸öÊý¾Ý¿â£¨Îļþ£©
Oracle Cluster Architecture: (Hardware)
Oracle RAC Á©¸ö×é¼þ£ºVoting DiskºÍOCR £¨Oracle Cluster Register£©
Voting Disk¼Ç¼½Úµã×éÔ±ÐÅÏ¢£¬OCR¼Ç¼¼¯ÈºÅäÖÃÐÅÏ¢¡£±ØÐë´æ·ÅÔÚ¹²Ïí´ÅÅÌÉÏ¡£
Oracle ClusterÒªÇó½ÚµãÖ®¼äÓÃ˽ÓÐÍøÂçÁ¬½Ó£¬½¨ÒéÔÚǧÕ×Íø¿¨ÉÏʹÓÃUDP
Oracle Cluster Processes: (Software)
CSS - ¿ØÖƽڵã×éÔ±ÐÅÏ¢£¬µ±¼ÓÈë½Úµã»ò½ÚµãÍ˳öʱ֪ͨ×éÔ± (init.cssd, ocssd, ocssd.bin)¡£ ½ø³ÌÒÔoracleÓû§ÔËÐС£
CRS - ¹ÜÀí¼¯Èº×ÊÔ´£¨database£¬instance,service,listener,VIP,application process£©, ()
×ÊÔ´ÐÅÏ¢´æ·ÅÔÚOCR, µ±ÕâЩ·þÎñ³öÏÖÎÊÌâʱ£¬CRS×Ô¶¯Æô¶¯ÕâЩ·þÎñ£¬µ±·þÎñ²úÉú¸Ä±ä
ʱ²úÉúʼþ¡£(crsd.bin) ½ø³ÌÒÔrootÓû§ÔËÐС£
EVM - ¹«²¼CRS²úÉúµÄʼþ (evmd,evmd.bin,evmlogger)
ONS - ·¢²¼/¶©ÔÄFAN£¨¿ìËÙÓ¦ÓÃ֪ͨ£©·þÎñ (ons)
RAGG - Ö§³ÖÌØÊâµÄÐèÇóºÍ¸´ÔÓµÄ×ÊÔ´¡£µ±ÓÐFANʼþʱÔËÐÐcall out ½Å±¾ (racgmain,racgimon)
OPRPCD - פÁôÔÚÄÚ´æÖУ¬¼à²â¼¯ÈººÍÌṩIO±£»¤¡£Èç¹û³¬¹ý¼ì²éʱ¼ä£¬½«ÖØÆô½Úµã¡£ÔÚlinuxƽ̨ʹÓÃhangcheck timer £¨oprocd£©
Oracle RAC Architecture: (Hardware)
¹²Ïí´ÅÅÌ´æ·Ådatafiles, control files, PFILEs, and redo log files, instancesÔÚͬһ¸öÍøÂç¶ÎÖÐ
ASM
OCFS
NETWORK file system
RAW
ÿ¸öinstanceÓÐ×Ô¼ºµÄÔÚÏßÈÕÖ¾ÎļþºÍundo tablespace
Services ¶¨ÒåÁËÓû§·ÃÎʵĹæÔòºÍÌØÐÔ£ºunique name£¬workload balancing£¬failover¡£
Oracle instance¿ÉÒÔͨ¹ýdefault IPºÍVIPÀ´·ÃÎÊ
VIP£ºÃ¿Ò»¸ö½ÚµãÓÐÒ»¸öVIP£¬Èç¹ûÒ»¸ö½Úµãfails£¬VIP×Ô¶¯Çл»µ½ÁíÒ»¸ö½ÚµãVIP
Oracle RAC Software Component£º
GCSºÍGESʹÓÃGRDά»¤blockµÄ״̬£¬GRDµÄÄÚÈݱ»·Ö·¢µ½instances
Cache Fusion£ºÔÚinstances¼äͬ²½data blockÄÚÈÝ
LMS£ºGlobal Cache Service process
LMD£ºGlobal Enqueue Service Daemon
LMON: Global Enqueue Service Monitor
LCK0: Instance Enqueue Process
Oracle RAC workload management:
¹ÜÀíworkload distribution£¬²¢¸øÓû§ºÍÓ¦ÓÃÌṩÓÅ»¯µÄÐÔÄÜ
¸ß¿ÉÓÃÐÔµÄÊý¾Ý¿âÁª½Ó£¬¿ìËÙfailover»Ö¸
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[root@GISDB ~]$ su - oracle
[oracle@GISDB ~]$ sqlplus /nolog
SQL*Plus: Release 10.2.0.4.0 - Production on Tue Oct 13 11:03:03 2009
Copyright (c) 1982, 2007, Oracle. All Rights Reserved.
SQL> conn /as sysdba
Connected to an idle instance.
SQL> startup
ORACLE instance started.
To ......
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Update SQLS will lead dead lock exception. Because by default, it use optimistic lock but not pessimistic lock.
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Optimistic locking offers an elegant solution to the problems o ......