在ASM alert日志看到一段話?
引用 Fri Mar? 5 00:03:10 2010?
Starting background process ASMB?
ASMB started with pid=13, OS id=42068?
Fri Mar? 5 00:06:19 2010?
NOTE: ASMB process exiting due to lack of ASM file activity
于是初步研究了一下該進程的作用，以下摘錄來自?
http://www.dbasupport.com/oracle/ora10g/ASM01.shtml?
引用 Every database instance that uses ASM for file storage will also need two new processes. The Rebalancer background process (RBAL) handles global opens of all ASM disks in the ASM Disk Groups, while the ASM Bridge process (ASMB) connects as a foreground process into the ASM instance when the regular database instance starts. ASMB facilitates communication between the ASM instance and the regular database, including handling physical file changes like data file creation and deletion.?

ASMB exchanges messages between both servers for statistics update and instance health validation. These two processes are automatically started by the database instance when a new Oracle file type - for example, a tablespace's datafile -- is created on an ASM disk group. When an ASM instance mounts a disk group, it registers the disk group and connect string with Group Services. The database instance knows the name of the disk group, and can therefore use it to locate connect information for the correct ASM instance.

附rdbms、asm instance的后臺進程?
引用 $ ps -ef|grep asmdb?
? oracle? 7534???? 1?? 0 00:03:16????? -? 0:00 ora_rbal_asmdb?
? oracle 14186???? 1?? 0 00:44:53????? -? 0:00 ora_o000_asmdb?
? oracle 15268???? 1?? 0 00:03:12????? -? 0:00 ora_reco_asmdb?
? oracle 16016???? 1?? 0 00:03:12????? -? 0:02 ora_smon_asmdb?
? oracle 22202???? 1?? 0 00:03:12????? -? 0:01 ora_mmnl_asmdb?
? oracle 22492???? 1?? 0 00:03:12????? -? 0:03 ora_mmon_asmdb?
? oracle 23238???? 1?? 0 00:03:12????? -? 0:01 ora_ckpt_asmdb?
? oracle 26366???? 1?? 0 00:03:13????? -? 0:00 ora_s000_asmdb?
? oracle 26658???? 1?? 0 00:03:12????? -? 0:00 ora_d000_asmdb?
? oracle 30206???? 1?? 0 00:03:11????? -? 0:00 ora_dbw0_asmdb?
? oracle 30734???? 1?? 0 00:03:11????? -? 0:00 ora_mman_asmdb?
? oracle 35138???? 1?? 0 00:03:11????? -? 0:00 ora_psp0_asmdb?
? oracle 36398???? 1?? 0 00:03:36????? -? 0:00 ora_qmnc_asmdb?
? oracle 36646???? 1?? 0 00:03:11????? -? 0:00 ora_pmon_asmdb?
? oracle 38926???? 1?? 0 00:03:19????? -? 0:00 ora_o001_asmdb?
? oracle 40296???? 1?? 0 00:03:12????? -? 0:00 ora_lgwr_asmdb?
? oracle 41306???? 1?? 0 00:03:16????? -? 0:00 ora_asmb_asmdb?
? oracle 41814???? 1?? 0 00:03:12????? -? 0:05 ora_cjq0_asmdb?
? oracle 42628 21640?? 0 00:46:18? pts/2? 0:00 grep asmdb?
? oracle 43624???? 1?? 0 00:03:46????? -? 0:00 ora_q001_asmdb?
? oracle 43864???? 1?? 0 00:03:46????? -? 0:00 ora_q000_asmdb?
$ ps -ef|grep asm_?
? oracle 10868???? 1?? 0 23:47:53????? -? 0:00 asm_smon_+ASM?
? oracle 12690???? 1?? 0 23:47:53????? -? 0:00 asm_rbal_+ASM?
? oracle 15494???? 1?? 0 23:47:53????? -? 0:00 asm_dbw0_+ASM?
? oracle 17320???? 1?? 0 23:47:53????? -? 0:00 asm_gmon_+ASM?
? oracle 29354???? 1?? 0 23:47:52????? -? 0:00 asm_mman_+ASM?
? oracle 31422???? 1?? 0 23:47:52????? -? 0:00 asm_psp0_+ASM?
? oracle 31506???? 1?? 0 23:47:52????? -? 0:00 asm_pmon_+ASM?
? oracle 32776???? 1?? 0 23:47:53????? -? 0:00 asm_lgwr_+ASM?
? oracle 34576???? 1?? 0 23:47:53????? -? 0:00 asm_ckpt_+ASM?
? oracle 40514???? 1?? 0 00:03:10????? -? 0:00 asm_o000_+ASM?
? oracle 42630 21640?? 0 00:46:24? pts/2? 0:00 grep asm_
以下簡單介紹各個進程的作用?
引用 ARBx?These are the slave processes that do the rebalance activity (where x?
is a number).?
CKPT?The CKPT process manages cross-instance calls (in RAC).?
DBWR?This process manages the SGA buffer cache in the ASM instance.?
DBWR writes out dirty buffers (changed metadata buffers) from the ASM?
buffer cache to disk.?
GMON?This process is responsible for managing the disk-level activities?
(drop/offline) and advancing diskgroup compatibility.?
KATE?The Konductor or ASM Temporary Errands (KATE) process is used?
to process disks online. This process runs in the ASM instance and is started?
only when an offlined disk is onlined.?
LGWR?The LGWR process maintains the ASM Active Change Directory?
(ACD) buffers from the ASM instance and flushes ACD change records to?
disk.?
MARK?The Mark Allocation Unit (AU) for Resync Koordinator (MARK)?
process coordinates the updates to the Staleness Registry when the disks go?
offline. This process runs in the RDBMS instance and is started only when?
disks go offline in ASM redundancy diskgroups.?
PING?The PING process measures network latency and has the same?
functionality in RDBMS instances.?
PMON?This manages processes and process death in the ASM instance.?
PSP0?This process spawner process is responsible for creating and?
managing other Oracle processes.?
PZ9x?These processes are parallel slave processes (where x is a number),?
used in fetching data on behalf of GV$ queries.?
RBAL?This opens all device files as part of discovery and coordinates the?
rebalance activity.?
SMON?This process is the system monitor and also acts as a liaison to the?
Cluster Synchronization Services (CSS) process (in Oracle Clusterware) for?
node monitoring.?
VKTM?This process is used to maintain the fast timer and has the same?
functionality in the RDBMS instances.

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