oracle12.2 asm进程,Oracle ASM 进程之ASMB

港控/mmm° 2023-01-18 06:58 98阅读 0赞

在ASM alert日志看到一段话

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该进程的作用，以下摘录来自

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的后台进程

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\_

以下简单介绍各个进程的作用

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.

oracle12.2 asm进程,Oracle ASM 进程之ASMB

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