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If your CSS instance wasn t started, you ll see the following error when you try to create your ASM instance:
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ORA-29701: unable to connect to Cluster Manager
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If this happens, simply start up the CSS daemon as explained in the ASM and Cluster Synchronization Service section earlier in this chapter, and then start up the ASM instance as shown in Listing 17-4.
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Listing 17-4. Starting an ASM Instance [finance] $ export ORACLE_SID=+ASM [+ASM] $ sqlplus /nolog SQL*Plus: Release 11.1.0.6.0 - Production on Thu Apr 10 09:21:48 2008 Copyright (c) 1982, 2007, Oracle. All rights reserved.
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SQL> CONNECT Connected to SQL> STARTUP ASM instance
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/ AS SYSDBA an idle instance. PFILE=initasm+.ora started
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CHAPTER 17 A UTOMA TIC M ANA GEMEN T AND ONLINE C APAB ILITIES
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Total System Global Area 79691776 Fixed Size 1216820 Variable Size 53309132 ASM Cache 25165824 ORA-15110: no diskgroups mounted SQL>
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Note the new SGA component, ASM Cache, which is sized at about 25MB. In most cases, the total SGA memory allocated to the entire ASM instance remains small, usually less than 100MB. In the preceding example, we also ended up with the ORA-15110 error, because the disk groups specified in the init.ora file don t exist yet, and the new instance can t mount them. We ll create the disk groups later on and then mount them with the ALTER DISKGROUP . . . MOUNT command. You can avoid the error message by taking out the ASM_DISKGROUPS parameter from the initialization parameter file.
Tip
Once you create an ASM instance, you must set the ORACLE_SID environment variable for the ASM instance before you can connect to it, just as you would do for a normal Oracle database instance. The default ASM instance name is +ASM.
You can confirm the name of your new ASM instance with the following query: SQL> SELECT instance_name FROM v$instance; INSTANCE_NAME ---------------+ASM SQL> If you run the LSNRCTL STATUS command from the command line, you ll see that the listener has automatically registered the new ASM instance: Service "+ASM" has one instance(s). You can check the newly created ASM instance processes in the following way: [+ASM] $ ps ef | grep asm oracle 3201 1 0 Jul 3 (LOCAL=YES) (ADDRESS=(PROTOCOL=beq))) oracle 11977 1 0 12:56 oracle 11979 1 0 12:56 oracle 11981 1 0 12:56 oracle 11985 1 0 12:56 oracle 11973 1 1 12:56 oracle 11987 1 0 12:56 oracle 11989 1 0 12:56 oracle 11991 1 0 12:56 oracle 11995 1 0 12:56 [+ASM] $ 0:00:00 oracleasm+ (DESCRIPTION = 0:00: 0:00: 0:00: 0:00: 0:00: 0:00: 0:00: 0:00: 0:00: 05 02 02 02 02 03 02 02 02 asm_pmon_+asm asm_psp0_+asm asm_mman_+asm asm_dbw0_+asm asm_lgwr_+asm asm_ckpt_+asm asm_smon_+asm asm_rbal_+asm asm_gmon_+asm
All the background processes shown in the preceding output are standard Oracle Database 11g processes, with the exception of a couple of background processes specific to an ASM instance. The following section explains the important ASM-specific background processes.
CH A PT ER 1 7 A UTO MA TI C MAN AGEM ENT AN D O NLI NE CAPA BILI TI ES
Tip You don t need to back up an ASM database, since you don t have any physical ASM datafiles to back up! This is also why you can t use the OPEN option while starting an ASM instance. All ASM metadata is either stored in the SGA while the ASM instance is running or stored on the disk groups and mirrored, to provide high availability.
Examining an ASM Instance s Architecture
An ASM instance uses several regular Oracle background processes, such as SMON, PMON, and LGWR. In addition, ASM utilizes two new ones: ASM rebalance master (RBAL) and ASM rebalance (ARBn). The RBAL process coordinates disk activity, and the ARBn processes perform the rebalancing work, which can include moving data extents. In addition to ASM s RBAL and ARBn, any Oracle database instance that uses ASM will have two ASM-related background processes: RBAL and ASM background (ASMB). RBAL performs global opens of the disks that are part of the ASM disk group, and ASMB connects to the ASM instance as a foreground process and links the ASM instance and your database instance, sending information such as notifications when a datafile is created or deleted, and when statistics are updated. You can use the OEM Database Control to manage an ASM instance. Its main page shows your ASM instance s status. From here, click the Configuration tab to visit the ASM Configuration page, where you can modify the ASM instance s parameters. You can also go to the ASM main page and check your instance s performance. Let s review the manual ASM startup and shutdown procedures.
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