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Connecting and Starting Up an Oracle ASM Instance


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How to Connect to an ASM Instance

set ORACLE_SID environment variable to the Oracle ASM system identifier (SID).
You can find ASM SID using ps command
$ps -ef|grep pmon |grep asm
oragrid  30609     1  0 Jun08 ?        00:00:21 asm_pmon_+ASM
export ORACLE_SID=+ASM
set ORACLE_HOME environment variable to the Grid Infrastructure home where Oracle ASM was installed
$ps -ef|grep crs
oragrid   5421     1  0 Jun05 ?        00:00:14 /u01/oragrid/12.2.0.1/grid/bin/tnslsnr LISTENER -no_crs_notify -inherit
$export ORACLE_HOME=/u01/oragrid/12.2.0.1/grid
$export PATH=$PATH:$ORACLE_HOME/bin

How to Start ASM Instance

logina s sysasm
$sqlplus "/as sysasm"
Startup
SQL>startup


Starting Up an Oracle ASM instance with an Incorrect SPFILE Path

locate the spfile 
/u01/oragrid/spfile/spfileASM.ora
Create pfile from spfile
SQL> create pfile='/u01/oragrid/spfile/ASM.ora' from spfile='/u01/oragrid/spfile/spfileASM.ora';
Startup ASM instance with PFILE
SQL> startup pfile='/u01/oragrid/spfile/ASM.ora'
Update the spfile path to point the spfile
$asmcmd spset /u01/oragrid/spfile/spfileASM.ora

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