ORA-15003 Diskgroup "DATA" Already Mounted in Another Lock Name Space
(Doc ID 1531734.1)
Last updated on MARCH 10, 2021
Applies to:Oracle Database - Enterprise Edition - Version 126.96.36.199 and later
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Backup Service - Version N/A and later
Information in this document applies to any platform.
1. ASM diskgroups in single instance environment will not be mounted with the following similar error in sqlplus screen.
SQL> alter diskgroup DATA mount;
alter diskgroup DATA mount
ORA-15017 diskgroup DATA cannot be mounted
ORA-15003 diskgroup DATA already mounted in another lock name space
2. Heartbeat detection error is seen In ASM alert.log,
SQL> alter diskgroup DATA mount
NOTE: cache registered group DATA number=1 incarn=0x3866aca2
NOTE: cache began mount (first) of group DATA number=1 incarn=0x3866aca2
Mon Nov 03 15:11:31 2012
NOTE: Assigning number (1,0) to disk (/dev/asm/data1)
NOTE: Assigning number (1,1) to disk (/dev/asm/data2)
Mon Nov 03 15:11:38 2012
ERROR: PST found another heartbeat (grp 1) <<<<<<--- Heartbeat detected.
NOTE: cache dismounting (clean) group 11/0x3866ACA2 (DATA)
NOTE: dbwr not being msg'd to dismount
NOTE: lgwr not being msg'd to dismount
NOTE: cache dismounted group 1/0x3866ACA2 (DATA)
NOTE: cache ending mount (fail) of group DATA number=1 incarn=0x3866aca2
NOTE: De-assigning number (1,0) from disk (/dev/asm/data1)
NOTE: De-assigning number (1,1) from disk (/dev/asm/data2)
ERROR: diskgroup DATA was not mounted
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