As it turns out, root cause for MEMORY_TARGET is due to configuration.
Setting SQL> alter system set memory_target=0 scope=spfile; was the initial work around, the better solution is to fix root cause.
From alert_+ASM.log 2017-10-09T11:50:19.746027+02:00 WARNING: You are trying to use the MEMORY_TARGET feature. This feature requires the /dev/shm file system to be mounted for at least 1073741824 bytes. /dev/shm is either not mounted or is mounted with available space less than this size. Please fix this so that MEMORY_TARGET can work as expected. Current available is 915083264 and used is 0 bytes. Ensure that the mount point is /dev/shm for this directory. -------------------------------------------------------------------------------- [oracle@db-asm-1 ~]$ df /dev/shm/ Filesystem 1K-blocks Used Available Use% Mounted on tmpfs 893636 0 893636 0% /dev/shm [oracle@db-asm-1 ~]$ -------------------------------------------------------------------------------- [oracle@db-asm-1 dinh]$ sqlplus / as sysasm SQL*Plus: Release 12.2.0.1.0 Production on Mon Oct 9 11:48:44 2017 Copyright (c) 1982, 2016, Oracle. All rights reserved. Connected to: Oracle Database 12c Enterprise Edition Release 12.2.0.1.0 - 64bit Production SQL> show parameter target NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ memory_max_target big integer 0 memory_target big integer 0 pga_aggregate_target big integer 10M sga_target big integer 0 SQL> show parameter size NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ db_cache_size big integer 24M large_pool_size big integer 12M max_dump_file_size string unlimited parallel_execution_message_size integer 16384 sga_max_size big integer 216M shared_pool_reserved_size big integer 8808038 shared_pool_size big integer 168M sort_area_size integer 65536 unified_audit_sga_queue_size integer 1048576 workarea_size_policy string AUTO SQL> alter system set memory_max_target=1G scope=spfile; System altered. SQL> shu immediate; ASM diskgroups dismounted ASM instance shutdown SQL> startup; ORA-00845: MEMORY_TARGET not supported on this system SQL> exit Disconnected from Oracle Database 12c Enterprise Edition Release 12.2.0.1.0 - 64bit Production [oracle@db-asm-1 dinh]$ -------------------------------------------------------------------------------- [root@db-asm-1 ~]# df -h /dev/shm/ Filesystem Size Used Avail Use% Mounted on tmpfs 873M 0 873M 0% /dev/shm [root@db-asm-1 ~]# mount -o remount,size=2G /dev/shm [root@db-asm-1 ~]# df -h /dev/shm/ Filesystem Size Used Avail Use% Mounted on tmpfs 2.0G 0 2.0G 0% /dev/shm [root@db-asm-1 ~]# vi /etc/fstab [root@db-asm-1 ~]# cat /etc/fstab # # /etc/fstab # Created by anaconda on Mon Apr 24 10:50:55 2017 # # Accessible filesystems, by reference, are maintained under '/dev/disk' # See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info # UUID=b33f8d74-4869-460a-9835-abcbf5e7fc19 / ext4 defaults 1 1 UUID=f6263370-a504-46e9-bb85-26e2400eafae swap swap defaults 0 0 /root/swapfile swap swap defaults 0 0 tmpfs /dev/shm tmpfs defaults,size=2G 0 0 devpts /dev/pts devpts gid=5,mode=620 0 0 sysfs /sys sysfs defaults 0 0 proc /proc proc defaults 0 0 /dev/vgora/lvora /u01 ext4 defaults 1 2 [root@db-asm-1 ~]# mount -a [root@db-asm-1 ~]# -------------------------------------------------------------------------------- [oracle@db-asm-1 dinh]$ sqlplus / as sysasm SQL*Plus: Release 12.2.0.1.0 Production on Mon Oct 9 11:54:43 2017 Copyright (c) 1982, 2016, Oracle. All rights reserved. Connected to an idle instance. SQL> startup; ASM instance started Total System Global Area 1073741824 bytes Fixed Size 8628936 bytes Variable Size 1039947064 bytes ASM Cache 25165824 bytes ASM diskgroups mounted SQL> show parameter target NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ memory_max_target big integer 1G memory_target big integer 0 pga_aggregate_target big integer 10M sga_target big integer 0 SQL> exit Disconnected from Oracle Database 12c Enterprise Edition Release 12.2.0.1.0 - 64bit Production [oracle@db-asm-1 dinh]$
