Thursday, May 25, 2017

Configuring Oracle ASM Filter Driver (ASMFD) and Labelling Disks

If you already have and above GI/RAC installation and you want to migrate to ASMFD, click here.

Starting, downloaded Grid Infrastructure (GI) software zip is extracted directly in to the directly we have already chosen as ORACLE_HOME for GI. After extraction, we execute $ORACLE_HOME/ script to initiate the setup wizard. If we want to use ASMFD (ASM Filter Driver), then after we have provisioned the disk/partition at OS level, we can configure ASMFD as follows. We no longer need ASMLib to setup ASM disks once we start using ASMFD.

Thursday, May 18, 2017

Disabling Transparent Huge Pages on Linux 6 and Linux 7

Oracle recommends that Transparent Huge Pages should be disabled before installation of Oracle software. In the following I will explain how to disable Transparent Huge Pages on Linux 6 and Linux 7. I am using Oracle Enterprise Linux where I see that this feature is already disabled. You can check for your release of Linux whether it is disabled or not, and disable it using method explained here. This is the official document for doing this task.

Sunday, May 14, 2017

Fatal NI connect error 12537

If Fatal NI connect error 12537 appears in the alert logfile, following is how it would appear. There is another similar Fatal NI connect error 12547 discussed here.
Fatal NI connect error 12537, connecting to:

            TNS for Linux: Version - Production

Tuesday, May 9, 2017

Error 1017 received logging on to the standby - Along with ORA-16191

Most probable reason for this error appearing in the alert log file of standby database is that primary database is not able to connect to the standby database to ship redo log data because the password for the SYS user in the standby database is not in sync with the primary database. Standby database is also not able to fetch the archive gap because of same discrepancy. Full error stack in the alert log file would look similar to the following.

Friday, May 5, 2017

File #... added to control file as UNNAMED000 and ORA-15041

On your standby database if you see a datafile with the name similar to ‘UNNAMED000’, it means that you have STANDBY_FILE_MANAGEMENT parameter set to auto and managed recovery process tried to create a new datafile (after you already added this file on primary database), but it could not create file because of some reason. I faced this error because my ASM diskgroup was full. Following were the entries in my alert log file of my standby database after adding a datafile in my primary database using command ‘ALTER TABLESPACE my_tablespace ADD DATAFILE ‘+DATA/datafile06.dbf’ SIZE 20g’

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