The process for modifying a votedisk that is stored on ASM differs from the process when the votedisk is stored on some other medium. When your voting disks are stored on ASM you can move them off to non ASM storage with the replace command: $ crsctl replace votedisk [path_to_new_votedisk] (this can be done from …
An ASM instance forms and presents is the underlying structure for an ASM dynamic volume. ASM provides a disk group which is really a logical container for physical space. ASM is very efficient at storing data files but there are many types of files that cannot be stored on ASM and it cannot be read …
An ASM instance has its own SGA but it is not the same as the SGA in a database instance. The 4 main sections of the SGA in an ASM instance are: ASM Cache – this is used during rebalancing operations for reding and writing blocks. Large Pool – Used for Parallel Operations. Shared Pool …
You cannot simply add more copies of voting disks to increase redundancy because the number of voting disks is managed by Oracle ASM and determined by the redundancy of the disk group. To increase the number of voting disks, you need to move them to a disk group with higher redundancy. So, create the new …
Oracle CRS backs up the OCR automatically at regular intervals. The standard backup frequency and retention policies are Every 4 hours – keeping the last 3 copies. Every day (at the end) – keeping the last 2 copies. Every week (at the end) – keeping the last 2 copies. You can find the location …
SQL performance analyzer performs a similar job to the SQL Tuning Advisor with one major difference, SQL performance analyser allows you to compare the performance of SQL statements before and after a change, allowing you to predict the impact of changes to the system on SQL performance as well as pre tuning your database before …
The automated tuning process in Oracle 11g is implemented by a number of functions in the Oracle database: Automatic Database Diagnostic Monitor (ADDM) Takes input from the AWR reports which it analyses in order to identify potential bottlenecks. If the statistics level parameter is set to TYPICAL or ALL then the ADDM is ran …
To make administration and problem diagnosis easier in Oracle Clusterware, there is a single consolidated directory structure for the main clusterware log files. This is found under $GRID_HOME/log/[hostname]/ The CRSD logfile – crsd.log is stored in the /crsd/ directory and is archived every 10mb. The CSS logfiles – cssd.log is stored in …
In order to enable clusterware resource debugging you need to set the resource attribute USR_ORA_DEBUG to 1 for the resource that you wish to debug. $ crsctl set log res “ora.host01.vip:1” When you are finished you issue almost the same command to disable the clusterware debugging (set USR_ORA_DEBUG to 0): $ crsctl set log res “ora.host01.vip:0” You can also use an initialization …
How to Check the integrity of Oracle Cluster Configuration (OCR) files To check the health ot OcR files, ther are 3 methods that can be used in unison. Check for voting disk issues in the ocssd.log with: grep $GRID_HOME/log/[hostname]/ocssd.log There are also 2 commands that can help. They are ocrcheck and cluvfy You run ocrcheck …