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 …
SQL plan baselines are a new feature introduced in Version 11g. SQL execution plans determine how a query is executed and the path that is taken to retrieve the data. Plans can be evolved or improved over executions and should only change when a better plan can be found. When a query is hard parsed, …
Tablespace encryption is a feature introduced to increase security of your database. The idea is that by encrypting your tablespaces, you will stop anyone who gets a copy of your datafiles outside of your database from being able to access the data on them. For example someone may be able to get copies of your …
Virtualbox is Oracle’s solution to visualization and as such it is very powerful. It is similar to VMware as it has much the same capabilities and you can run servers through it on an enterprise level. For the purposes of experimenting with operating systems and learning Oracle, it gives us some amazing benefits and makes …
Unfortunately, the installer or more specifically the root.sh script for the Oracle 11g grid (Clusterware) installer can be very flaky. If it fails and you need to fix something or rerun it for any reason, it will fail the next time if you have not cleaned up the install by de-configuring CRS. I also …
Firstly, you need to create files padded to the required disk size. So if you want 4 1Gb files you could execute the below commands on shared storage: dd if=/dev/zero of=/SHAREDDISK/asmDisk1-1 bs=1024k count=1000 dd if=/dev/zero of=/SHAREDDISK/asmDisk1-2 bs=1024k count=1000 dd if=/dev/zero of=/SHAREDDISK/asmDisk1-3 bs=1024k count=1000 dd if=/dev/zero of=/SHAREDDISK/asmDisk1-4 bs=1024k count=1000 dd creates your file, ‘if’=/dev/zero gets null …
This is a problem with the config of the NTP daemon (ntpd) which synchronizes time across the cluster. The specific error is to do with the boot time behavior of the daemon and needing the ‘Slewing’ option enabled. If you need to enable slewing, you can do it by typing ‘ntpd -x’, however, the grid …
Features embedded in Oracle Kernel Improves performance and manageability for NFS drives Configuring: NFS file system should be mounted and available. Direct NFS does not mount drives Direct NFS client uses either: configuration file called ‘oranfstab’ mount file tab – /etc/mtab First: $ ORACLE_HOME/ dbs/oranfstab which would specify the Direct NFS Client settings for a single database. Then /etc/oranfstab …
A brief discussion on Oracle ASM and some of its advantages over other file systems. Notes: Database centric file system only used for managing database files High performance Requires a certain amount of tuning Not suitable for all applications Current recommendation is to allow ASM handle raid mirroring rather than let hardware handle it Probably …
Oracle Indexes The degree to which indexes help performance depends partly on the selectivity of the data.High selectivity – Few rows match the index valueLow selectivity – like Country name returns many rows from the index If data is selective but the rows are not stored near each other in the table, many blocks may …