This post provides an example on how to modify an existing Automatic Storage Management (ASM) spfile in a two-node Real Application Clusters (RAC) Environment. These steps can be applied to a multiple node Real Application Clusters (RAC) Environment. Applies To: Oracle Database - Enterprise Edition - Version 10.2.0.1 to 11.1.0.7 [Release 10.2 to 11.1] If a spfile is used in Clustered ASM environments, then the spfile must be on a shared Clusterware device, i.e. shared spfile. Note: … [Read more...] about How to Modify an Existing ASM Spfile in a RAC Environment
Oracle 10g
How to list all the named events set for a database
Oracle Internal Events, both named event (eg: ERRORSTACK) as numeric events (eg 10046) can be set at the session level. This post outlines how DataBase Administrators can verify which events have been set in a specific session or in the entire system. This can be achieved through the ORADEBUG functionality. The exact syntax to use depends on the Oracle version you are using. If you want to retrieve the events set in a specific session, then use the following oradebug commands to identify the … [Read more...] about How to list all the named events set for a database
Step By Step Guide To Create Physical Standby On Normal File System For ASM Primary using RMAN
This post covers the detailed steps for creating a physical standby database on a normal file system using RMAN for a primary database in ASM. Overview Here the Standby database can be created using the following 2 methods: Normal Restore and Recovery using RMAN. Creating a Duplicate database for Standby using RMAN. Method 1 Perform the backup of the ASM primary database ( Datafiles, Controlfile for standby and Archivelogs ) Make the backup pieces available on the Standby … [Read more...] about Step By Step Guide To Create Physical Standby On Normal File System For ASM Primary using RMAN
How to Create a Physical Standby from ASM Primary
The Setup This post offers step by step procedure to create physical standby from ASM primary. Database Name: chicago Primary db_unique_name: chicago standby db_unique_name: boston Primary Hostname: prim.example.com standby Hostname: stdby.example.com Steps 1. Enable Force Logging: SQL> ALTER DATABASE FORCE LOGGING; Database altered. 2. On the primary node, create a staging directory. For example: [oracle@prim ~]$ mkdir –p /home/oracle/stage 3. Create the same exact … [Read more...] about How to Create a Physical Standby from ASM Primary
How To Catalog Backups / Archivelogs / Datafile Copies / Controlfile Copies in Oracle Database
The RMAN CATALOG command is used to accomplish the following: Add backup pieces and image copies on disk to the RMAN repository. Record a datafile copy as a level 0 incremental backup in the RMAN repository, which enables you to use it as part of an incremental backup strategy. Record the existence of the last user-managed datafile copies made after the final shutdown. Restrictions and Usage Notes You must be connected to the target database, which must be mounted or open. If RMAN … [Read more...] about How To Catalog Backups / Archivelogs / Datafile Copies / Controlfile Copies in Oracle Database
RMAN: SET NEWNAME Command Using SQL
When you must restore the database the same directory structure is not always available. If you have a database containing 1000s of datafiles it can be very tedious to setup the set newname commands for all the datafiles. Using sqlplus we can extract the information we need into a file which can then be easily modified and executed as an RMAN script to complete the task. Oracle 11g New Command - 'SET NEWNAME FOR DATABASE' Starting from 11.2, we can use SET NEWNAME FOR DATABASE clause to … [Read more...] about RMAN: SET NEWNAME Command Using SQL
Script to monitor RMAN Backup and Restore Operations
RMAN is designed to complete a backup or restore as quikly and efficiently as possible. But if a job takes longer than expected to complete it can be confusing trying to determine: What precisely is RMAN doing at any particular time? Is RMAN hung or just slow? How far into the backup/restore has it got? How much more work is there to go? Knowing just how much processing has been done so far is often crucial when trying to decide whether or not to wait for job completion. RMAN … [Read more...] about Script to monitor RMAN Backup and Restore Operations
Oracle RMAN Backup Shell Script Example
Pre-requisites 1. Create a catalog database (rmancat) if one does not exist. (With additional UNDO-, USERS- and TEMP-tablespaces) 2. Configure SQL*Net to handle the catalog (rmancat) and the 'target' database connections. 3. Create a user 'RMAN' in the catalog database. SQL> create user rman identified by rman default tablespace USERS quota unlimited on users temporary tablespace TEMP; SQL> grant recovery_catalog_owner to rman; 4. Create the RMAN-catalog in the … [Read more...] about Oracle RMAN Backup Shell Script Example
Beginners Guide to RMAN compression for backups
As the databases keep growing, so does the space occupied by their backups. Fortunately, RMAN has built-in support to compress such large-sized backups which can be handy rather than using an OS utility such as TAR or so on. The following are the 3 kinds of compression techniques used by RMAN: Null compression Unused block compression Binary compression RMAN uses block compression by default and that's why you can't set it off (or on either). Two modes of block compression are … [Read more...] about Beginners Guide to RMAN compression for backups
Difference between using srvctl vs using sqlplus for start/stop one or more Oracle Database Instances
The Problem We have had some instances where it seemed that starting rac databases through sqlplus caused performance issues (high load on database server ). Restarting the nodes using srvctl seemed to resolve the performance issue. "Is there any difference between using srvctl vs using sqlplus for starting or stopping one or more database nodes."? The Solution The Differences between SQLPLUS and SRVCTL There are some differences between the use of SQLPLUS and SRVCTL utilities. - Both … [Read more...] about Difference between using srvctl vs using sqlplus for start/stop one or more Oracle Database Instances