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Flashback Database After Dataguard Failover ( STANDBY_BECAME_PRIMARY_SCN)
Flashing Back a Failed Primary Database into a Physical Standby Database The following steps assume the user has already performed a failover involving a physical standby database and Flashback...
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Fix Corrupted Veritas Filesystem VXFS
A Vertitas filesystem can sometimes become corrupted. This specially happens when your replicating a filesystem. So how do you fix that !? Well lets begin. Say your importing a diskgroup called app-dg...
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Flashback in SQL Server 2008
SQL Server and DB2 still dont have features like Flashback Table or Flashback Query. SQL Server has snapshots mimicking similar behaviour of Flashback bit it isn’t as fine grained as Oracle. IBM DB2...
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Oracle Locking Mechanism
Oracle Locking Mechanism Probably the best article out their explaining Oracle’s locking mechanism. Oracle Guru Arup Nanda explains the mystical Oracle DB locking mechanism in a detailed and clear...
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ORA-27054: NFS file system where the file is created or resides is not...
This error normally occurs when you are trying to import a dump file which is residing on an NFS file system or you are copying a file from NFS filesystem onto ASM. The way to resolve the problem is to...
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Copy File from Filesystem to ASM
In this exercise we will copy a file residing on a filesystem onto ASM disk. SQL> create or replace directory asm_dir as '+FRA/BACKUP'; Directory created. SQL> grant read, write on directory...
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12c Oracle Database is now available for download !
There you go http://www.oracle.com/technetwork/database/enterprise-edition/downloads/index.html
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Oracle 12c Database Installation on Linux
Just finished installing Oracle 12c on Cent OS 6.3. From the looks of it 12c looks like a winner. Oracle has changed the architecture of its traditional RDBMS completely. Databases now run as...
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Rapid Web Deployment Tool
I normally post to this blog things relevant to Databases in general and Oracle in particular but once in a while it is good to go a little off topic. In addition to Oracle Apex, which most of Oracle...
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Facebook shares some secrets on making MySQL scale
Reblogged from GigaOM: When you're storing every transaction for 800 million users and handling more than 60 million queries per second, your database environment had better be something special. Many...
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ORA-01476: divisor is equal to zero
This error occurs when an expression is divided by zero. It is considered a logical error in Oracle. In mathematics, division by zero is division where the divisor (denominator) is zero. Such a...
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“Can you have a truly scalable database without going NoSQL?” Google says yes.
http://www.theregister.co.uk/2013/08/30/google_f1_deepdive/
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Search every field of every table for a particular value in oracle
In case you want to search a string or any other number in all tables inside a schema. Then there is a free tool available for it. I have tried many scripts and PL/SQL procedures to do this, but by far...
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Installing Oracle Golden Gate 12c (12.1.2) along side Oracle Database 12c...
Reblogged from DBASolved: With the announcement of Oracle Golden Gate 12c, there comes a few new features that everyone is going to explore. One new feature is the new way of installing Oracle Golden...
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Oracle 11g Release 2 -11.2.0.4 patchset now available.
Oracle has released the much anticipated patchset release to Oracle 11gR2 database. The patch is available on My Oracle Support search for patchset 13390677 or follow the link to reach the download...
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Count number of sessions oracle
– Count number of sessions oracle for 7 days, Provided you keep data that long – select to_char(BEGIN_INTERVAL_TIME,'HH24'), ROUND(SUM(CURRENT_UTILIZATION)/COUNT(*)) FROM DBA_HIST_RESOURCE_LIMIT l,...
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Parameter to prevent license violation with Active Data Guard
Reblogged from The Oracle Instructor: Although Real-Time Query is a great feature, it requires the Active Data Guard option to be licensed AND it is very easy to turn it on. That has been a concern...
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AlwaysOn versus Active Data Guard—A Value Proposition
Reblogged from The SQL Herald: With the launch of SQL 2012, much of my focus has been on the new Availability Groups functionality. I do lots of work in the HA and DR space, and the ability to utilize...
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Storage Myths: Dedupe for Databases
Reblogged from flashdba: Storage for DBAs: Data deduplication - or "dedupe" - is a technology which falls under the umbrella of compression, i.e. reducing the amount of capacity required to store...
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Oracle RAC on VPLEX now certified
Reblogged from Dirty Cache: Last week EMC announced that Oracle RAC on VPLEX stretched clusters is now officially supported and certified by Oracle! News Summary: Oracle has certified that EMC®...
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