Writing About Our Experiences With Oracle Databases
Sunday February 5th 2012

Latest Topics

11gR2:Listener Startup Issues

In this blog post I will be discussing listener startup issues faced in 11gR2 RAC. I will be constantly updating this [Read More]

Get Upgrading: Upgrade to Enterprise Manager Cloud Control 12c

Get Upgrading: Upgrade to Enterprise Manager Cloud Control 12c

This post describes the steps to upgrade an existing 11g Enterprise Manager Grid Control (11.1.0.1.0) to 12c [Read More]

Cluster SSH tool Utility

Cluster SSH tool Utility

Many times you come across scenario’s when you wish to open multiple ssh windows and execute same commands.e.g [Read More]

11g: Multiple failed login attempt can block New Application connections

In Oracle database 11g, a new feature/enhancement has potential of bringing down the application due to multiple [Read More]

Optimizer Choosing Nested-Loop Joins Instead of Hash-Joins

In one of my databases, one application query suddenly started to pick Nested-Loop joins instead of Hash-Joins and took [Read More]

Posts Tagged ‘database’

11g: Multiple failed login attempt can block New Application connections

In Oracle database 11g, a new feature/enhancement has potential of bringing down the application due to multiple sessions hitting database with wrong password. As per Bug 7715339 – Logon failures causes “row cache lock” waits – Allow disable of logon [Read More]

Changing CRS/Database timezone in 11.2.0.2 post install

I had installed a 11.2.0.2 RAC setup few days back with incorrect timezone. It had to be PDT but I installed with UTC. Starting/stopping clusteware with correct timezone didn’t solve the issue. In 11.2.0.2 Oracle stores timezone information in file [Read More]

Oracle Database Appliance Introduced

Oracle has introduced it new product: ODA (Oracle Database Appliance) I was not able to join Oracle President Mark Hurd’s webcast where he supposed to announce a new Oracle product, now viewing this webcast HERE Kerry Osborne has shared information about this product, [Read More]

Effect Of Multiple SHMMAX Settings

Last week I saw a warning message at database startup time saying: WARNING: EINVAL creating segment of size 0x000000000f0020xx fix shm parameters in /etc/system or equivalent It is an Oracle 10204 database running on Solaris. Searching MOS for exact meaning for this [Read More]

Using Oracle Wallet to Execute Shell script/cron without hard coded Oracle database password

Using Oracle Wallet to Execute Shell script/cron without hard coded Oracle database password

You have been asked to schedule a shell script which need to connect to a  particular user and perform some action? How do you pass the password to script without hardcoding it in script. If password is written in a script, isn’t it a security threat? Well with 10gR2 [Read More]

Oracle 11gR2 on linux is out

Oracle 11gR2 has been released for linux x86 and x86-64 platform. Software can be downloaded at http://www.oracle.com/technology/software/products/database/index.html Guys start downloading..:) .. Note: – As of now documentation link  is not available on [Read More]

CleanUp Temporary Segments Occupying Permanent Tablespace

There are situations when we see “temporary segments” in permanent tablespaces hanging around and not getting cleaned up. These temporary segments in permanent tablespace can be created by DDL operations like CTAS and “alter index..rebuild” because [Read More]

Generating Datapump Export Dump with Dumpfile name Containing Current Date and Time

Few days back I got a request from development team to generate hourly export dumps of few schemas. Following were the requirements: 1. Dumpfile name should contain current date and timestamp information. 2. The generated dumpfile should be moved to a specific location. 3. [Read More]

Cloning database..Just do some Post checks !!

Well I will be covering some points which I believe should be part of post checklist for any cloned database environment. This might not be complete list as it contains point which I have encountered or heard of. 1) Change database Name and Database Id You should try to [Read More]

Connections to DataBase Hang Including “/ as sysdba”

Recently I faced one issue where all the connection to database hung and it was also not possible to login to database using “/ as sysdba”. To get access of sqlplus I used the following syntax: $ sqlplus -prelim / as sysdba With “prelim” option we [Read More]

Scheduling Job through Cron??

In case you came across this link searching for Cron syntax, then you can refer to following link http://www.adminschoice.com/docs/crontab.htm Other’s can continue reading the article …. This was a problem which I faced yesterday. We had a mview refresh which [Read More]

Recreating Database Link

I was trying to recreate database links as part of database migration activity. This involved mixture of 8i,9i and 10g database. In case of 8i/9i it is very easy to find the old password which was used to create database link as passwords for database links are stored in [Read More]

Creating Oracle Extended RAC on Oracle VM

Yesterday, I found one very useful article at OTN “Creating Oracle Extended RAC” on completely virtual environment using Oracle VM. As Virtualization is becoming popular day by day and is very cost effective, one must know how to use this to simulate actual [Read More]

Full Database Export Failing With ORA-00980

While trying to do a full export for 10.2.0.3 database, we were getting following errors About to export the entire database ... . exporting tablespace definitions . exporting profiles . exporting user definitions . exporting roles . exporting resource costs . exporting [Read More]

Checking Database Feature Usage Stats

Today I came across view DBA_FEATURE_USAGE_STATISTICS (10g) which let’s us know whether particular Database Feature has been used till now or not. If yes, then it also let’s us know when it was used for the first time and also the last usage time. This can be [Read More]

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Recent Comments

Saurabh Sood had this to say

Hi Pawan, We cannot force the writes to a specific disk. At least I am not aware of any such thing. Oracle will Read the post

Amit had this to say

hi Pawan, ASM_PREFERRED_READ_FAILURE_GROUPS is mainly used for RAC instances and that too stretch clusters i.e when Read the post

PAWAN had this to say

HI, i am newbie.... please guide me! My manager asked me to configure ASM in 11g with single instance Read the post

PAWAN had this to say

HI, i am newbie.... please guide me! My manager asked me to configure ASM in 11g with single instance Read the post

Saurabh Sood had this to say

@Ganesh: The global stats were up-to-date for both the databases, though I did not check the col stats. But the Read the post