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Author: Admin

send email from unix mailx with attachment.

Posted on 07-May-2008 By Admin No Comments on send email from unix mailx with attachment.

mailx -s “test message” pmehta@1800flowers.com

Linux/Unix, shell

Explain Plan Doesn’T Change For Sql After New Statistics Generated

Posted on 06-May-2008 By Admin No Comments on Explain Plan Doesn’T Change For Sql After New Statistics Generated

If you use dbms_stats in 10g it will not automatically invalidate dependant cursors. This is the default behaviour as of 10. To revert to older previous behaviour you will have to set the parameter no_invalidate to false. . no_invalidate Does not invalidate the dependent cursors if set to TRUE. The procedure invalidates the dependent cursors…

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Oracle, SQL scripts

alter database backup controlfile to trace

Posted on 23-Apr-2008 By Admin No Comments on alter database backup controlfile to trace

Backing it up in a human readable format: alter database backup controlfile to trace; alter database backup controlfile to trace as ‘/some/arbitrary/path’; alter database backup controlfile to trace as ‘/some/arbitrary/path’ reuse; If you are using “alter database backup controlfile to trace as ‘test1.sql’; then test1.sql will be created in $ORACLE_HOME/dbs folder.

Oracle, SQL scripts

Insert cause enqueue locks

Posted on 23-Apr-2008 By Admin No Comments on Insert cause enqueue locks

Here is a much simpler version: ——————————- Create table t1 (c1 number primary); session1: insert into t1 values (1); session2: insert into t1 values (1); — would hang v$lock would reveal session 1 blocking session2 on TX lock why? because you have a constraint where you are asking Oracle to check uniqueness of data (unique…

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Oracle, SQL scripts

Reclaim temp tablespace for oracle 8, 8i

Posted on 14-Apr-2008 By Admin No Comments on Reclaim temp tablespace for oracle 8, 8i

Case 1:- Allocate More space to temp tablespace before starting the analyze. U can reclaim space by doing. Alter tablespace temp offline; Alter tablespace temp online; Alter tablespace temp coaelsce; Case 2:- If there is some spcace then allocate around 10 GB of space to TEMP .

Oracle, SQL scripts

changing kernel parameter in Oracle Enterpise Linux

Posted on 11-Apr-2008 By Admin No Comments on changing kernel parameter in Oracle Enterpise Linux

change the file /etc/sysctl.conf for the kernel parameters. DBA generally do this for changing semaphore and shared memory parameters. Run the following command to change the current kernel parameters. $ /sbin/sysctl -p

Linux/Unix, shell

Temporary tablespace explaination

Posted on 10-Apr-2008 By Admin No Comments on Temporary tablespace explaination

A new mechanism to control the allocation of temporary storage space was introduced in 7.3, initially as support for OPS, but it is equally applicable to non-OPS environments. This requires the creation of a designated temporary tablespace, that is one created with the designation TEMPORARY. The effect of this is twofold: 1. No permanent objects…

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Oracle, SQL scripts

restarting network in linux

Posted on 09-Apr-2008 By Admin No Comments on restarting network in linux

Restart networking: # /etc/init.d/network restart

Linux/Unix, shell

How to change hostname in Linux

Posted on 09-Apr-2008 By Admin No Comments on How to change hostname in Linux

=> Edit file /etc/sysconfig/network using your favourite editor. => Look for HOSTNAME=xxxxxx => Change the xxxx to the name you wish to set for your computer. (ex: HOSTNAME=techiecorner.com) => Save the file and restart the server.

Linux/Unix, shell

good linux notes

Posted on 09-Apr-2008 By Admin No Comments on good linux notes

http://tldp.org/HOWTO/Partition/intro.html

Linux/Unix, shell

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