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Note: All the posts are based on practical approach avoiding lengthy theory. All have been tested on some development servers. Please don’t test any post on production servers until you are sure.

Sunday, February 26, 2012

Case Sensitive Passwords in 11g

Case sensitive passwords (and auditing) are a default feature of newly created Oracle 11g databases. The Database Configuration Assistant (DBCA) allows you to revert these settings back to the pre-11g functionality during database creation.

Wednesday, February 22, 2012

Disable Oracle's password expiry (11g)

 Unlike older releases, Oracle 11g sets password expiry by default. That's really annoying

  • for SYS and SYSTEM: nobody wants to regularly change (and forget) them.

Tuesday, February 21, 2012

Slow TNSPING time

TNSping's only function is to send a Connect Packet (NSPTCN) to the listener; the listener replies with a Refuse Packet (NSPTRF) and a round trip time is computed. TNSping should never be used to test network performance.

Monday, February 20, 2012

ORA-01017 May Cause ORA-3136 WARNING : Inbound Connection Timed Out in Alert Log

How to reproduce the error ORA-3136 WARNING : inbound connection timed out ?
This is the most common reason when you notice the warning message in the alert log.

Monday, February 06, 2012

DG4MSQL Installation/Configuration - 11g RAC

Oracle Database Gateways provide the ability to transparently access data residing in a non-Oracle system from an Oracle environment. This transparency eliminates the need for application developers to customize their applications to access data from different non-Oracle systems, thus decreasing development efforts and increasing the mobility of the application.

Sunday, February 05, 2012

Installing 11g RAC on Windows 2008

Overview of new concepts in 11gR2 Grid Infrastructure
The single client access name (SCAN) is the address used by all clients connecting to the cluster. The SCAN
name is a domain name registered to three IP addresses, either in the domain name service (DNS) or the Grid
Naming Service (GNS). The SCAN name eliminates the need to change clients when nodes are added to or

Create the database - RAC 11g

Run ASMCA to create diskgroups
Prior to creating a database on the cluster, the ASM diskgroups that will house the database must be created.
In an earlier chapter, the ASM disks for the database diskgroups were stamped for ASM usage. We will now

RDBMS Software Install -RAC 11g

Prior to installing the Database Software (RDBMS) it is highly recommended to run the cluster verification
utility (CLUVFY) to verify that Grid Infrastructure has been properly installed and the cluster nodes have

Oracle Grid Infrastructure Install

Basic Grid Infrastructure Install (without GNS and IPMI)
  • Shutdown all Oracle Processes running on all nodes (not necessary if performing the install on new servers)

Prepare the shared storage for Oracle RAC

This post describes how to prepare the shared storage for Oracle RAC
1. Shared Disk Layout
2. Enable Automounting of disks on Windows
3. Clean the Shared Disks
4. Create Logical partitions inside Extended partitions
5. Drive Letters

Prepare the cluster nodes for Oracle RAC

Before installation of RAC 11g R2 , you have to prepare the cluster nodes. Following must be performed.
User Accounts
The installation should be performed as the Local Administrator, the Local Administrator username and


Single Client Access Name (SCAN) is s a new Oracle Real Application Clusters (RAC) 11g Release 2 feature that provides a single name for clients to access Oracle Databases running in a cluster. The benefit is that the client’s connect information does not need to change if you add or remove nodes in the cluster.