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RDBMS Server

Oracle RDBMS Server Articles

Using hash clusters to solve buffer busy wait problems

Concurrent inserts into a table will often result in crippling buffer busy wait problems as sessions serialize on access to the last block(s) of the table segment. Using hash clusters can remove the issue.

Database 12c deferred global index maintenance

Many people are terrified of global indexes, one reason being that partition DDLs on the table will either render them unusable, or take forever as they are updated. Deferred global index maintenance solves this, and should be an important driver for the 12c upgrade.

The COMMIT_WRITE parameter

Can this parameter really boost performance? This simple test suggests that it can.

Oracle 12c new feature: Unified Audit

Unified Audit is a major architectural change: fast, easy, and impossible for the DBA to bypass. On upgrade to Oracle 12c, you really should enable it. The earlier method that we all use is pretty awful.

12c SQL tuning: adaptive execution plans

The concept of an adaptive plan is that execution of a statement can start with one plan, and (during execution) switch to another. A pretty amazing capability. No need to run the statement to completion and try again: correct it in flight.

Database 12c: automatic generation of extended statistics

Why does the CBO get it wrong? Often because it has insufficient information. No matter how often you analyze your tables, if your queries use multi-column predicates, the CBO will mis-calculate the cardinalities. You have to understand your data, and create extended statistics to correlate the columns. How many people do this? Hardly any. Not a problem any more: release 12c can do this for you. If you configure it appropriately.

Grid Infrastructure and RAC: the cluster interconnect

A necessary part of a cluster is the cluster interconnect: the private network between the cluster nodes. This component is critical for both reliability and scalability, and configuring it for fault tolerance and capacity is a matter of burning importance for the DBA and his System Administrator (not to mention the end users). One question is, should this be managed by the operating system or by Oracle?

DB12C installation

http://myoracleproduct.blogspot.in/2013/11/installation-of-oracle-12c-database.html

Please find the installation steps for ORACLE 12C Database.

Blog consists of step by step procedure to install the 12C DB. Screenshots helps you to select the options easily through out the installation.

Get the hands on experience with installation and working with 12C database.

12c Scheduler new feature: external_script jobs

In earlier releases, running a shell script from the Scheduler was awkward. Oracle has realized this, and introduced a new job type in 12c that makes it simple.

Three impossibilities with partitioned indexes

There are three restrictions on indexing and partitioning: a unique index cannot be local non-prefixed; a global non-prefixed index is not possible; a bitmap index cannot be global. Why these limitations? I suspect that they are there to prevent us from doing something idiotic.