Oracle column level compression

In traditional relational theory, the internal representation of the data on the physical blocks is not supposed to matter, but in the real world, the placement of the data on blocks is critical.  Oracle provides tools like sorted hash clusters to group related rows together and row-sequencing can dramatically improve the performance of SQL queries by placing all information on a single data block.

Related tables can be grouped together on the same data block using Oracle cluster tables.  For example, this can be done if you have a busy OLTP database where millions of people query customer and related order rows all day long.

If you use Oracle cluster tables to put the customer and order rows together on a single data block, it will greatly reduce the number of trips to the database to fetch the desired result set.

There is a tradeoff in using Oracle 11g table compression between run-time performance of the SQL vs. the processing overhead of compressing and de-compressing the rows.  This type of compression requires overhead, and the less volatile the table, the better the overall performance. 

See below for the advantages and obsticles in using Oracle 11g table compression:

http://dba-oracle.com/t_11g_r2_column_level_compression.htm  

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Need a Health Check?

Oracle is the world's most complex and robust database and there are hundreds of sub-optimal setting that can cripple your database performance.

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There's Always Room at the Top

Burleson Consulting continues to grow as the Oracle community recognizes that high quality Oracle support and training is a cost effective option in these tough economic times.

If you have distinguished yourself in your Oracle career and are ready to step up and enjoy the rewards of joining the ranks of America's top tier support consultants we would like to hear from you.

Evidence of high achievement as an Oracle professional might include publication of books and articles for the Oracle community, achieving an advanced degree from a competitive university and seeking out hands-on experience with complex databases. See here for details and a full qualifications list:

http://www.dba-oracle.com/jobs.htm