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Oracle DBCA templates for database creation

Oracle Database Tips by Donald Burleson

The database creation assistant (DBCA) is an assistant that is designed for beginners who do not understand the details for instance optimization.  The DBCA templates are only starting points and you will adjust your instance based on your specific processing needs.

For details on optimizing your initialization parameters for specific "types" of Oracle instances, see my masterwork book "Oracle Tuning: The Definitive Reference".  You can save 30% by getting it directly from the publisher and you also get instance access to the code depot of diagnostic scripts.

There are three templates, general purpose, OLTP and data warehouse, and the parameter setting are the most important differences in these DBCA templates.  Let's compare the settings, and see how these parameter values are only starting points, and sub-optimal because they have not been adjusted for your specific workload:

Name Data Warehouse OLTP General
db_block_size 8192 4096 8192
db_cache_size 16m 33m 25m
db_file_multiblock_read_count 32 8 16
hash_area_size 1m n/a n/a
hash_join_enabled TRUE FALSE TRUE
pga_aggregate_target 33m 16m 25m
query_rewrite_enabled TRUE FALSE FALSE
shared_pool_size 50m 50m 48m
sort_area_size 1,000k 500k 500k
star_transformation_enabled TRUE FALSE FALSE
undo_retention 10,800 900 10,800

As we see, the DBCA only provides general starting point parameter settings, and these parameter values are guaranteed to be sub-optimal.  To be through, as soon as you are ready to go into production, you need to conduct a full Oracle health check and re-set the parameters to suit your specific processing needs.

If you like Oracle tuning, see the book "Oracle Tuning: The Definitive Reference", with 950 pages of tuning tips and scripts. 

You can buy it direct from the publisher for 30%-off and get instant access to the code depot of Oracle tuning scripts.



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