||Oracle Tips by Burleson
Oracle10g Grid Computing
Chapter 12 - RAC Design Considerations
Proper Sequence Usage
applications, the sequence numbers used must be sequential, an example
would be the line numbers for a purchase order, or perhaps check
numbers for an automatic check printer. In this case, a sequence table
may have to be used to store the highest sequence number. The value is
read from the sequence table, increased by one, and then updated.
While all of this occurs, the row for the sequence being used is
locked, thus no one else can use it. If you must use this type of
logic, place the table in a tablespace with a 2048 block size, and set
the pctfree high enough
that only one row per block is allowed. This will reduce the chances
of intra-instance pinging (assuming you have more than one sequence
stored in the table).
Tablespace Design in Real Application Clusters
The goal in
tablespace design is to group database objects according to their data
access distribution patterns. The dependency analysis and transaction
profiles of the database must be considered, then tablespaces are
divided into containers for the following objects:
and randomly modified tables and indexes belonging to particular
and randomly modified tables and indexes with a lower probability of
having affinity to any functional area.
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