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Oracle10g Grid Computing with RAC
Chapter 12 - RAC Design Considerations

Using Locally Managed Tablespaces

For example, tables with relatively high insert rates can be placed in a tablespace with a 10MB uniform extent size. On the other hand, small tables with limited DML activity can be placed in a tablespace with a 100K uniform extent size. For an existing system, where tablespaces are not organized by segment size, this type of configuration can require significant reorganization efforts with limited benefits. For that reason, compromise by making most of the tablespaces locally managed, with AUTOALLOCATE instead of UNIFORM extent allocation.

Minimizing Table Locks to Optimize Performance

For RAC, table locks are coordinated through global inter-instance communication. Due to the fact that properly designed applications do not need to lock entire tables, table locks can be disabled to improve locking efficiency with minimal adverse side effects. Essentially, there are two methods for disabling table locks:

  • Disabling table locks for individual tables.

  • Setting dml_locksto zero.

Let's examine these methods.

Disabling Table Locks for Individual Tables

To prevent users from acquiring individual table locks, use the following statement:


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