||Oracle Tips by Burleson
Oracle10g Grid Computing
Chapter 12 - RAC Design Considerations
Using Locally Managed Tablespaces
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
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:
examine these methods.
Disabling Table Locks for Individual Tables
users from acquiring individual table locks, use the following
table_name DISABLE TABLE LOCK
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