The Parallel Query Option (PQO) is best used for systems where large, intense queries are being performed or where large amounts of data are being loaded, indexed and queried, such as in data warehous...
While you initially configure MTS in your instance parameter file, there are some changes that you can make while the instance is running. Using the ALTER SYSTEM command, you can manually adjust the n...
Just as the architecture of the database buffer cache has changed dramatically from release to release, so too have the effectiveness of the tools Oracle supplies to assist with tuning the database bu...
Because tablespaces are not unchanging objects, monitoring tablespaces is an important aspect of the DBA's monitoring responsibilities. Tablespaces are automatically defragmented by the SMON process....
The redo logs store all transactions which alter the database, all committed updates, adds, deletes of tables, structures or data. If archiving is disabled, only data in the current off-line and on-li...
Like tables and indexes, rollback segments may run out of space during processing and need to request additional extents. Dynamic extension can have a serious impact on performance, particularly on th...
Oracle is an Object-Relational Database Management System, or, ORDBMS for short. A traditional RDBMS (Oracle Version 7 and below) stores data in tables called relations. These relations are two dimens...
This section discusses the following Net8 configurations: Dedicated server Multi-threaded server (MTS) Oracle Internet Directory Oracle Names Connection Manager As you read these sections, bear...
There are several ways to look at what's happening in a multi-threaded server environment. Using operating-system commands, you may be able to see a list of the dispatcher and shared server processes ...
As their name implies, locally managed tablespaces do not manage their free and used extents by the data dictionary but are instead managed at the local tablespace level. This local management is acco...
Shared pool latch contention can occur when the shared pool is sized too large to be effectively managed. Starting with Oracle version 8.1.6, Oracle implemented improved shared pool management archite...
SGA refers to a Shared Global Area. As the term global implies, this area is accessible to all Oracle processes and users. Each instance will have its own SGA. Oracle processes and users must share la...
