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In previous versions of Oracle, DBAs spent quite a bit of time pondering the sizing of the SGA. It wasn t uncommon for them to recalibrate the SGA size quite often as part of their instance-tuning efforts. In Oracle Database 11g, you can configure automatic memory management by using the new MEMORY_TARGET initialization parameter. All you need to do is assign a certain value for the MEMORY_TARGET parameter, and Oracle will automatically manage the distribution of this memory between the SGA and the PGA components. Oracle s allocation of the SGA memory to the various components isn t static, but changes with the changing workload of the database. Oracle can automatically manage the following five components of the SGA (the relevant Oracle initialization parameter is in parentheses): Database buffer cache (DB_CACHE_SIZE) Shared pool (SHARED_POOL_SIZE) Large pool (LARGE_POOL_SIZE) Java pool (JAVA_POOL_SIZE) Streams pool (STREAMS_POOL_SIZE) As you can see, Oracle automatically tunes five components of the SGA, which are referred to as the automatically sized SGA parameters. You must still manage the rest of the SGA components yourself, even under automatic shared memory management. The following are the manually tunable components of the SGA: Keep buffer cache (DB_KEEP_CACHE_SIZE) Recycle buffer cache (DB_RECYCLE_CACHE_SIZE)
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CHAPTER 5 ORAC LE DATABA SE 1 1G AR CHITECTURE
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Any nonstandard block size buffer caches (DB_nK_CACHE_SIZE) Redo log buffer (LOG_BUFFER) Note that the first three components in this list are optional. As the DBA, you must set the value for each of the manual SGA components.
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Memory Management Options and Defaults for Database Installation
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When you create a database with the Database Configuration Assistant (DBCA), if you choose the basic installation option, automatic memory management is enabled by default. If you choose the advanced installation option instead, you ll get to choose from the following three memory management configurations: Automatic memory management Automatic shared memory management + automatic PGA memory management Manual shared memory management + automatic PGA memory management If you create a database with the CREATE DATABASE statement and don t provide any memory management related initialization parameters, manual shared memory management is the default. For the PGA, automatic PGA memory management will be the default configuration.
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If the SGA_TARGET parameter is set to zero (the default), the auto-tuned SGA parameters behave as in previous versions of Oracle.
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You can learn more about automatic memory management configuration in 17.
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So far in this chapter, you ve seen the components of the Oracle database system: the necessary files and memory allocations and how you can adjust them. It s time now to look into how Oracle processes users queries and how it makes changes to data. It s important to understand the mechanics of SQL transaction processing because all interaction with an Oracle database occurs either in the form of SQL queries that read data or SQL (or PL/SQL) operations that modify, insert, or delete data. A transaction is a logical unit of work in an Oracle database, and consists of one or more SQL statements. A transaction begins with the first executable SQL statement and terminates when you commit or roll back the transaction. Committing a transaction will make your changes permanent, and rolling back the changes will, of course, undo them. Once you commit the transaction, all other users transactions that start subsequently will be able to see the changes made by your transactions. When a transaction fails to execute completely (say, due to a power failure), the entire transaction must be undone. Oracle will roll back any changes made by earlier SQL statements in the transaction, leaving the data in its original (pretransaction) state. The whole process is designed to maintain data consistency a transaction is an all-or-nothing concept. The following simple example of a row being inserted outlines how Oracle processes transactions: 1. A user requests a connection to the Oracle server through a 3-tier or an n-tier web-based client using Oracle Net Services. 2. Upon validating the request, the server starts a new dedicated server process for that user.
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