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constantly writing to disk. Furthermore, if the log buffer is too small, it will frequently run out of space to accommodate new redo entries. Oracle provides an option called nologging that lets you bypass the redo logs almost completely and thus avoid contention during certain operations (such as a large data load). You can also batch the commits in a long job, thus enabling the log writer process to more efficiently write the redo log entries.
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The Large Pool and the Java Pool
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The large pool is a purely optional memory pool, and Oracle manages it quite differently from the shared pool. You only need to configure the large pool if you re using parallel queries in your database. Oracle also recommends configuring this pool if you re using RMAN or the shared server configuration instead of the default dedicated server configuration. You set the size of this pool in the initialization file by using the LARGE_POOL_SIZE parameter. The large pool memory component is important if you re using the shared server architecture. The Java pool (set by using the JAVA_POOL_SIZE parameter) is designed for databases that contain a lot of Java code, so that the regular SGA doesn t have to be allocated to components using Java-based objects. Java pool memory is reserved for the Java Virtual Machine (JVM) and for your Java-based applications. If you re deploying Enterprise JavaBeans or using CORBA, you could potentially need a Java pool size greater than 1GB.
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Oracle Streams is a technology for enabling data sharing among different databases and among different application environments. The Streams pool is the memory allocated to support Streams activity in your instance. If you manually set the Streams pool component by using the STREAMS_POOL_ SIZE initialization parameter, memory for this pool is transferred from the buffer cache after the first use of Streams. If you use automatic shared memory management (discussed next), the memory for the Streams pool comes from the global SGA pool. The amount transferred is up to 10 percent of the shared pool size.
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The Program Global Area
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Oracle creates a program global area for each user when the user starts a session. This area holds data and control information for the dedicated server process that Oracle creates for each individual user. Unlike the SGA, the PGA is for the exclusive use of each server process and can t be shared by multiple processes. A session s logon information and persistent information, such as bind variable information and data type conversions, are still a part of the SGA, unless you re using a shared server configuration, but the runtime area used while SQL statements are executing is located in the PGA. For example, a user s process may have some cursors (which are handles to memory areas where you store the values for variables) associated with it. Because these are the user s cursors, they are not automatically shared with other users and so the PGA is a good place to save those private values. Another major use of the PGA is for performing memory-intensive SQL operations that involve sorting, such as queries involving ORDER BY and GROUP BY clauses. These sort operations need a working area, and the PGA provides that memory area.
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For most OLTP databases, where transactions are very short, the PGA use is quite low. On the other hand, complex, long-running queries, which are more typical of DSS environments, require larger amounts of PGA memory.
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CHAPTER 5 ORAC LE DATABA SE 1 1G AR CHITECTURE
You can classify the PGA memory into the following types: Private SQL area: This area of memory holds SQL variable bind information and runtime memory structures. Each session that executes a SQL statement will have its own private SQL area. Runtime area: The runtime area is created for a user session when the session issues a SELECT, INSERT, UPDATE, or DELETE statement. After an INSERT, DELETE, or UPDATE statement is run, or after the output of a SELECT statement is fetched, the runtime area is freed by Oracle. If a user s session uses complex joins or heavy sorting (grouping and ordering) operations, the session uses the runtime area to perform all those memory-intensive operations.
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