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The ideal situation is that all SQL statements should execute optimally, but this goal may be impossible to reach In data warehouse A statement s shared SQL operations, the optimal memory allocation can area is in the shared pool of the SGA; its be many gigabytes if the queries are addressing private SQL area is in the session s PGA vast tables In such environments, one-pass executions may be the best that can be achieved Multipass executions should be avoided if at all possible For example, to sort 10 GB of data may require something over 10 GB of memory to run optimally, but only 40 MB to run with one pass Only if less than 40 MB is available will the sort become multipass, and execution times will then increase substantially Managing PGA memory can be automatic, and Oracle Corporation strongly recommends that it should be The older manual management techniques are supported only for backward compatibility and will not be discussed here To implement automatic PGA memory management, you set a target for the total PGA memory allocation, summed up for all sessions The Oracle instance will then pass out memory from this total to sessions on demand When a session has finished executing its statement, the PGA it was using can be allocated to another session This system relies on the fact that at any one moment only some of the connected sessions will need any negotiable PGA memory They will all need a certain amount of PGA memory to retain the state of the session even when the session is idle, but this will leave enough from the total so that those sessions actually running statements can have what they need At least, that is what one hopes It is sometimes impossible to achieve optimal memory allocations, because the memory requirements can be huge One-pass executions are bad but may be unavoidable Multipass executions are disastrous, and if these are occurring, you should talk to the system administrators about available hardware and to the programmers about tuning their SQL Automatic PGA memory management is enabled with two instance parameters:
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WORKAREA_SIZE_POLICY PGA_AGGREGATE_TARGET
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The WORKAREA_SIZE_POLICY will default to AUTO, meaning that Oracle can assign PGA to sessions on demand, while attempting to keep the total allocated PGA within the PGA_AGGREGATE_TARGET This parameter defaults to the greater of 10 MB or 20 percent of the size of the SGA and should be adjusted upward
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until a satisfactory proportion of statements are executing optimally, but not set so high that memory is over-allocated and the operating system has to page virtual memory to disk For many systems, the default for PGA_AGGREGATE_TARGET will be far too low for optimal performance Some DBAs set it equal to the size of the SGA, and tune from there
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The SGA contains several memory structures, which can be sized independently These are
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The shared pool The database buffer cache The large pool The Streams pool The Java pool The log buffer
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As a general rule, the memory allocation to the large pool, the Java pool, and the Streams pool is not a matter for negotiation either the memory is needed or it isn t If these structures are undersized, there will be errors; if they are oversized, there will be no performance improvement The memory allocation to the shared pool, the database buffer cache, and the log buffer is negotiable: if less than optimal, there will not be errors but performance will degrade The exception is the shared pool: if this is chronically undersized, there will be errors Do not throw memory at Oracle unnecessarily An oversized shared pool or log buffer is seriously bad for performance An oversized buffer cache is less likely to be a problem, unless it is so oversized that the system is having to swap SGA memory management can be automatic (and Oracle Corporation advises that it should be) with the exception of the log buffer The DBA sets a total size for the SGA, and the instance will apportion this total to the various structures, ensuring that there are no errors from undersizing of SGA components and that memory above this minimum is allocated where it will do most good The components will be resized on demand, so that if a component needs more memory,
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