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CHAPTER 4 MEMORY STRUCTURES
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sys@ORA10G> alter system set sga_target = 1512m scope=spfile; System altered. sys@ORA10G> startup force ORACLE instance started. Total System Global Area 1593835520 bytes Fixed Size 779316 bytes Variable Size 401611724 bytes Database Buffers 1191182336 bytes Redo Buffers 262144 bytes Database mounted. Database opened. sys@ORA10G> select component, granule_size from v$sga_dynamic_components; COMPONENT GRANULE_SIZE ------------------------- -----------shared pool 16777216 large pool 16777216 java pool 16777216 streams pool 16777216 DEFAULT buffer cache 16777216 KEEP buffer cache 16777216 RECYCLE buffer cache 16777216 DEFAULT 2K buffer cache 16777216 DEFAULT 4K buffer cache 16777216 DEFAULT 8K buffer cache 16777216 DEFAULT 16K buffer cache 16777216 DEFAULT 32K buffer cache 16777216 OSM Buffer Cache 16777216 13 rows selected. As you can see, at 1.5GB of SGA, my pools will be allocated using 16MB granules, so any given pool size will be some multiple of 16MB. With this in mind, let s look at each of the major SGA components in turn.
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The fixed SGA is a component of the SGA that varies in size from platform to platform and from release to release. It is compiled into the Oracle binary itself at installation time (hence the name fixed ). The fixed SGA contains a set of variables that point to the other components of the SGA, and variables that contain the values of various parameters. The size of the fixed SGA is something with which we have no control over, and it is generally very small. Think of this area as a bootstrap section of the SGA something Oracle uses internally to find the other bits and pieces of the SGA.
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CHAPTER 4 MEMORY STRUCTURES
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The redo buffer is where data that needs to be written to the online redo logs will be cached temporarily, before it is written to disk. Since a memory-to-memory transfer is much faster then a memory-to-disk transfer, use of the redo log buffer can speed up database operation. The data will not reside in the redo buffer for very long. In fact, LGWR initiates a flush of this area in one of the following scenarios: Every three seconds Whenever someone commits When LGWR is asked to switch log files When the redo buffer gets one-third full or contains 1MB of cached redo log data For these reasons, it will be a very rare system that will benefit from a redo buffer of more than a couple of megabytes in size. A large system with lots of concurrent transactions could benefit somewhat from large redo log buffers because while LGWR (the process responsible for flushing the redo log buffer to disk) is writing a portion of the log buffer, other sessions could be filling it up. In general, a long-running transaction that generates a lot of redo log will benefit the most from a larger than normal log buffer, as it will be continuously filling up part of the redo log buffer while LGWR is busy writing out some of it. The larger and longer the transaction, the more benefit it could receive from a generous log buffer. The default size of the redo buffer, as controlled by the LOG_BUFFER parameter, is whatever is the greater of 512KB and (128 * number of CPUs)KB. The minimum size of this area is OS dependent. If you would like to find out what that is, just set your LOG_BUFFER to 1 byte and restart your database. For example, on my Red Hat Linux instance I see the following: sys@ORA10G> alter system set log_buffer=1 scope=spfile; System altered. sys@ORA10G> startup force ORACLE instance started. Total System Global Area 1593835520 bytes Fixed Size 779316 bytes Variable Size 401611724 bytes Database Buffers 1191182336 bytes Redo Buffers 262144 bytes Database mounted. Database opened. sys@ORA10G> show parameter log_buffer NAME TYPE VALUE ------------------------------------ ----------- -----------------------------log_buffer integer 262144 The smallest log buffer I can really have, regardless of my settings, is going to be 256KB on this system.
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