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ops$tkyte%ORA11GR2> show parameter sga_target NAME TYPE VALUE ------------------------------------ ----------- -----------------------------sga_target big integer 256M ops$tkyte%ORA11GR2> select component, granule_size from v$sga_dynamic_components; COMPONENT GRANULE_SIZE ---------------------------------------------------------------- -----------shared pool 4194304 large pool 4194304 java pool 4194304 streams pool 4194304 DEFAULT buffer cache 4194304 KEEP buffer cache 4194304 RECYCLE buffer cache 4194304 DEFAULT 2K buffer cache 4194304 DEFAULT 4K buffer cache 4194304 DEFAULT 8K buffer cache 4194304 DEFAULT 16K buffer cache 4194304 DEFAULT 32K buffer cache 4194304 Shared IO Pool 4194304 ASM Buffer Cache 4194304 14 rows selected.
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Note This is the SGA information for the Oracle instance started with the initialization parameter file in the
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previous example. We specified the SGA and PGA sizes ourselves in that parameter file. Therefore we are using automatic SGA memory management and automatic PGA memory management, but not the new in Oracle 11g memory management setting, which would have sized and resized our PGA/SGA settings for us.
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In this example, I used automatic SGA memory management and controlled the size of the SGA via the single parameter SGA_TARGET. When my SGA size is under about 1GB, the granule is 4MB. When the SGA size is increased to some threshold over 1GB (it will vary slightly from operating system to operating system and even from release to release), I see an increased granule size. First we convert to using a stored parameter file to make altering the SGA_TARGET easier: sys%ORA11GR2> create spfile from pfile; File created. sys%ORA11GR2> startup force; ORACLE instance started. Total System Global Area Fixed Size Variable Size Database Buffers 267825152 1335924 130026892 130023424 bytes bytes bytes bytes
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Redo Buffers Database mounted. Database opened.
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Then we modify the SGA_TARGET: sys%ORA11GR2> alter system set sga_target = 1512m scope=spfile; System altered. sys%ORA11GR2> startup force ORACLE instance started. Total System Global Area 1590267904 bytes Fixed Size 1336792 bytes Variable Size 218106408 bytes Database Buffers 1358954496 bytes Redo Buffers 11870208 bytes Database mounted. Database opened. sys%ORA11GR2> show parameter sga_target NAME TYPE VALUE ------------------------------------ ----------- -----------------------------sga_target big integer 1520M Now when we look at the SGA components: sys%ORA11GR2> 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 Shared IO Pool 16777216 ASM Buffer Cache 16777216 14 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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Fixed SGA
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, as well as variables that contain the values of various parameters. The size of the fixed SGA is something over which we have no control, 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.
Redo Buffer
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 than 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 tens of megabytes in size. A large system with lots of concurrent transactions might 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 (we ll cover this phenomenon of writing uncommitted data to the datafiles at length in 9 Redo and Undo ). 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, varies widely by operating system, database version, and other parameter settings. Rather than try to explain what the most common default size is (there isn t such a thing), I ll refer you to the documentation for your release of Oracle (the Reference Guide). My default LOG_BUFFER given the instance we just started above with a 1.5GB SGA is shown by the following query: ops$tkyte%ORA11GR2> select value, isdefault 2 from v$parameter 3 where name = 'log_buffer' 4 / VALUE ISDEFAULT -------------------- --------11583488 TRUE The size is about 11MB. The minimum size of the default log buffer is OS-dependent. If you d 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:
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