08-11-2009
Quote:
Originally Posted by
zxmaus
Assuming you want to assign a SGA of any size to your database, 1 GB memory will hardly be sufficient or the system so slow that nobody can work with it.
zxmaus is of course correct for purposes of a production or near-production systems. For testing purposes you can tweak the SGA to use a lot less of space (all these changes of course mean a heavy decay of performance). A good start to tune for less memory consumption is DB_BLOCK_BUFFERS, which is basically the DBs disk cache. Since the OS caches disk I/O anyways it is sort of redundant (for testing!!).
I hope this helps.
bakunin
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LEARN ABOUT OSX
cacheinfo
CACHEINFO(5) AFS File Reference CACHEINFO(5)
NAME
cacheinfo - Defines configuration parameters for the Cache Manager
DESCRIPTION
The cacheinfo file defines configuration parameters for the Cache Manager, which reads the file as it initializes.
The file contains a single line of ASCII text and must reside in the /etc/openafs directory. Use a text editor to create it during initial
configuration of the client machine; the required format is as follows:
<mount>:<cache>:<size>
where
<mount>
Names the local disk directory at which the Cache Manager mounts the AFS namespace. It must exist before the afsd program runs. The
conventional value is /afs. Using any other value prevents traversal of pathnames that begin with /afs (such as pathnames to files in
foreign cells that do use the conventional name). The -mountdir argument to the afsd command overrides this value.
<cache>
Names the local disk directory to use as a cache. It must exist before the afsd program runs. The standard value is /usr/vice/cache,
but it is acceptable to substitute a directory on a partition with more available space. Although the Cache Manager ignores this field
when configuring a memory cache, a value must always appear in it. The -cachedir argument to the afsd command overrides this value.
<size>
Specifies the cache size as a number of 1-kilobyte blocks. Larger caches generally yield better performance, but a disk cache must not
exceed 90% of the space available on the cache partition (85% for AIX systems), and a memory cache must use no more than 25% of
available machine memory.
The -blocks argument to the afsd command overrides this value. To reset cache size without rebooting on a machine that uses disk
caching, use the fs setcachesize command. To display the current size of a disk or memory cache between reboots, use the fs
getcacheparms command.
EXAMPLES
The following example cacheinfo file mounts the AFS namespace at /afs, establishes a disk cache in the /usr/vice/cache directory, and
defines cache size as 50,000 1-kilobyte blocks.
/afs:/usr/vice/cache:50000
SEE ALSO
afsd(8), fs_getcacheparms(1), fs_setcachesize(1)
COPYRIGHT
IBM Corporation 2000. <http://www.ibm.com/> All Rights Reserved.
This documentation is covered by the IBM Public License Version 1.0. It was converted from HTML to POD by software written by Chas
Williams and Russ Allbery, based on work by Alf Wachsmann and Elizabeth Cassell.
OpenAFS 2012-03-26 CACHEINFO(5)