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Setting buffer cache size server switches
Specifying page size
Setting the page size
3
Make sure all users are disconnected from the database, and stop the
database.
•
If the
command-line switch is set, the database shuts down
-ga
automatically after the last user disconnects.
•
If
is not set, stop the database, by using the
-ga
UNIX, or by clicking Shutdown on the database server display on
Windows NT.
4
Restart the database. The new cache sizes are now in effect.
It is important to have an appropriate
Note
options. Otherwise, when the database server is restarted they will revert to the
default settings, which are far too low for most applications.
Normally you change the buffer cache sizes by setting the
MAIN_CACHE_MEMORY_MB
options. However, if you set these parameters to a value that is higher than your
system will accommodate, you will not be able to open the database. If this
occurs, use the server startup options
buffer cache sizes. These parameters only remain in effect while the server is
running, so you still need to set the buffer cache size database options.
When you create a database, you set its page size. This parameter, in
conjunction with the size of the buffer cache, determines memory use and disk
I/O throughput for that database.
Adaptive Server IQ swaps data in and out of memory in units of pages. When
you create a database, you specify a separate page size for the Catalog Store
and the IQ Store. The Temporary Store has the same page size as the IQ Store.
For IQ page size recommendations for the best performance, see "Choosing an
IQ page size" on page 111.
CHAPTER 12
Managing System Resources
setting of the cache size
PUBLIC
and
TEMP_CACHE_MEMORY_MB
and
to change the current
-iqmc
-iqtc
utility on
stop_asiq
database
429
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