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Posted Jun 26, 1998

Configuration - Page 4

By Sharon Dooley

25 Jan 98

SQL Server 7.0 has dynamic memory management and dynamic disk space management. In the area of memory management, it cooperates with the operating system and takes or gives back memory based on what is happening at any given time. There is a single buffer pool shared by many different DBMSs.

Databases can be set up to autogrow and autoshrink. The example presented was a Sales History table, which starts out at 128 MB at the beginning of the year. Through the year, it grows to 4 GB automatically as data is added. In January of the following year, the history is purged and the table shrinks back to 128 MB. The freed pages are given back to the operating system.

There is an autoupdate facility for the optimizer statistics. This is not a performance drain as it uses a sampling technique rather than scanning the entire table. Paul Flessner stated that this technique is almost instant and produces good information on selectivity and cardinality.

One presenter noted that 20 configuration options are gone. User connections is supposed to be gone by the next beta.

Many thanks to Sharon for providing these notes - drop her a note at sharond@compuserve.com and tell her thanks!

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