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MS SQL

Posted Jun 25, 1998

Upgrading - Page 15

By Sharon Dooley

25 Jan 98

Upgrading

Upgrades must be from 6.x. 4.2 must be upgraded to 6.x first.

Can be done on one machine or onto a different machine.

Replication allows all combinations of 6.0, 6.5 and 7.0 to work together. Servers involved in replication can be upgraded in any order but a separate distribution server must be upgraded first.

The upgrade is managed with a wizard.

Upgrade speeds (using a server-server pipeline, not tape, which is also supported):

1G -- < 1 hour

10 G -- < 4 hours

50 G -- < 12 hours

100G -- < 24 hours

Microsoft reports that upgrading their 80GB SAP server took 14.5 hours. If you use tape, it will take roughly twice as long.

A compatibility mode will be automatically set for 6.x databases. This will

Prevent keyword conflicts

Have an implicit ORDER BY for GROUP BY

Provide 6.x treatment of empty strings

Replicate an obscure bug in the UPDATE statement

Most upgrade problems to date have been

Applications which made direct access to system tables 17%

Problems already present in user objects which were manifest when the object was upgraded 6%

No other problem has appeared in more than 1% of the tests


 

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

 



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