>I just wonder, what will happen after shrinking the database? Will the size
>stays permanently? Is this the "size" that we declare the database devices
>at the initial part before creating the database?

Yes. SQL Server 6.5 does not have the ability to dynamically resize database storage like 7.0. If you find that you're almost out of space, you'll have to resize the database using the SEM or the ALTER DATABASE command.

>Another question, when will the "Expand" and "Shrink" of databases be required?

Under normal conditions, a DBA will use expand the database more that shrink it. How often will depend on the growth. Monitor you database space usages on a daily basis and you'll be able to determine at least a gross indicator of growth.

-Mike