Is Tempdb Big Enough For What I'm Doing, Plus Other Questions.

Jul 20, 2005

Hi All,

First, where can I get some questions of this sort answered?
Preferably, are there good books or online guides that I can consult for
these types of answers when necessary?

1. How do I know, when executing a query from Query Analyzer or
otherwise, how many temporary tables will be needed, and how big they
will be?
2. Where will those temporary tables be created? Always in tempdb?
3. If part of the estimated execution plan in Query Analyzer involves a
"Hash Match/Inner Join" with an estimated row count of 5 million, how
many tables will be created along the way?
4. What happens if tempdb doesn't have enough space to create a
temporary table in its entirety?
5. etc.

Those are just examples. I guess what I need is a good book on
query/script optimization, including selects, deletes, updates, etc,
that I can reference that will describe to me what is going on
internally when certain execution plans are executed.

Not only how to write optimized queries (use SARGs, etc), but why to
write a query one way over another.

Second, my current question regards an UPDATE I'm trying to get to run
in a reasonable amount of time.

It has to update 11 million rows of a 175 million row table. I did the
math, and with each record containing 220 bytes of data, a temporary
table of all the rows would take up 33+ gigs. If, by chance, such an
update creates a temporary table with the full 175 million rows, what
happens if the partition tempdb.mdf resides on is only 28 gig in size,
etc?

I hope that made some sense, and thanks.

Warren Wright
Dallas

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Hello All~

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Front End - Great Plains
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database_name database_size unallocated space
------------------------------ ------------------ ------------------
tempdb 1502.00 MB -6301.82 MB

reserved data index_size unused
------------------ ------------------ ------------------ ------------------
7991108 KB 7996222 KB 72 KB -5186 KB


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