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Finding rows count in a table without Select...


Finding rows count in a table without Select...

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garyg-755799
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From my testing of these scripts, the row counts are only accurate if the table has a clustered index.

Gary
Greg Milner
Greg Milner
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I believe the WHERE clause here:
Where indid < 2
means that it's on the clustered index. So wouldn't it alway be accurate regardless of statics, since that's the actual physical layout of the rows?

Let me know if that's not correct.

Thanks.



G. Milner
Greg Milner
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Hi, Manish.
I turned an email I wrote -- based on your post -- to a colleague (ETL designer) into a blog post on my site here, and cited you. Hope that's OK.

Thanks.



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garyg-755799
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Regarding the clause "Where indid < 2", if you have a clustered index there will be a row in sysindexes with indid = 1. If you do not have a clustered index, there will be a row in sysindexes = 0.

From my testing, only the tables with a clustered index (indid = 1) are accurate.

Gary
Jeff Moden
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If you need more accurate results, try using DBCC UPDATEUSAGE first. If you haven't done it in awhile, it could take some good bit of time and will take less time the more you use it.

--Jeff Moden

RBAR is pronounced ree-bar and is a Modenism for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column.
If you think its expensive to hire a professional to do the job, wait until you hire an amateur. -- Red Adair

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Chris Howarth-536003
Chris Howarth-536003
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DBCC UPDATEUSAGE - doesn't that only have to be run on SQL 2000 or upon upgrade from 2000 -> 2005?

I thought the issue had been corrected in 2005 onwards?

DBCC UPDATEUSAGE BOL quote:

"In SQL Server 2005, these values are always maintained correctly. Databases created on SQL Server 2005 should never experience incorrect counts, however, databases upgraded to SQL Server 2005 may contain invalid counts."

As I mentioned before, using sys.dm_db_partition_stats is the most reliable, future-proof method.

Chris
Jeff Moden
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Chris Howarth-536003 (3/27/2010)
DBCC UPDATEUSAGE - doesn't that only have to be run on SQL 2000 or upon upgrade from 2000 -> 2005?

I thought the issue had been corrected in 2005 onwards?

DBCC UPDATEUSAGE BOL quote:

"In SQL Server 2005, these values are always maintained correctly. Databases created on SQL Server 2005 should never experience incorrect counts, however, databases upgraded to SQL Server 2005 may contain invalid counts."

As I mentioned before, using sys.dm_db_partition_stats is the most reliable, future-proof method.

Chris


Actually, that's exactly correct, Chris. I've been stuck in a 2k world for much too long. Being in a bit of a hurry, all I saw was a reference to sysindexes and the word "inaccurate" and didn't realize folks were talking of 2k5+.

--Jeff Moden

RBAR is pronounced ree-bar and is a Modenism for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column.
If you think its expensive to hire a professional to do the job, wait until you hire an amateur. -- Red Adair

Helpful Links:
How to post code problems
How to post performance problems
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Johnc
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DBCC UPDATEUSAGE - doesn't that only have to be run on SQL 2000 or upon upgrade from 2000 -> 2005?


Actually that may provide the explanation. My original post was about inaccurate counts in a 2000 database I had migrated to 2008 and I didn't know about the caveat, so that may well be the answer.

Thanks Jeff, Chris (and All)



Yanko Nikolov
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Hello
This is the cool example, but you do not need to write own procedure to determine the tables row count. Just try this:

exec SP_MSFOREACHTABLE @command1=N' exec SP_SPACEUSED ''?'' '

Regards
Yankov Yanko
krassimir.kotzev
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And th equestion again: How recent are your statistics, indexes, etc. ? If you can not tell, better use count(*) to get the numbers. It is slow but accurate.
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