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Help with getting a Table Count across multiple DBs Expand / Collapse
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Posted Friday, December 27, 2013 10:04 AM
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Hello,

I'm not all that familiar with SQL scripting, I can usually figure stuff out, however I'm stuck on a project at work and have been searching for an answer with no luck. It may not ever be possible.

We have a SQL Server 2008 with approx 500 client DB's on them There is a specific Table called "CurrentUsers". What I'm trying to achieve is, I need to run this query on that table (Select Count (*) from CurrentUsers), which tells me how many users our on the application. The part here is I need to run this against ALL DB's (not including the system dbs), and have it give me a Sum of ALL CurrentUsers from all the DB's.

Is this even possible?

Thanks a bunch!!!

Don
Post #1526218
Posted Friday, December 27, 2013 10:30 AM


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Here's a code to show you how can it be done. You might need to fix it.
DECLARE @dbname sysname

CREATE TABLE #counts( totalcounts int)

DECLARE DBs CURSOR FOR
SELECT name
FROM sys.databases
WHERE database_id > 4
AND state = 0

OPEN DBs
FETCH NEXT FROM DBs INTO @dbname

WHILE @@FETCH_STATUS = 0
BEGIN
EXECUTE( 'INSERT INTO #counts SELECT COUNT(*) FROM [' + @dbname + '].sys.tables' )

FETCH NEXT FROM DBs INTO @dbname
END
CLOSE DBs
DEALLOCATE DBs

SELECT SUM(totalcounts)
FROM #counts

DROP TABLE #counts




Luis C.
Are you seriously taking the advice and code from someone from the internet without testing it? Do you at least understand it? Or can it easily kill your server?

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Post #1526223
Posted Friday, December 27, 2013 10:59 AM
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I don't know how you guys know this stuff off the top of you head like this... Worked like a charm!!!! You just saved me a ton of time! Thank you Thank you Thanks you!!!!!!!
Post #1526227
Posted Friday, December 27, 2013 11:04 AM


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my version is just an adaptation of Luis's: i'm just selecting the rows form the indexes, as the count is already materialized, and is faster on huge tables.

Thank you Luis for 99% of the code!

DECLARE @cmd VARCHAR(MAX),
@dbname VARCHAR(128)

CREATE TABLE #counts( DatabaseName VARCHAR(128),totalcounts INT)

DECLARE DBs CURSOR FOR
SELECT name
FROM sys.databases
WHERE database_id > 4
AND STATE = 0

OPEN DBs
FETCH NEXT FROM DBs INTO @dbname

WHILE @@FETCH_STATUS = 0
BEGIN

SET @cmd = '

INSERT INTO #counts(DatabaseName,totalcounts)
SELECT
''' + @dbname + ''' AS DatabaseName,
SUM(ROWS) AS NumRows
FROM ' + QUOTENAME(@dbname) + '.sys.partitions p
INNER JOIN ' + QUOTENAME(@dbname) + '.sys.sysobjects o
ON p.object_id = o.id
WHERE p.index_id IN (0,1)
AND o.type = ''U''
AND o.name = ''CurrentUsers''
GROUP BY p.OBJECT_ID,p.index_id '
PRINT @cmd
EXEC(@cmd)
FETCH NEXT FROM DBs INTO @dbname
END
CLOSE DBs
DEALLOCATE DBs

SELECT * FROM #counts
SELECT SUM(totalcounts) FROM #counts

drop table #counts






Lowell

--There is no spoon, and there's no default ORDER BY in sql server either.
Actually, Common Sense is so rare, it should be considered a Superpower. --my son
Post #1526230
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