September 30, 2007 at 11:02 pm
Comments posted to this topic are about the item List all indexes with keys, description and size
January 4, 2008 at 2:30 am
While trying to find more about sizes of specific indexes, unlike the sum of used space as returned with sp_spaceused, I changed the queries used by sp_spaceused a bit to return individual index sizes.
At a first glans the sum of the returned sizes seems to fit the sum returned by sp_spaceused itself, so this query could be adapted to filter a specific index name (joined with sys.indexes) etc.
Maybe someone else is trying to find out about specific index sizes too, so you might have a look (still trying to restructure this query a bit, too make it smoother, this is just a first shot 😉 ):
SELECT
reserved_page_count,
used_page_count,
CASE
WHEN (index_id < 2) THEN (in_row_data_page_count + lob_used_page_count + row_overflow_used_page_count)
ELSE lob_used_page_count + row_overflow_used_page_count
END pages,
CASE
WHEN (index_id < 2) THEN row_count
ELSE 0
END rows,
LTRIM (STR ((CASE WHEN used_page_count >
(CASE
WHEN (index_id < 2) THEN (in_row_data_page_count + lob_used_page_count + row_overflow_used_page_count)
ELSE lob_used_page_count + row_overflow_used_page_count
END)
THEN (used_page_count -
(CASE
WHEN (index_id < 2) THEN (in_row_data_page_count + lob_used_page_count + row_overflow_used_page_count)
ELSE lob_used_page_count + row_overflow_used_page_count
END))
ELSE 0 END) * 8, 15, 0) + ' KB') indexsize
FROM sys.dm_db_partition_stats
WHERE object_id = 546100986 -- filter for object_id of a table here
AND index_id in (1,2,5)
January 4, 2008 at 6:04 am
After putting together the previous query, I came along this undocumented sp:
sp_MSIndexSpace tablename
which also returns the sizes for each single index. Just in case anyone's looking for that... 🙂
September 11, 2008 at 9:26 am
After hours of looking around on the net, I found this script, copied it and immediately ran it. Let me just add that I am by now means a DBA or anything similar.
When the results came back, I copied it to Excel and summed it. It came up with a total of 19Gb worth of indexes. I thought that this couldn't be as te database is 24Gb in total. I ran the sp_spaceused against a specific table and compared the two. The results were:
Index Name Size (sp_spaceused) Size (your script)
----------------------------------------------------------------------------
PK_CustID 7872KB 2277
So this leaves me unsure as to what the size actually is. Is it 7.69Mb or 2.22Gb. Could you clarify this for me, please?
Thanks
September 12, 2008 at 1:11 am
Hello Willie,
you're right, the result from sp_spaceused might differ from the query, since the query itself doesn't add xml indexes or fulltext indexes for the given table, in contrast to sp_spaceused. I didn't need these so I left them away.
Anyway, I modified the query so you can query for a tablename and only one index in this table if desired. If I find some time, I'll add the query for fulltext and xml index space too.
BTW, the original query wasn't put together by me, but it's also a part of the sp_spaceused sys storeproc (sp_helptext 'sp_spaceused'), I just put it together for a quick view while performance tuning a database.
Regards
/*** Show index sizes for each index of a table ***/
SELECTo.name TableName, i.name IndexName, reserved_page_count, used_page_count,
CASE
WHEN (s.index_id < 2) THEN (in_row_data_page_count + lob_used_page_count + row_overflow_used_page_count)
ELSE lob_used_page_count + row_overflow_used_page_count
END pages,
row_count,
LTRIM (STR ((CASE WHEN used_page_count >
(CASE
WHEN (s.index_id < 2) THEN (in_row_data_page_count + lob_used_page_count + row_overflow_used_page_count)
ELSE lob_used_page_count + row_overflow_used_page_count
END)
THEN (used_page_count -
(CASE
WHEN (s.index_id < 2) THEN (in_row_data_page_count + lob_used_page_count + row_overflow_used_page_count)
ELSE lob_used_page_count + row_overflow_used_page_count
END))
ELSE 0 END) * 8, 15, 0) + ' KB') IndexSize
FROM sys.dm_db_partition_stats s
INNER JOIN sys.objects o ON o.object_id = s.object_id
INNER JOIN sys.indexes i ON i.object_id = o.object_id and s.index_id = i.index_id
WHERE o.name = 'TableName'
--AND i.name = 'IndexName' -- use this to query size of one index in the table
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