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Posted Tuesday, September 7, 2010 7:51 PM


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I'd like to determine which fields are LOB?

______________________________________________________________________________
"Never argue with an idiot; They'll drag you down to their level and beat you with experience"
Post #982006
Posted Tuesday, September 7, 2010 10:57 PM
Old Hand

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TRY THIS

select * from sys.syscolumns
where length IN (16,8000,-1)
Post #982039
Posted Tuesday, September 7, 2010 11:26 PM


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luckysql.kinda (9/7/2010)
select * from sys.syscolumns
where length IN (16,8000,-1)


Syscolumns is deprecated, should not be used for new development and will be removed in a future version of SQL.

That query also returns all Uniqueidentifier columns (which are 16 bytes), varchar and varbinary 8000 (which are not LOB) and any varchar(16) or varbinary (16)



Gail Shaw
Microsoft Certified Master: SQL Server 2008, MVP
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

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Post #982047
Posted Tuesday, September 7, 2010 11:35 PM


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This should work

SELECT OBJECT_NAME(c.object_id), c.name, t.name 
FROM sys.columns c
INNER JOIN sys.types t ON c.user_type_id = t.user_type_id
WHERE t.name IN ('text','ntext','image','xml')
OR (t.name IN ('varchar','nvarchar','varbinary') AND c.max_length = -1)




Gail Shaw
Microsoft Certified Master: SQL Server 2008, MVP
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

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Post #982048
Posted Wednesday, September 8, 2010 12:57 AM


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Microsoft recommends the use of the INFORMATION_SCHEMA views in lieu of system tables, as they reserve the right to change said tables, while the views remain relatively static.
select TABLE_SCHEMA, TABLE_NAME, COLUMN_NAME, DATA_TYPE, CHARACTER_MAXIMUM_LENGTH 
from INFORMATION_SCHEMA.COLUMNS
where DATA_TYPE in ('text','ntext','image','xml')
OR (DATA_TYPE in ('varchar','nvarchar','varbinary') AND CHARACTER_MAXIMUM_LENGTH = -1)



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Post #982072
Posted Wednesday, September 8, 2010 1:50 AM


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stewartc-708166 (9/8/2010)
Microsoft recommends the use of the INFORMATION_SCHEMA views in lieu of system tables

Got a reference that states that?

sys.columns, sys.tables, etc are not system tables. They're catalog views and they exist so that MS can change the underlying system tables (which aren't even visible) without breaking code.

From Books Online (http://msdn.microsoft.com/en-us/library/ms174365%28v=SQL.100%29.aspx):
Catalog views return information that is used by the SQL Server Database Engine. We recommend that you use catalog views because they are the most general interface to the catalog metadata and provide the most efficient way to obtain, transform, and present customized forms of this information. All user-available catalog metadata is exposed through catalog views.




Gail Shaw
Microsoft Certified Master: SQL Server 2008, MVP
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

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Post #982093
Posted Wednesday, September 8, 2010 10:40 AM


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Thanks for the quick replies!

I will try this out


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Post #982482
Posted Friday, September 10, 2010 7:51 PM


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If you are still interested, I have a query I have been working on (still working on it to get it faster) that will report show you indexes with LOB columns, the size there and the allocation unit type associated with that column. It does not return the same number of columns as Gail's query - but that is likely due to the integration with indexes that I am trying to report on with this one.

Work in progress:
CREATE TABLE #indstats (
indstatsid INT IDENTITY(1,1) PRIMARY KEY CLUSTERED
,database_id BIGINT
,Object_id BIGINT
,index_id BIGINT
,IndexSizeMB DECIMAL(16,1)
)

INSERT INTO #indstats (database_id,object_id,index_id,IndexSizeMB)
SELECT database_id,object_id,index_id
,CONVERT(DECIMAL(16,1)
,(SUM(ps.avg_record_size_in_bytes * ps.record_count) / (1024.0 * 1024))) AS IndexSizeMB
FROM sys.dm_db_index_physical_stats(DB_ID(),null,NULL,NULL,'DETAILED') ps
GROUP BY database_id,object_id,index_id
;

With LOBCols as (
Select FileGroupName = filegroup_name(a.data_space_id)
,TableName = object_name(p.object_id)
,p.object_id
,IndexName = i.name
,ColumnName = c.name
,c.column_id
,LOBUsedPages = a.used_pages
,LOBTotalPages = a.total_pages
,LOBDataSizeMB = a.used_pages * 8/1024
, ps.IndexSizeMB
, (us.user_seeks + us.user_scans + us.user_lookups) AS UserRequests
, (us.user_updates) AS UserUpdates
, us.last_user_update AS LastUpdate
, CAST(us.user_seeks + us.user_scans + us.user_lookups AS REAL)
/ CAST(CASE us.user_updates WHEN 0 THEN 1 ELSE us.user_updates END AS REAL) AS RatioRequestsToUpdates
,a.type_desc as AllocUnitType
From sys.allocation_units a
Inner Join sys.partitions p
On p.partition_id = a.container_id
And a.type = 2 --LOB data is stored in pages of type Text/Image
Left Outer Join sys.dm_db_index_usage_stats us
On us.object_id = p.object_id
And us.index_id = p.index_id
And us.database_id = db_id()
Left Outer Join #indstats ps
ON us.index_id = ps.index_id
And us.database_id = ps.database_id
And us.object_id = ps.object_id
Left Outer Join sys.indexes i
On i.object_id = p.object_id
And i.index_id = p.index_id
Left Outer Join sys.index_columns ic
On i.index_id = ic.index_id
And i.object_id = ic.object_id
Left Outer Join sys.columns c
On ic.object_id = c.object_id
And ic.column_id = c.column_id
Where OBJECTPROPERTY(p.object_id,'IsMSShipped') = 0
--And a.data_pages > 0
--And filegroup_name(a.data_space_id) = 'Primary'
Union
Select FileGroupName = filegroup_name(a.data_space_id)
,TableName = object_name(p.object_id)
,p.object_id
,IndexName = i.name
,ColumnName = c.name
,c.column_id
,LOBUsedPages = a.used_pages
,LOBTotalPages = a.total_pages
,LOBDataSizeMB = a.used_pages * 8/1024
, ps.IndexSizeMB
, (us.user_seeks + us.user_scans + us.user_lookups) AS UserRequests
, (us.user_updates) AS UserUpdates
, us.last_user_update AS LastUpdate
, CAST(us.user_seeks + us.user_scans + us.user_lookups AS REAL)
/ CAST(CASE us.user_updates WHEN 0 THEN 1 ELSE us.user_updates END AS REAL) AS RatioRequestsToUpdates
,a.type_desc as AllocUnitType
From sys.allocation_units a
Inner Join sys.partitions p
On p.hobt_id = a.container_id
And a.type = 3 --Overflow data is stored in pages of type Text/Image
Left Outer Join sys.dm_db_index_usage_stats us
On us.object_id = p.object_id
And us.index_id = p.index_id
And us.database_id = db_id()
Left Outer Join #indstats ps
ON us.index_id = ps.index_id
And us.database_id = ps.database_id
And us.object_id = ps.object_id
Left Outer Join sys.indexes i
On i.object_id = p.object_id
And i.index_id = p.index_id
Left Outer Join sys.index_columns ic
On i.index_id = ic.index_id
And i.object_id = ic.object_id
Left Outer Join sys.columns c
On ic.object_id = c.object_id
And ic.column_id = c.column_id
Where OBJECTPROPERTY(p.object_id,'IsMSShipped') = 0
--And filegroup_name(a.data_space_id) = 'Primary'
--And a.data_pages > 0

)

Select L.FileGroupName,L.TableName,L.IndexName,L.ColumnName,L.LOBUsedPages,L.LOBTotalPages,L.LOBDataSizeMB,L.IndexSizeMB
,L.UserRequests,L.LastUpdate,L.RatioRequestsToUpdates,L.AllocUnitType,t.name
From LOBCols L
Inner Join sys.columns c
On c.object_id = L.object_id
And c.column_id = L.column_id
Inner Join sys.types t
On t.user_type_id = c.user_type_id
Order By L.TableName asc,L.AllocUnitType





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