SQL 2012 :: How / When To Update Stats After Data Load

Mar 24, 2015

We have a file import job. This job typically imports millions of records into a SQL2008 DB. After the load the DB performance goes down the drain. Thus far, their solution has been to rebuild indexes on effected tables. I'd like to come up with a better solution. My guess is that after the load, the statistics are shot until the next stats update.

What is the best way to handle this scenario? There must be some way to keep the stats current during a big data load.

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SQL 2012 :: Index Maintenance And Update Stats

Jul 22, 2014

I am using Ola Hallengrens scripts for index and stats maintenance but I am wondering what most people to in terms of the maintenance schedules. At present we do an index rebuild reorg weekly, but do people also do update stats nightly?

I suppose there is an element of "it depends" here in that the data may be fairly static so the update stats may not be required, or if heavily updated then perhaps rebuilding indexes may be required more frequently.

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SQL 2012 :: Update Stats Full Scan And Memory

Apr 9, 2014

I noticed today a session that was executing a FULL SCAN update as follows:

UPDATE STATISTICS [XXXX].[XXXX].[XXXX] [_WA_Sys_00000009_318D45CA] WITH FULLSCAN

When I checked the sys.dm_exec_query_memory_grants DMV for the session I could see the following values:

requested_memory_kb granted_memory_kb used_memory_kb max_used_memory_kb
145,705,216 145,705,216 139,977,336 139,980,408

When I checked the Properties of the Statistic I can see it is on a varchar(3) field when there are only 3 different values in there - all char(1)

The total size of the data in the table according to the Disk Usage By Top Table Report is 199,680,712KB

So my question is this...

For the UPDATE STATS on this one column with FULL SCAN, does SQL Server read the entire table into the Buffer Pool. If so then if the table had 199,680,712KB of data then why did the session request 145,705,216KB.

Or does SQL Server just read the column and ClusteredIndex Key into the Buffer Pool?

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SQL 2012 :: Index Rebuild Job Fails Periodically At Update Stats?

Mar 18, 2015

I have a job that runs nightly, rebuild index. job runs fine every night but every few weeks it fails.

USE msdb
GO
EXECUTE dbo.IndexOptimize
@Databases = 'USER_DATABASES',
@FragmentationLow = NULL,
@FragmentationMedium = 'INDEX_REORGANIZE,INDEX_REBUILD_ONLINE,INDEX_REBUILD_OFFLINE',
@FragmentationHigh = 'INDEX_REBUILD_ONLINE,INDEX_REBUILD_OFFLINE',
@FragmentationLevel1 = 5,
@FragmentationLevel2 = 30,
@SortInTempdb = 'Y',
@UpdateStatistics = 'ALL',
@OnlyModifiedStatistics = 'Y'

This calls the Sp that does the Reindex. It fails at the update statistics with a very generic message. like " Command: UPDATE STATISTICS [xxxx_DB].[dbo].[xxxx_xxx] [_WA_Sys_00000007_49C3F6B7] [SQ... The step failed."

I suspect it has more error but this is all it is showing me when I right click on the job history. therefore, I updated the job step in the advance tab with log to a txt file. Am I on the right track or there is another way to see error some where else.

I looked at the logs but they didn't show any thing.

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How To Update Stats Of Tables When Insert Data Into It

Feb 17, 2012

How do i update the stats of tables when we insert data into it. I believe Auto stats update happens only when 500+ 20% of the rows are changed for a table. Once we insert say some 1000 records in to a particular table the query time takes too long (more than 1 min). The same query executes faster once i manually update the stats.

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Data Load And Update

Jan 21, 2008

I have to Load Contacts data from different systems into a single SQL Server 2005 table, the scenario is the following :

I have three systems System 1,System 2 and System 3

Step 1 Load Data From System 1
Step 2 Load Data from System 2 and if there are matching contacts with System 1, then match their details, keep System 1 details
Step 3 Load Data from System 3 and if there are matching contacts with System 2, then match their details and if different, flag them, do the same with System details.

The unique ids in the three systems are not the same so only way to match is to do a concatenation of name + address + zip code

Is there any other efficient way to do this...

Please advise

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Update Stats

Aug 11, 2004

Is it true that Update Statistics perform record commits if a query is outstanding?

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Update Stats

Aug 8, 2007

Has anyone noticed a performance improvement during trading hours when they replaced sp_updatestats with UPDATE STATISTICS FULLSCAN in their nightly maintenance?
Or is it negligible?

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Is It Possible To Mass Update Stats?

Apr 17, 2006

SQL Server 2000 on Win2k

I'm fairly new to SQL Server and I'm just wondering if it's possible to Update Statistice for all indexes somehow? I'm looking at the Update Statistics command and it doesn't seem to be possible.

The situation we have is a reporting DB that basically has all it's tables truncated and remade every night by some DTS jobs that import from another datasource and change the data and build some denormalzed tables etc.
Some of the large Insert operations go from taking 8 mins to taking several hours sometimes and updating the stats seems to fix the problem for a while. So I'd like to make sure the optimizer has all the latest stats for all tables.

Any other advice would be appreciated.

Cheers.

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SQL Server 2012 :: How To Load Historical Data From Old System Into A New One

Aug 12, 2014

I want to load historical data from an old system into a new one.Thing is, that old system stored dates as Datetime and the new one uses DateTimeOffset.

All data was collected in the same Time Zone... but with the Daylight Saving Time (DST)

The offset is either +04:00 or +05:00, based on the calendar date. To add to the complexity, the rules for DST changed a couple of years ago.

To determine the offset, I'd need to know what was or would have been the server Timezone for each historical date.

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Duration Of Auto Update Stats

Mar 10, 2003

Does anyone know how to tell how long it took for an auto update statistics to run? I looked under DBCC Show_Statistics and it shows the time the stats were last updated, but not how long it took to update them. Thanks.

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Indexing And Update Stats Script

Mar 12, 2015

I am having the following errors with the script below

Msg 102, Level 15, State 1, Line 44
Incorrect syntax near '?'.
Msg 319, Level 15, State 1, Line 47

Incorrect syntax near the keyword 'with'. If this statement is a common table expression, an xmlnamespaces clause or a change tracking context clause, the previous statement must be terminated with a semicolon. it also does not seem to loop around each db

DECLARE @commandNVARCHAR(MAX)
CREATE TABLE #worktable
(
[Database]SYSNAME
,SchemaNameSYSNAME
,ObjectNameSYSNAME
,StatsNameSYSNAME
,ColNameSYSNAME

[code]....

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SQL 2005 Performance And Update Stats

Nov 6, 2007

Recently we moved few of our databases from SQL 2000 to SQL 2005 (SP 2) using backup and restore. After the restore I did Reindex and update stats on the databases. Since then we have observed performance issues on SQL 2005 databases but this performance problem vanishes the moment we run (sp_updatestats). Is this a problem with SQL 2005 that we have to run sp_updatestats 2 times a days or 3 times a day. In SQL 2000 we ran it only Once a week and still we never had any performance issues. Is there any config change we need to do to fix this problem in SQL 2005?

Thanks !

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Does DBCC DBREINDEX Update Stats?

Sep 26, 2005

(Assuming SQL Server 2000, auto create statistics on, auto updatestatistics on.)DoesDBCC DBREINDEX(<tablename>)update statistics? If yes, are the statistics equivalent to thosethat would be produced by:UPDATE STATISTICS <tablename> WITH FULLSCAN

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SQL 2012 :: Encrypted Data In Project Manifest Failed To Load

Sep 8, 2015

An inherited SSIS (2012) solution displays the following messages when I try opening it in VS 2012:

"One or more projects in the solution were not loaded correctly."

Then another message displays

"The encrypted data in the project manifest failed to load. The project manifest is corrupted or the project was encrypted by another user."

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Auto Update Stats Causing Blocking

Mar 10, 2003

Recently a production server suffered a critical blocking period and I wanted to know if I could solicit some input. It seems that a stored procedure was in the middle of recompiling while and auto update statistics started. This caused blocking for like an hour on the
single object (stored procedure) that was originally called. The table that the update occurred on and that the
stored procedure is reading form is quite large. It is 2 mil rows and about 140 columns wide. Some info from
sysprocesses is below. The table alone takes up almost 4GB of space, when looking at sp_spaceused. I have some
questions.
1. Can the update statistics for a '_WA%' stats cause
blocking on a table?
2. Does an update stats on an index survive a restart of
SQL server? We tried restarting, but the blocking did not
end.
3. If the stored procedure is running under a compile, can
the server automatically start an update stats and cause
the stored procedure to wait?
4. Can the server automatically start an update stats on
more than one column stats at a time, causing one to be
blocked by the other?
5. We had never seen this issue before going to SQL2K
clustering. Is this something specific to SQL2K and not
SQL7 ?

Thanks for your input.
John Lee

This is the lock info for the blocking processes.

spid dbid ObjId IndId Type Resource Mode Status name
------ ------ ----------- ------ ---- ---------------- -------- ------ -------------------------
142 7 2 1 KEY (6f00035ef42b) S GRANT sysindexes
142 7 2 1 KEY (6f00035ef42b) S GRANT sysindexes
142 7 421576540 0 TAB Sch-S GRANT tJob
142 7 1141579105 0 TAB Sch-S GRANT tPatient_info
142 7 1141579105 0 TAB [UPD-STATS] Sch-M GRANT tPatient_info
142 7 1659921035 0 TAB [COMPILE] X GRANT iDBGetPatInfoRecord
142 7 1659921035 0 TAB Sch-S GRANT iDBGetPatInfoRecord

These are the processes that are being blocked:

spid
------
137
140

Below this is a snapshot of all the SQL processes on the server being blocked.
Save the report and send to the whole database group.

spid kpid blocked waittype waittime lastwaittype waitresource
------ ------ ------- -------- ----------- -------------------------------- -----------------------------
140 4292 142 0x0005 68609 LCK_M_X TAB: 7:1659921035 [[COMPILE]]
137 2576 140 0x0005 64671 LCK_M_X TAB: 7:1659921035 [[COMPILE]]

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Dbcc Dbreindex/indexdefrag && Update Stats

Jul 22, 2004

Microsoft states that dbcc DBREINDEX automatically updates statistics but INDEXDEFRAG does not. If this is the case, does MS mean that only the affected statistics are updated or all statistics? Also, is it a good idea to run 'Update Statistics' after doing INDEXDEFRAG?

Clive

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SQL Tools :: Update Stats And Rebuild Indexes

Sep 28, 2015

We are planning to standardize our newly deployed sql server, As a part of it we have configured 2 maintenance plans 1) Update Statistics which runs daily and 2) Index Reorganize which runs on weekly.

Apart from above, any other things to be in place for better maintenance of the sql server.

Also, how to Index Rebuild activity for clustered indexes requires any downtime.

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SQL Server 2012 :: Bulk Load Data Conversion Error (truncation)

May 15, 2014

Is there a switch I can use to force a bulk insert and if data is truncated, I'm good with that. The truncated data, in this case, is not data I can use anyway if it is long enough to be truncated.

I need to keep the field at VARCHAR(23) and if I expand it, I won't be able to join on it after the file load completes. I'd like the data to be inserted (truncated if need be) and then I'll deal with the records that are truncated after I load the file.

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SQL Server 2012 :: How To Write Stored Procedures To Load Data Model From OLTP To DWH

Nov 24, 2014

How to write Stored Procedures to load the Data Model from OLTP to DWH ?

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SQL Server 2012 :: Get Table Stats On All Tables In All Database?

Oct 17, 2014

I have this t-sql code which will get some table stats on one database at a time, I was wondering how I would get it to loop through all databases so it will pull the stats from all tables in all databases. Here is my code:

Select object_schema_name(UStat.object_id)
+ '.' + object_name(UStat.object_id) As [Object Name]
,Case
When Sum(User_Updates + User_Seeks + User_Scans + User_Lookups) = 0 Then Null
Else Cast(Sum(User_Seeks + User_Scans + User_Lookups) As Decimal)
/ Cast(Sum(User_Updates

[code]....

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SQL 2012 :: Extended Events And Wait Stats For Specific Session

Mar 4, 2015

I wanted to demonstrate something about CXPACKET wait type. For the purpose of this demo I've created a query in AdventureWorks database that uses a parallel query plan, an extended events session that captured the wait statistics for a single session and a query that shows the extended event's data. I ran it and it worked fine. Then I dropped and recreated the event session (to clear the data), in a new window I wrote a transaction that updated the table fallowed by waitfor statement so the first query will be blocked for few seconds and ran the whole thing again. The select statement was blocked as expected (ran for 9 seconds instead on 1 second as it ran without the blocking), but the wait stats that I got were almost identical to the those that I got without blocking the query.

--Query that uses parallel query plan
With MyCTE as (
select top 50 * from Sales.SalesOrderHeader)
select top 10000 * from Sales.SalesOrderHeader, MyCTE
order by newid()

[code]....

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SQL Server Admin 2014 :: Update Stats After Rebuild And Reorganize Index

Jun 26, 2015

We face slow performance issue for like taking long time for same query execution after We apply index rebuild and reorganize index. But, after execution of query or procedure for 2 -3 times, performance will be faster. I have following questions

1 do we need to update stats after we rebuild an reorganize index.
2. is it will be slow for 1-2 times for every query and stored procedure execution after we rebuild and reorganize index?

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SQL Server 2012 :: Unable To Load Data From Flat File To Table Using Bulk Insert Statement

Apr 3, 2015

I am unable to load data from flat file to sql table using bulk insert sql statement

My code:-

DECLARE @filePath VARCHAR(200)
DECLARE @sql VARCHAR(8000)
Declare @filename varchar(100)
set @filename='CCNVZ_150401054418'
SET @filePath = 'I:IncomingFiles'+@FileName+'.txt'

[Code] .....

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DB Engine :: Re-indexing And Update Stats Of Mixed Compatibility Databases In Server 2008r2

Jun 15, 2015

We have recently migrated quite a databases around 20 from SQL 2000 and 2005 to SQL server 2008R2.

I am using Ola's script for index maintenance for those with compatibility level above 80 as i heard it supports that way.

Hence separated in 2 way job where for those with compatibility level 80, we are running job with below query on each database with 80 as compared

USE ABC
GO
EXEC sp_MSforeachtable @command1="print '?' DBCC DBREINDEX ('?', ' ', 80)"
GO
EXEC sp_updatestats
GO

I am not sure if this is the only way in for those databases, because we are seeing the database getting because of that somewhere using above query.( seems log file filling very rapidly).

But above is not the case with those databases , with compatibility 90 and above.

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SQL Server 2012 :: Update Statement Will Not Update Data Beyond 7 Million Plus Rows Out Of 38 Millions Rows

Dec 12, 2014

I run the following statement and it will not update beyond 7 million plus rows and I have about 38 million to complete. I keep checking updated row counts and after 1/2 day it's still the same so I know something is wrong because it was rolling through no problem when I initiated it. I need to complete ASAP so it's adding to my frustration. The 'Acct_Num_CH' field is an encrypted field (fyi).

SET rowcount 10000
UPDATE [dbo].[CC_Info_T]
SET [Acct_Num_CH] = 'ayIWt6C8sgimC6t61EJ9d8BB3+bfIZ8v'
WHERE [Acct_Num_CH] IS NOT NULL
WHILE @@ROWCOUNT > 0
BEGIN
SET rowcount 10000
UPDATE [dbo].[CC_Info_T]
SET [Acct_Num_CH] = 'ayIWt6C8sgimC6t61EJ9d8BB3+bfIZ8v'
WHERE [Acct_Num_CH] IS NOT NULL
END
SET rowcount 0

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Not Able To Load The Application In Case Web Farm Garden When We Load Data Through Background Thread.

Dec 14, 2007

Hi,

Here I will describe my problem.
1. We are loading large amount of data from database on background thread which is starting on Application_start event in global.aspx.cs file.The data is later cached for subsquent request to improve the performance.
2. Now when we put the application on web farm garden, it is not able to load the application.
3. We are sending the request the servers through Router kind of application.
4 This application is working fine on single server enviornment.

Please help us.

Ajay Kumar Dwivedi

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Load All Data Without Knowing Old One Was Load In The Previous Time???

Apr 27, 2007

I just have done the SSIS example in the tutorial document included when install SQL 2005 ENT. I have a problem that whenever I test to run, the service load all data from source with out noticing about the data (I mean it load all the data to the destination), I do it several time and it continue to load all without checking. That mean the data is dublicated when the schedule run???

I think there should be a paramete or something like that to help the engine just load the new data to the destination. Could you help please?

Thank

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SQL 2012 :: Possible To Allow A User To Insert And Update Data In A Table

Aug 14, 2015

Is it possible to allow a user to insert and update data in a table but prevent them from performing deletes against that same table? For auditing purposes I need to prevent the end users from being able to delete data.

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SQL 2012 :: Incremental Load Of CDC Using Query

Jun 6, 2014

I required query for Incremental Load of CDC using Query

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SQL 2012 :: Load Log File To Secondary DB

Mar 11, 2015

I am after T-SQL code which will simply load the next T-log backup file from a network share folder to a warm standby db on a secondary server.What is needed is a Third server (server x), to participate in log shipping (MULTIPLE TARGETS).

Primary SERVER (SERVER A)
Secondary SERVER (SERVER B) Log shipped to via GUI.
THIRD SERVER (SERVER X) which will contain the same log shipped db from server A.

This will simply restore the logs from a network share to keep the db up to date.

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SQL 2012 :: Does Not Load Smaller Splash Screen

May 29, 2014

However when I start SQL 2012 it loads the Management Studio but does not load the smaller splash screen that usally appears asking me to connect to a server. When I try to click any of the menu items at the top of the screen the system just hangs.

I also have 2012 Service pack 1 installed too.My installations of 2005 and 2008r2 still work fine.I also tried loading SQL2014 and had the same issues as with 2012.