Automatic Statistics Update
Mar 30, 2006Hi. I have automatic statistic update turned on for all my databases. Is
this an overhead I can do without? Could I update them overnight when the
database is hardly in use?
Thanks
--
Chris Weston
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Automatic Update Statistics
Jan 11, 2001On a SQL 7 sp 2 server, I have a database with about about 77,000 records, with automatic update statistics on inserting 1000 records took 43 minutes. With automatic update off, it took 23 minutes to insert the same 1000 records. On the same machine, I inserted 1000 records into 2 other databases with the same database structure and automatic update statistics on. On the second database, there are about 174000 records and it took 35 minutes to insert 1000 records. On the third database, there are about 93000 records and it took 19 minutes to insert 1000 records.
Why is the time so high on the first database?
What can be done to fix the problem?
Thank you.
Update Statistics
Feb 6, 2001I am using SQL 6.5. We have tables of upto 2.5GB in size. Running update statistics againts these tables takes too long, and locks out users.
Anyone know how I can make this quicker?
Davy
Update Statistics
Dec 9, 2004Hi,
I am contemplating creating a job to execute every 5 mins which will update index statisics if they are more than say 8% out. I would like to know what thoughts people have on this? i.e. pros and cons.
I like forward to what you have to say.
I have auto stats on. Our stats are often more than 10% out. At what level do you reckon the query plan might be effected by out of data stats?
Thanks
Jamie.
Update Statistics
Dec 7, 2005Is the Update Statistics found in a Maintenance Plan performed online or offline? Will it kick users out when this is run on SQL Server 2000?
Thanks
Statistics - How To Update
Sep 6, 2006Hi,
It seems to me there are many ways to update statistics for a table. i.e. "sp_updatestats", "sp_recompile", "dbcc updateusage"
Can somebody tell me the difference between those commands and what's the best way for updating your statistics? Does reindexing update the statistics?
thx,
Wilfred van Dijk
UPDATE STATISTICS
Dec 14, 2007HI,
To update statistics for entire DB i have taken the script from under given link.But need to know the
1 : what is sample percent on update statistics
2 : will it be applicable for 2005 ?
script taken from :
http://weblogs.sqlteam.com/tarad/archive/2006/08/14/11194.aspx
kindly reply soon.
Update Statistics
Feb 26, 2008How do you schedule a weekly job to do "update statistics" thru all the databases?
View 6 Replies View RelatedUpdate Statistics
Dec 5, 2007Hi All,
I update statistics for three tables every day 2:00 AM and in the job we call
one stored procedure and, in that stored procedure only three statements are
writtern for update statistics
Like:
Exec('update statistics TBL1 with fullscan')
Exec('update statistics TBL2 with fullscan')
Exec('update statistics TBL3 with fullscan')
And this job was working fine since many months but last two days its getting fail and it gives the error messages like :
could not continue scan with NOLOCK due to data movement
So could you help me what is the solution for this
Thanks,
Aric
Update Statistics
Jul 23, 2007Hi,
I would like to know when we upgrade SQL Server 2000 database to SQL Server 2005 is it required to update the statistics even if we rebuild all the indexes or create new indexes?
Thanks,
Ritesh
UPDATE STATISTICS
Mar 12, 2008Hi,
I am planning to change our current UPDATE STATISTICS strategy, which is auto stats ON. Our database is terrabytes sizes and some tables with millions of rows with over 200 indexes in one table. Some of these indexes are not really used. Most of the tables are very small.
Droping and creating new indexes are quite often used in our environment. So static script may not help.
How can I identify most frequently used indexes in a table?
With the Microsft recommended auto stats ON, what are the best other practices I can include to improve the effeciency?
Any help would be apprecited. It would be realy great if any of you can share some scripts to generates dynamic scripts.
best regards
Priw
Update Statistics Run With Users On?
Jan 24, 2002Hello,
Can "update statistics tablename" be run while the server is in multi-user mode and users accessing the table to be updated?????
Thanks in advance...
Why Do I Have To Update The Statistics So Frequently?
Oct 10, 2000I have a query that retrieves a single record from searching on two tables.
The statement goes like this...
select sum(amount) from Table1 A union Table2 B on a.id = b.id
where date < ### and date > #### and account = ###
As people are running a particular report, this statement is executed time and
time again to pull up the numbers necesarry for the report. When the report gets slow, I can speed it up by updating the statistics. My concern is that I'm having to update the statistcs every hour; otherwise, the query becomes slow. I have noticed that users are inserting data while users are running the report on one of the tables listed above. I'm sure that's making it become more fragmented and ultimately slowing down the query.
Do you have any suggestion on how I can make the union of these two tables faster? Or is there anything I could do to speed the query besides creating clusted indexes?
Any help would be appreciated....thank you
Update Statistics Vs. Reindex
Dec 14, 1999I am maintaining a large table with millions of rows that has two non clustered indexes and data changing frequently, I need to keep the indexes fresh. Update Statistics runs much quicker than Reindex. What is the appropriate situation for each and why?
Thanks in advance.
Reindexing Vs Update Statistics
Nov 22, 2004Hi
We are upgrading from sql 7 to 2000.During the upgrade process do we have to do a reindexing of all tables or will update statistics take care of that.
Or do we have to do both?
What is the difference between reindexing and update statistics.
Thanks
Madhukar Gole
Update Statistics On All Tables
Dec 8, 2006I have recently defragged my SQL server using INDEXDEFRAG. Can somebody please tell me how to update the statistics on all the tables? Thanks in advance.
Below is the script that I executed to defrag all the tables in my database if anyone needs this.
/*Perform a 'USE <database name>' to select the database in which to run the script.*/
-- Declare variables
SET NOCOUNT ON
DECLARE @tablename VARCHAR (128)
DECLARE @execstr VARCHAR (255)
DECLARE @objectid INT
DECLARE @indexid INT
DECLARE @frag DECIMAL
DECLARE @maxfrag DECIMAL
-- Decide on the maximum fragmentation to allow
SELECT @maxfrag = 20.0
-- Declare cursor
DECLARE tables CURSOR FOR
SELECT TABLE_NAME
FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_TYPE = 'BASE TABLE'
-- Create the table
CREATE TABLE #fraglist (
ObjectName CHAR (255),
ObjectId INT,
IndexName CHAR (255),
IndexId INT,
Lvl INT,
CountPages INT,
CountRows INT,
MinRecSize INT,
MaxRecSize INT,
AvgRecSize INT,
ForRecCount INT,
Extents INT,
ExtentSwitches INT,
AvgFreeBytes INT,
AvgPageDensity INT,
ScanDensity DECIMAL,
BestCount INT,
ActualCount INT,
LogicalFrag DECIMAL,
ExtentFrag DECIMAL)
-- Open the cursor
OPEN tables
-- Loop through all the tables in the database
FETCH NEXT
FROM tables
INTO @tablename
WHILE @@FETCH_STATUS = 0
BEGIN
-- Do the showcontig of all indexes of the table
INSERT INTO #fraglist
EXEC ('DBCC SHOWCONTIG (''' + @tablename + ''')
WITH FAST, TABLERESULTS, ALL_INDEXES, NO_INFOMSGS')
FETCH NEXT
FROM tables
INTO @tablename
END
-- Close and deallocate the cursor
CLOSE tables
DEALLOCATE tables
-- Declare cursor for list of indexes to be defragged
DECLARE indexes CURSOR FOR
SELECT ObjectName, ObjectId, IndexId, LogicalFrag
FROM #fraglist
WHERE LogicalFrag >= @maxfrag
AND INDEXPROPERTY (ObjectId, IndexName, 'IndexDepth') > 0
-- Open the cursor
OPEN indexes
-- loop through the indexes
FETCH NEXT
FROM indexes
INTO @tablename, @objectid, @indexid, @frag
WHILE @@FETCH_STATUS = 0
BEGIN
PRINT 'Executing DBCC INDEXDEFRAG (0, ' + RTRIM(@tablename) + ',
' + RTRIM(@indexid) + ') - fragmentation currently '
+ RTRIM(CONVERT(varchar(15),@frag)) + '%'
SELECT @execstr = 'DBCC INDEXDEFRAG (0, ' + RTRIM(@objectid) + ',
' + RTRIM(@indexid) + ')'
EXEC (@execstr)
FETCH NEXT
FROM indexes
INTO @tablename, @objectid, @indexid, @frag
END
-- Close and deallocate the cursor
CLOSE indexes
DEALLOCATE indexes
-- Delete the temporary table
DROP TABLE #fraglist
GO
UPDATE STATISTICS Questions
May 18, 2007I am looking to run UPDATE STATISTICS for the first time, don't ask why it wasn't done prior please :(, on a set of large tables in our 346gb database whcih has been being populated with transactional data for the past 4 years. The tables contain 1.2, 35, 64, and 92 million rows. I have used the STAT_DATE function to determine that none of these tables have ever had update statistics run for them.
My question is how should I go about this process and what options should I be selecting when issuing the command? I assume that I must first run with the FULLSCAN paramater in order to initially generate statistics for the table then would assume that following this initial population I could run without any paramaters nightly against the tables in the database to keep statistics up to date. Any guideance you all could provide to a newb would be greatly appreciated.
Thanks! Scott Clark
Update Statistics On Table
Apr 15, 2008Hi Gurus,
I need you update statistics on table .
Is there any command or stored procedure for this.
Thanks,
ServerTeam
Auto Update Statistics
Apr 5, 2006Hi all,
I'm using SQL 7, there is a setting on DB properties called "Auto update statistics", what kind of statistics does this refers to and how can this stats be accessed?
Thanks for your help!
Gustavo
Thanks,
GS
Auto Update Statistics
Jun 20, 2007I have Auto Create Statistics and Auto Update Statistics ON in one of my databases.
How do I know what time the Auto Update Statistics Kicks on ?
I dont see it in the log.
Is there a way for me to find out when was the last time Auto Update Statistics kicked on?
TIA
Automatic Update
Apr 22, 2008hi,
i have:
create table tbl_order
(
id int
,price float
,quantity int
,product nvarchar(50)
,date_of_order smalldatetime
,date_of_change smalldatetime
)
insert into tbl_order (id, price, quantity, product, date_of_order) values (1, 23.21, 2, 'A+B', getdate())
insert into tbl_order (id, price, quantity, product, date_of_order) values (2, 22.21, 2, 'A+B+C', getdate())
and i want to make automatic update:
-if new order is made, i want to update field date_of_change with getdate().
i want to put it in a job with some trigger or something that will recognize instant new insert.
thank you in advance,
Automatic Update
Nov 5, 2007
I hope that a someone has answer for me.
I want create a new database in sql server and import the database tables of Dynamics CRM and of other application (Accountview) import so that I can make a link of these two databases. My question is it possible that this database update or refresh automatic and how?
The database of Dynamics CRM manages by sql server. But the database of accountview is not manages by sql server. I make a link with odbc driver for Accountview database.
Can someone help me please?
Reorganize Indexes/Update Statistics
Jun 29, 2000I am using the Maintencance Plan wizard, but it only allows me to either select the "reorganize data and indexes" option or the "update statistics" option (in the Optimizations tab). I can't select both of them. What is the reason for this?
joe
DBCC DBReindex VS Update Statistics
Feb 1, 2004Hi all,
Is it neccessay to run the "Update Statistics" after run "DBCC DBReindex"? Does "Update Statistics" automatically update the stats?
Thanks in advance
Kim,
Concern On Auto Update Statistics
Dec 7, 2007Hi all,
We are using SQL Server 2005. The auto update statistics and auto create statistics for a database is set to ON. This database has a very heavy work load. When I checked the individual statitics , still the last updated statistics is in a old date value (few months ago).
Is it necessary to manually update the statistics for the same database? Or can we rely upon "auto update statistics" itself ?
Usually in what frequency the manual UPDATE STATISTICS should be run on production system which has heavy transactions ?
Thanks & Regards,
Hariarul
Strange Issue With UPDATE STATISTICS.
Dec 10, 2007Hi all ,
We had a SQL server (2005) that was performing very bad . We thought of doing an UPDATE STATISTICS thinking that the response times would increase.
BUT , UNFORTUNATELY THE SERVER PERFORMANCE BECAME WORSE FROM BAD.
Ex : Stored procedures that took 2 minutes are running for 22 minutes now. Queris that ran for 17 seconds are running for 14 minutes now.
Anybody faced this kind of issue earlier ? Any help would be appreciated.
Thanks & Regards,
Hariarul
UPDATE STATISTICS Necessary To Improve Performance (?)
Jul 20, 2005Dear Sql Server experts:First off, I am no sql server expert :)A few months ago I put a database into a production environment.Recently, It was brought to my attention that a particular query thatexecuted quite quickly in our dev environment was painfully slow inproduction. I analyzed the the plan on the production server (itlooked good), and then tried quite a few tips that I'd gleaned fromreading newsgroups. Nothing worked. Then on a whim I performed anUPDATE STATISTICS on a few of the tables that were being queried. Thequery immediately went from executing in 61 seconds to under 1 second.I checked to make sure that statistics were being "auto updated" andthey were.Why did I need to run UPDATE STATISTICS? Will I need to again?A little more background info:The database started empty, and has grown quite rapidly in the lastfew months. One particular table grows at a rate of about 300,000records per month. I get fast query times due to a few well placedindexes.A quick question:If I add an index, do statistics get automatically updated for thisnew index immediately?Thanks in advance for any help,Felix
View 17 Replies View RelatedStrange Behaviour Of UPDATE STATISTICS.
Dec 10, 2007Hi all ,
We had a SQL server (2005) that was performing very bad . We thought of doing an UPDATE STATISTICS thinking that the response times would increase.
BUT , UNFORTUNATELY THE SERVER PERFORMANCE BECAME WORSE FROM BAD.
Ex : Stored procedures that took 2 minutes are running for 22 minutes now. Queris that ran for 17 seconds are running for 14 minutes now.
Anybody faced this kind of issue earlier ? Any help would be appreciated.
Thanks & Regards,
DBLearner
Update Statistics And Rebuild Index
Feb 26, 2008Is it neccessary to schedule a update statistics on index in sql server 2005 on daily basis
Is it neccessary to schedule a rebuild index on index in sql server 2005 on daily basis
Update Statistics - Performance Question
Oct 2, 2007
If I run sp_updatestats, does it effect performance?
My testing also reveals canceling sp_updatestats, doesn't caus a rollback?
Update Statistics, Auto_Update_Statistics - Please Clarify
Sep 27, 2006Test Qn
View 5 Replies View RelatedHow To: Scheduled Automatic Update?
Jun 6, 2007Hi I'm currently running a complex MSSQL query (using SqlDataSource server control) everytime a web page is loaded to display a single value. How ever, this data only needs to be updated every 24 hours, therefor remains the same all day. I'm trying to figure out a way where by the MSSQL query runs once a day and the value is inserted directly somehow into my aspx page, or, failing that is inserted into an MSSQL database.I also have full root access to my server.thanks
View 4 Replies View RelatedAutomatic SQL Db Update At Set Time?
Jul 28, 2004I would like to limit the number of pages a user can view on my website each day. The users logs in and I can count the number of pages viewd in a field but i want to know how i can set the page count field to reset to 0 at the end of the day (ie midnight). Is it possible to do this? and if so how? Thanks.
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