Query Plans && Statistics
Jan 23, 2004
Gurus,
I'm trying to get an application finished that works like Query Analizer in
terms of returning query plans and statistics.
Problem the co-author is having:
>In using ADO to connect to SQL Server, I'm trying to retrieve multiple
>datasets AND statistics that are usually returned via the OnInfoMessage
>event. For those that are familiar with SQL Server, I need the results
>returned by the SET STATISTICS IO ON and SET STATISTICS PROFILE ON options.
>Anyone had any luck doing this before?
Can anyone shed any light on this please?
Thanks.
BTW if anyone wants to take a look at the tool so far - to see what I'm
delving into:
http://81.130.213.94/myforum/forum_posts.asp?TID=78&PN=1
Much Appreciated!!
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Jan 13, 2004
In using ADO to connect to SQL Server, I'm trying to retrieve multiple datasets AND statistics that are usually returned via the OnInfoMessage event. For those that are familiar with SQL Server, I need the results returned by the SET STATISTICS IO ON and SET STATISTICS PROFILE ON options. Anyone had any luck doing this before?
Thanks in advance.
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Apr 13, 2006
I have 2 SQL databases which are the same and are giving me differentquery plans.select s.* from hlresults hinner join specimens s on s.specimen_tk = h.specimen_tkwhere s.site_tk = 9 and s.location in ('ABC','WIAD')and s.date_collected between '2/1/2003' and '2/3/2006'order by s.location, s.date_collectedBoth boxes have the same configuration, the only difference is that oneof them is a cluster.The Acluster box is taking twice as long to run the query.I have run statistics on both, and the cluster is still creating abitmap and running some parallelism which the other box is not.Also, the the first step, the A1 box estimates the rows returned to bearound 80K and the actual rows returned is about 40K - subtree cost =248. The Acluster box estimates 400K - subtree cost=533!After running statistics, how can it be so off?I've also reindexed to no avail . . .any insight would be very much appreciated. We just moved to this newsystem and I hate that the db is now slower -A1:affinity mask -2147483648 2147483647 0 0allow updates 0 1 0 0awe enabled 0 1 1 1c2 audit mode 0 1 0 0cost threshold for parallelism 0 32767 0 0Cross DB Ownership Chaining 0 1 0 0cursor threshold -1 2147483647 -1 -1default full-text language 0 2147483647 1033 1033default language 0 9999 0 0fill factor (%) 0 100 90 90index create memory (KB) 704 2147483647 0 0lightweight pooling 0 1 0 0locks 5000 2147483647 0 0max degree of parallelism 0 32 4 4max server memory (MB) 4 2147483647 14336 14336max text repl size (B) 0 2147483647 65536 65536max worker threads 32 32767 255 255media retention 0 365 0 0min memory per query (KB) 512 2147483647 1024 1024min server memory (MB) 0 2147483647 4096 4096nested triggers 0 1 0 0network packet size (B) 512 32767 4096 4096open objects 0 2147483647 0 0priority boost 0 1 0 0query governor cost limit 0 2147483647 0 0query wait (s) -1 2147483647 -1 -1recovery interval (min) 0 32767 0 0remote access 0 1 1 1remote login timeout (s) 0 2147483647 0 0remote proc trans 0 1 0 0remote query timeout (s) 0 2147483647 0 0scan for startup procs 0 1 1 1set working set size 0 1 0 0show advanced options 0 1 1 1two digit year cutoff 1753 9999 2049 2049user connections 0 32767 0 0user options 0 32767 0 0Acluster:affinity mask -2147483648 2147483647 0 0allow updates 0 1 0 0awe enabled 0 1 1 1c2 audit mode 0 1 0 0cost threshold for parallelism 0 32767 0 0Cross DB Ownership Chaining 0 1 0 0cursor threshold -1 2147483647 -1 -1default full-text language 0 2147483647 1033 1033default language 0 9999 0 0fill factor (%) 0 100 90 90index create memory (KB) 704 2147483647 0 0lightweight pooling 0 1 0 0locks 5000 2147483647 0 0max degree of parallelism 0 32 4 4max server memory (MB) 4 2147483647 14336 14336max text repl size (B) 0 2147483647 65536 65536max worker threads 32 32767 255 255media retention 0 365 0 0min memory per query (KB) 512 2147483647 1024 1024min server memory (MB) 0 2147483647 4095 4095nested triggers 0 1 0 0network packet size (B) 512 32767 4096 4096open objects 0 2147483647 0 0priority boost 0 1 0 0query governor cost limit 0 2147483647 0 0query wait (s) -1 2147483647 -1 -1recovery interval (min) 0 32767 0 0remote access 0 1 1 1remote login timeout (s) 0 2147483647 0 0remote proc trans 0 1 0 0remote query timeout (s) 0 2147483647 0 0scan for startup procs 0 1 1 1set working set size 0 1 0 0show advanced options 0 1 1 1two digit year cutoff 1753 9999 2049 2049user connections 0 32767 0 0user options 0 32767 0 0
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Jul 16, 2007
Hi,We are trying to solve a real puzzle. We have a stored procedure thatexhibits *drastically* different execution times depending on how itsexecuted.When run from QA, it can take as little as 3 seconds. When it iscalled from an Excel vba application, it can take up to 180 seconds.Although, at other times, it can take as little as 20 seconds fromExcel.Here's a little background. The 180 second response time *usually*occurs after a data load into a table that is referenced by the storedprocedure.A check of DBCC show_statistics shows that the statistics DO getupdated after a large amount of data is loaded into the table.*** So, my first question is, does the updated statistics force arecompile of the stored procedure?Next, we checked syscacheobjects to see what was going on with theexecution plan for this stored procedure. What I expected to see wasONE execution plan for the stored procedure.This is not the case at all. What is happening is that TWO separateCOMPILED PLANs are being created, depending on whether the sp is runfrom QA or from Excel.In addition, there are several EXECUTABLE PLANs that correspond to thetwo COMPILED PLANs. Depending on *where* the sp is run, the usecountincreases for the various EXECUTABLE PLANS.To me, this does not make any sense! Why are there *multiple* compileand executable plans for the SAME sp?One theory we have is, that we need to call the sp with the dboqualifier, ie) EXEC dbo.spHas anyone seen this? I just want to get to the bottom of this andfind out why sometimes the query takes 180 seconds and other timesonly takes 3 seconds!!Please help.Thanks much
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Jan 17, 2008
We know that a query execution plan exists for Stored Procedures in the Procedure Cache.
What about Views? Does a view have a query execution plan? We know that a View is a virtual table and that virtual table is populated
when the view is induced but does it have a Query Execution Plan?
I have tried to find this info for Views in BOL but I cannot see it anywher in BOL.
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Jul 23, 2005
I have a stored procedure that suddenly started performing horribly.The query plan didn't look right to me, so I copy/pasted the code andran it (it's a single SELECT statement). That ran pretty well and useda query plan that made sense. Now, I know what you're all thinking...stored procedures have to optimize for variable parameters, etc.Here's what I've tried to fix the issue:1. Recompiled the stored procedure2. Created a new, but identical stored procedure3. Created the stored procedure with the RECOMPILE option4. Created the stored procedure with a hard-coded value instead ofaparameter5. Changed the stored procedure to use dynamic SQLIn every case, performance did not improve and the query plan remainedthe same (I could not easily confirm this with the dynamic SQLversion, but performance was still horrible).I am currently running UPDATE STATISTICS on all of the involvedtables, but that will take awhile.Any ideas?Thanks!-Tom.
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Apr 29, 2014
Any way to invalidate cached query plans? I would rather target a specific query instead of invalidating all of them. Also any sql server setting that will cause cached query plans to invalidate even though only one character in the queries has changed?
exec sp_executesql N'select
cast(5 as int) as DisplaySequence,
mt.Description + '' '' + ct.Description as Source,
c.FirstName + '' '' + c.LastName as Name,
cus.CustomerNumber Code,
c.companyname as "Company Name",
a.Address1,
a.Address2,
[code]....
In this query we have seen (on some databases) simply changing ‘@CustomerId int',@CustomerId=1065’ too ‘@customerId int',@customerId=1065’ fixed the a speed problem….just changed the case on the Customer bind parameter. On other servers this has no effect.the server is using an old cached query plan, but don’t know for sure.
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Jul 20, 2005
Hello group.I have an issue, which has bothered me for a while now:I'm wondering why the column statistics, which SQL Server wants me tocreate, if I turn off auto-created statistics, are so important to theoptimizer?Example: from Northwind (with auto create stats off), I do the following:SELECT * FROM Customers WHERE Country = 'Sweden'My query plan show a clustered index scan, which is expected - no indexexists for Country. BUT, the query plan also shows, that the optimizer ismissing a statistic on Country, which tells me, that the optimizer wouldbenefit from knowing this.I cannot see why? (and I've been trying for a while now).If I create the missing statistics, nothing happens in the query plan (andwhy should it?). I could understand it, if the optimizer suggested an indexon Country - this would make sense, but if creating the missing index, queryanalyzer creates the statistics with an empty index, which seems to me to beless than usable.I've been thinking long and hard about this, but haven't been able to reacha conclusion :) It has some relevance to my work, because allowing theoptimizer to create missing statistics limits my options for designingindexes (e.g. covering) for some rather wide tables, so I'm thinking why notturn it off altogether. But I would like to know the consequences - hopesomebody has already delved into this, and knows a good explanation.RgdsJesper
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Aug 1, 2006
What is the unit of the numbers you get in the Time Statistics-part when running a query in Microsoft SQL Server Management Studio with Client Statistics turned on?
Currently I get mostly 0´s, but if I try and *** up a query on purpose I can get
it up to around 30... Is it milliseconds or som made up number based on clockcycles or... ?
I would also like to know if it´s possible to change the precision.
- Nikolaj
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Dec 4, 2007
I'm creating a site for a national league and am having difficulty querying for a particular type of statistic that I'm hoping an expert on here can help me with
My data structure is such that an Event is a league meeting (all games take place on the same day) which has Fixtures. These Fixtures have Fixture_Events (essentially someone scoring a goal, a timeout being called, a penalty being awarded). I also have a Teams table, a Players table, a TeamRoster table (all players registered to a team) and a FixtureAttendees table (players from team who played in game). I'm trying to return 2 statistics.
The first is "How many Shutouts has a goalie had?"
The rule for this in English, how many games has a player participated in, where they have played in goals, and the score has been x-0 in their favour.
The second is "How many game winning goals has a player scored?"
The rule for this is essentially, how many goals has a player scored where the game was previously tied (e.g. 2-2) and they have scored the last goal in the fixture (e.g. 3-2).
My tables
Code BlockCREATE TABLE [dbo].[Fixture_Events](
[FixtureEventID] [int] IDENTITY(1,1) NOT NULL,
[FixtureID] [int] NOT NULL,
[EventType] [nvarchar](50) NOT NULL,
[EventTime] [nchar](5) NOT NULL,
[TeamID] [int] NOT NULL,
[Player1] [int] NOT NULL,
[Player2] [int] NULL,
[EventCode] [nvarchar](50) NULL,
[PenaltyMinutes] [int] NULL,
CONSTRAINT [PK_Fixture_Events] PRIMARY KEY CLUSTERED
(
[FixtureEventID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
Code BlockCREATE TABLE [dbo].[Events_Fixtures](
[FixtureID] [int] IDENTITY(1,1) NOT NULL,
[EventID] [int] NOT NULL,
[LocationID] [int] NOT NULL,
[FixtureDate] [smalldatetime] NOT NULL,
[HomeTeam] [int] NOT NULL,
[AwayTeam] [int] NOT NULL,
CONSTRAINT [PK_Seasons_Fixtures] PRIMARY KEY CLUSTERED
(
[FixtureID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
Code BlockCREATE TABLE [dbo].[Fixture_Attendees](
[FixtureID] [int] NOT NULL,
[PlayerID] [int] NOT NULL,
[Goalkeeper] [bit] NOT NULL CONSTRAINT [DF_Fixture_Attendees_Goalkeeper] DEFAULT ((0)),
CONSTRAINT [PK_Fixture_Attendees] PRIMARY KEY CLUSTERED
(
[FixtureID] ASC,
[PlayerID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
Code BlockCREATE TABLE [dbo].[Fixture_Attendees](
[FixtureID] [int] NOT NULL,
[PlayerID] [int] NOT NULL,
[Goalkeeper] [bit] NOT NULL CONSTRAINT [DF_Fixture_Attendees_Goalkeeper] DEFAULT ((0)),
CONSTRAINT [PK_Fixture_Attendees] PRIMARY KEY CLUSTERED
(
[FixtureID] ASC,
[PlayerID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
It's a complicated database as I'm tried to model it as accurately as I can. It may actually be easier if I made a backup of the database available rather than trying to post code.
If anybody can help me and required further info, please let me know.
Thanks in advance.
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Feb 21, 2013
I think not. Microsoft says it is possible: one for parallel and one for serial execution. Don't believe that's possible for a stored procedure to change execution plans on the fly. Have an on-going problem with timeout occurring with an application and narrowed the culprit to a stored procedure. I couldn't find any obvious issues database wise, no locks, etc. so I recompiled (altered) the sproc without making any changes and the issue cleared for a couple days.
It happened again to day, and so I recompiled (altered) the sproc and it went away again. No code changes to both application (so they say) and stored procedure. I ran the below code snippet to check for sprocs with multiple cached plans and the offending one came up on a short list. So, my question is, Is it one sproc per query plan or can there be more than one. I understand the connection issues.
Code:
SELECT db_name(st.dbid) DBName,
object_schema_name(st.objectid, dbid) SchemaName,
object_name(st.objectid, dbid) StoredProcedure,
MAX(cp.usecounts) Execution_count,
st.text [Plan_Text]
INTO #TMP
[Code] .....
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Apr 30, 2014
way to invalidate cached query plans? I would rather target a specific query instead of invalidating all of them.
Also do you know of any sql server setting that will cause cached query plans to invalidate even though only one character in the queries has changed?
exec sp_executesql N'select
cast(5 as int) as DisplaySequence,
mt.Description + '' '' + ct.Description as Source,
[Code].....
In this query we have seen (on some databases) simply changing ‘@CustomerId int',@CustomerId=1065’ too ‘@customerId int',@customerId=1065’ fixed the a speed problem….just changed the case on the Customer bind parameter. On other servers this has no effect. I’m thinking the server is using an old cached query plan, but don’t know for sure.
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Jun 5, 2014
I'm designing a new database which will be the back-end to a heavily-used web-based application (all these terms are relative - I guess the use won't be that heavy in the grand scheme of things, I'm only talking 100 users or so at the very most). Data from the old application database will be migrated to this one, and the old database is around 7GB in size after 5 years of use.
I have two different ways of linking some tables in mind, one which is slightly more complex than the other but which potentially has benefits over the simpler method. However, I'm concerned that I might be 'over-cooking' the design, and that performance would suffer as a result, so I've tried creating the two different versions of the database (the part of it I'm concerned with, anyway), one for each of the solutions I've got in mind, migrated the data into the relevant tables and carried out some queries on the data to collect some statistics.
The problem is that, whilst I can see that the more complex method is more expensive, as expected, I don't really understand if the difference is significant. Since I don't know what the numbers in the Client Statistics window actually mean (there are no units! I'm guessing times are in milliseconds?), or how much of real-world impact the difference will have, I'm finding it hard to interpret my statistics and come to a decision.
Querying the entirety of my tables to return ~20,000 records listing one column from each of the main tables I'm playing with, the simpler method had a Total Execution Time of 199, and the more complex a Total Execution Time of 272. Is that the statistic I should be most concerned with? Is that a difference I should be concerned about? Is the difference likely to be magnified when the database is much larger and in use, such that a difference of 73 milliseconds in this test scenario could end up being as much as a whole second in production, for example?
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Jul 31, 2006
Hi
My understanding is that whenever any INSERT, DELETE, or UPDATE statements execute that impacts significant amount of rows in a table, its statistics must be automatically updated by SQL Server. But it was surprise to see in the profiler that after INSERT no update statistics event happen. But the moment a SELECT is executed on the table the event 'Auto Stats' is shown up. What is the reason behind this? Why the Auto Stats not happening immediately after the INSERT statement?
Following code can be used to illustrate this (in the profiler select the Auto Stats event under Performance):
IF(SELECT OBJECT_ID('t1')) IS NOT NULL
DROP TABLE t1
GO
CREATE TABLE t1(c1 INT, c2 INT IDENTITY)
INSERT INTO t1 (c1) VALUES(1)
INSERT INTO t1 (c1) VALUES(2)
INSERT INTO t1 (c1) VALUES(3)
CREATE NONCLUSTERED INDEX i1 ON t1(c1)
GO
--Now add 10,000 rows to update so that statistics are updated. Look into the profiler:
SET NOCOUNT ON
GO
DECLARE @n INT
SET @n = 1
WHILE @n <= 10000
BEGIN
INSERT INTO t1 (c1) VALUES(2)
SET @n = @n + 1
END
SET NOCOUNT OFF
GO
--Next runt he following statement. The profiler will now show 'Auto Stats' event
SELECT * FROM t1 WHERE c1 = 2
Regards
Sanjay Singh
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Jan 15, 1999
I have an index that shows distribution statistics of 98.20%, which is very poor. I set show query plan and show statis I/O on. This table has 1113675 rows of data.
*************
select orderID, custId, intertcsi from tblorders
where intertcsi = '2815'
STEP 1
The type of query is SELECT
FROM TABLE
tblorders
Nested iteration
Index : indxInterTCSI
orderID custId intertcsi
----------- ----------- ---------
1015245 1011313 2815
2556392 2556392 2815
....
Table: tblOrders scan count 1, logical reads: 104, physical reads: 58, read ahead reads: 0
***************
Then I use the same select statement to force a table scan:
select orderID, custId, intertcsi from tblorders (index=0)
where intertcsi = '2815'
STEP 1
The type of query is SELECT
FROM TABLE
tblorders
Nested iteration
Table Scan
orderID custId intertcsi
----------- ----------- ---------
60472 61084 2815
102184 102333 2815
...
Table: tblOrders scan count 1, logical reads: 110795, physical reads: 6891, read ahead reads: 103980
When the index is not provided, the logical reads and physical reads increased dramatically. Does this tell me that I should keep that index though it is a poor selection? Is that because a huge table like this make the optimizer use the index. The query without using index takes longer time to run.
Any idea or comment would be very appreciated.
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Jul 17, 2006
Try this script to see what queries are taking over a second.To get some real output, you need a long-running query. Here's one(estimated to take over an hour):PRINT GETDATE()select count_big(*)from sys.objects s1, sys.objects s2, sys.objects s3,sys.objects s4, sys.objects s5PRINT GETDATE()Output is:session_id elapsed task_alloc task_dealloc runningSqlText FullSqlTextquery_plan51 32847 0 0 select count_big(*) from sys.objects s1, sys.objects s2,sys.objects s3, sys.objects s4, sys.objects s5 SQL PlanClicking on SQL opens the full SQL batch as a .txt file, including the PRINTstatementsClicking on Plan allows you to see the .sqlplan file in MSSMS========Title: Using a VB Script to show long-running queries, complete with queryplans.Today (July 14th), I found a query running for hours on a development box.Rather than kill it, I decided to use this opportunity to develop a scriptto show long-running queries, so I could see what was going on. (ReferenceRoy Carlson's article for the idea.)This script generates a web page which shows long-running queries with thecurrently-executing SQL command, full SQL text, and .sqlplan files. The fullSQL query text and the sqlplan file are output to files in your tempdirectory. If you have SQL Management Studio installed on the localcomputer, you should be able to open the .sqlplan to see the query plan ofthe whole batch for any statement.'LongestRunningQueries.vbs'By Aaron W. West, 7/14/2006'Idea from:'http://www.sqlservercentral.com/columnists/rcarlson/scriptedserversnapshot.asp'Reference: Troubleshooting Performance Problems in SQL Server 2005'http://www.microsoft.com/technet/prodtechnol/sql/2005/tsprfprb.mspxSub Main()Const MinimumMilliseconds = 1000Dim srvnameIf WScript.Arguments.count 0 Thensrvname = WScript.Arguments(0)Elsesrvname = InputBox ( "Enter the server Name", "Server", ".", VbOk)If srvname = "" ThenMsgBox("Cancelled")Exit SubEnd IfEnd IfConst adOpenStatic = 3Const adLockOptimistic = 3Dim i' making the connection to your sql server' change yourservername to match your serverSet conn = CreateObject("ADODB.Connection")Set rs = CreateObject("ADODB.Recordset")' this is using the trusted connection if you use sql logins' add username and password, but I would then encrypt this' using Windows Script Encoderconn.Open "Provider=SQLOLEDB;Data Source=" & _srvname & ";Trusted_Connection=Yes;Initial Catalog=Master;"' The query goes heresql = "select " & vbCrLf & _" t1.session_id, " & vbCrLf & _" t2.total_elapsed_time AS elapsed, " & vbCrLf & _" -- t1.request_id, " & vbCrLf & _" t1.task_alloc, " & vbCrLf & _" t1.task_dealloc, " & vbCrLf & _" -- t2.sql_handle, " & vbCrLf & _" -- t2.statement_start_offset, " & vbCrLf & _" -- t2.statement_end_offset, " & vbCrLf & _" -- t2.plan_handle," & vbCrLf & _" substring(sql.text, statement_start_offset/2, " & vbCrLf & _" CASE WHEN statement_end_offset<1 THEN 8000 " & vbCrLf & _" ELSE (statement_end_offset-statement_start_offset)/2 " & vbCrLf & _" END) AS runningSqlText," & vbCrLf & _" sql.text as FullSqlText," & vbCrLf & _" p.query_plan " & vbCrLf & _"from (Select session_id, " & vbCrLf & _" request_id, " & vbCrLf & _" sum(internal_objects_alloc_page_count) as task_alloc, " &vbCrLf & _" sum (internal_objects_dealloc_page_count) as task_dealloc " &vbCrLf & _" from sys.dm_db_task_space_usage " & vbCrLf & _" group by session_id, request_id) as t1, " & vbCrLf & _" sys.dm_exec_requests as t2 " & vbCrLf & _"cross apply sys.dm_exec_sql_text(t2.sql_handle) AS sql " & vbCrLf & _"cross apply sys.dm_exec_query_plan(t2.plan_handle) AS p " & vbCrLf & _"where t1.session_id = t2.session_id and " & vbCrLf & _" (t1.request_id = t2.request_id) " & vbCrLf & _" AND total_elapsed_time " & MinimumMilliseconds & vbCrLf & _"order by t1.task_alloc DESC"rs.Open sql, conn, adOpenStatic, adLockOptimistic'rs.MoveFirstpg = "<html><head><title>Top consuming queries</title></head>" & vbCrLfpg = pg & "<table border=1>" & vbCrLfIf Not rs.EOF Thenpg = pg & "<tr>"For Each col In rs.Fieldspg = pg & "<th>" & col.Name & "</th>"c = c + 1Nextpg = pg & "</tr>"Elsepg = pg & "Query returned no results"End Ifcols = cdim filenamedim WshShellset WshShell = WScript.CreateObject("WScript.Shell")Set WshSysEnv = WshShell.Environment("PROCESS")temp = WshShell.ExpandEnvironmentStrings(WshSysEnv("TEMP")) & ""filename = temp & filenameDim fso, fSet fso = CreateObject("Scripting.FileSystemObject")i = 0Dim cDo Until rs.EOFi = i + 1pg = pg & "<tr>"For c = 0 to cols-3pg = pg & "<td>" & RTrim(rs(c)) & "</td>"Next'Output FullSQL and Plan Text to files, provide links to themfilename = "topplan-sql" & i & ".txt"Set f = fso.CreateTextFile(temp & filename, True, True)f.Write rs(cols-2)f.Closepg = pg & "<td><a href=""" & filename & """>SQL</a>"filename = "topplan" & i & ".sqlplan"Set f = fso.CreateTextFile(temp & filename, True, True)f.Write rs(cols-1)f.Closepg = pg & "<td><a href=""" & filename & """>Plan</a>"'We could open them immediately, eg:'WshShell.run temp & filenamers.MoveNextpg = pg & "</tr>"Looppg = pg & "</table>"filename = temp & "topplans.htm"Set f = fso.CreateTextFile(filename, True, True)f.Write pgf.CloseDim oIESET oIE = CreateObject("InternetExplorer.Application")oIE.Visible = TrueoIE.Navigate(filename)'Alternate method:'WshShell.run filename' cleaning uprs.Closeconn.CloseSet WshShell = NothingSet oIE = NothingSet f = NothingEnd SubMain
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Mar 9, 2006
I compared view query plan with query plan if I run the same statementfrom view definition and get different results. View plan is moreexpensive and runs longer. View contains 4 inner joins, statisticsupdated for all tables. Any ideas?
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Nov 16, 2001
I have two schematically identical databases on the same MS SQL 2000 server. The differences in the data are very slight. Here is my problem: the identical query has totally different execution plans on the different databases. One is (in my opinion) correct, the other causes the query to take 60 times as long. This is not an exaggeration, on the quick DB the query takes 3 seconds, on the other DB it takes 3 minutes. I have tried the following to help the optimizer pick a better execution plan on the slow db:
rebuild the indexes
dbcc indexdefrag
update statistics
I CAN put in a hint to cause the query to execute faster, but my employer now knows about the problem and he (and I) want to know WHY this is happening.
Any ideas would be greatly appreciated.
Thanks.
-Scott
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Feb 20, 2003
SQL7: I have added a Maintenance Plan to backup to 4mm dat tape the master and msdb SQL databases as well as another database relative to our application called WISE. This works fine; however, it appears to always append to the media as opposed to overwriting (preferred). Any help would be appreciated.....
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Aug 22, 2005
Hi,
I am going to set up maintenance plans on all our SQL servers (7.0 and 2000). I have found several 'tutorials' on how to do this, but no one is describing the options in detail. Can you guys/gals please help me out? We have alot of small databases and some medium (1-2GB).
Thanks//Stefan
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May 14, 2002
I am new to SQL Server 2000 & need ya all's help!!
I am trying to set up a database maintenance plan to back up databases & transactional logs. If I do a full backup once a week & a transactional backup every day...will I be safe enough to have enough backups to be able to restore to any point of time by restoring the full backup & the transactional logs upto that point?
In other words, I am asking what are the points to consider & what should be a decent backup plan? Do transactional logs take stored procedureal changes also?
Thanks for ur help,
Edward
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Feb 15, 2005
We have Veritas' Backupexec running in our Enterprise and the Veritas Install actually installs MS SQL Server MSDN on each Server in the Enterprise.
It looks like it also sets up a default Maintenance plan within each of the MSDN Instances.
I guess my question is.. Can I manage the Maintenance Plans on these MSDN Instances via the SQL Server EM GUI from my desktop?? Seems like when I look at the Maintenance plans alot of the options are greyed out or not available. What I am trying to do is modify one of the maintenance plans to have the backups deleted after one week (One of the Instances has been running a complete backup on the Backupexec Databases for a year and there are a years worth of backups on the Server) but the option to "remove files older than" is 'greyed out' ??????
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Feb 20, 2008
Eh uhhhh where did the old '-DelBkUps 7DAYS' (delete files older than 7 Days) option go?
Is this a future product enhancement?
I fee like such a dirty noob.
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Dec 1, 2007
Does anyone get any issues creating "Backup" jobs as a Maintenance Plan when specifying the backup location as a UNC path (e.g. "\backup_bladeBACKUPS")?
For some reason, if i try using the UNC path for a 1-time backup, it works, but when I am trying to put it into a scheduled job, it does not 'seem' to perform the Backup step.
Help please...
seethem
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Jul 23, 2005
HiCan you give me sone pointers to where I can get more information aboutthe various operations like index seeks,Bookmark Lookups,ClusteredIndex Scan in an execution plan.ThanksRagu
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Feb 28, 2007
Does anyone know if Sql Server 2005 Express SP2 support scheduled backups and maintenance plans?
Looking at http://msdn2.microsoft.com/en-us/library/bb283536.aspx , it appears to...
Thanks.
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Jan 25, 2008
Does any body have any good recommendations for maintenace plans?
Here are few questions I have.
When should indexes be re-indexed?
What should be done first? Reorganize indexes or rebuild indexes?
How often backups should be done and what kind?
How often should database statistics be updated?
Do database statistics need need to be updated on system databases?
How often should a database integrity check be done?
How long should history be kept for?
What is a good order for tasks should be done?
Any input would be great
Eytan
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Mar 5, 2007
I created several Maint.Plans before installing SP2. Now I need to modify them and I get the following error. I cannot even Create new ones, because of the Enumerate error. Please advice if this error is due to the same issues mentioned on this blog.
When replying please cc me at Camilo.Torres@bellsouth.com
Thanks
TITLE: Microsoft SQL Server Management Studio
------------------------------
Enumerate target servers failed for Job 'Daily Maintenance Plan 1'. (Microsoft.SqlServer.Smo)
For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&ProdVer=9.00.3042.00&EvtSrc=Microsoft.SqlServer.Management.Smo.ExceptionTemplates.FailedOperationExceptionText&EvtID=Enumerate+target+servers+Job&LinkId=20476
------------------------------
ADDITIONAL INFORMATION:
Failed to retrieve data for this request. (Microsoft.SqlServer.SmoEnum)
For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&LinkId=20476
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An exception occurred while executing a Transact-SQL statement or batch. (Microsoft.SqlServer.ConnectionInfo)
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String or binary data would be truncated. (Microsoft SQL Server, Error: 8152)
For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&ProdVer=09.00.3042&EvtSrc=MSSQLServer&EvtID=8152&LinkId=20476
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Jul 24, 2001
We have been asked by a customer who uses our software product whether they should upgrade from SQL 6.5 to SQL 7 or SQL 2000. They have one server with 250 clients accessing SQL Server.
I used to think that upgrading to SQL 7 would be cheaper in light of the complaints I've heard from administrators about the cost of going to SQL 2000's new pricing model, so I took a look at Microsoft's web site. Navigating around their web site looking for licensing info is always an adventure!
I saw only SQL 2000 (non-upgrade) pricing on their web site, so I'm assuming that buying SQL 2000 and then upgrading to SQL 7 would result in the same pricing structure whether a customer upgrades to SQL 7 or SQL 2000 (minus the discount for upgrading). I see that a processor based license ($2499 per processor standard edition) with its unlimited cals would be cheaper for a company with 250 clients, since the cost of cals for 250 clients with the standard edition server-based pricing would be prohibitive.
So if the pricing is the same, the decision to upgrade to SQL 7 or SQL 2000 would rest upon features available and when SQL 7 will be retired.
Does anyone know how long Microsoft will support SQL 7? (I'm defining support as until they stop providing the patches and hotfixes, since the product will no longer be actively supported. The information I saw on Microsoft's web site made it seem like SQL 7 will be supported for a long time yet.
Does anyone know how long Microsoft will support SQL 6.5? That will give me an idea how long our customers will have to upgrade?
What would you recommend to your customers so as to benefit them most?
Thanks!
Barbara
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Sep 18, 2000
Is there a way to find out what Trans-SQL is being executed by a Maintenance Plan. More specifically, if I select Attempt to Repair on the Check Database Integrity screen, I know it is executing DBCC CheckDB, but which repair option is it using (repair_fast, repair_allow_data_loss, repair_rebuild)?
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Jun 8, 2000
I defined a maintenance plan to do a backup, scheduled it for midnight, but no job ever ran. Is there some other step to do?
thanks!
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Feb 18, 2000
A year ago one of our SQL Server 6.5 servers was upgraded
to SQL Server 7.0 sp1. My compatibility level still shows
6.5, however. The SQLAgent has been using the 'localsystem'
account up until earlier this week. I changed the login
to be a domain account with System Administrator
permissions and removed the SA permissions from the
BuiltinAdministrator group. (My ultimate goal is to limit
the access NT Administrators have within my SQL databases.) All of my scheduled jobs run without error except the maintenance plans. (All
jobs have an owner of sa.)
The errors that I receive are permission errors-not being able
to get into tables on the MSDB database. However, if I open
Query Analyzer with the SQLAgent domain account and perform
a select on one of the tables in MSDB, it is successful. If I give
the BuiltinAdministrator account the SA permissions again
while still keeping the SQLAgent using the new domain account,
the maintenance jobs succeed.
Is this an upgrade problem since I do have other SQL 7.0 servers
that don't have this problem? How can I correct this?
Thank you!
Toni
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Sep 15, 1999
Hi, I'm new to SQL 7 (and fairly new to SQL Server), can anyone help with these basic questions on database maintenance plans generated by the wizard:
(1) Scheduling - can SQLServer handle say a REORG running at the same time as a backup against the same database? This should never happen, but what will happen if say a backup is due to start before a REORG has finished? To try & simulate this 'problem' I've run REORGs and backups at the same time & have yet to encounter errors I presume SQL locking handles this OK.
(2) Database integrity checks - (a) any comments on the wisdom of checking 'repair any minor problems'? Anyone had any problems with this? (b) While integrity checks are running do they take enforce a consistent view of the data? (I think this is probably the case as my reading of books online indicates that DBCC takes shared locks for the duration)
(3) Backups - does the 'VERIFY INTEGRITY' option have any impact on the live database? (My reading of RESTORE VERIFYONLY indicates it doesn't)
Thanks....
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