How often should I run statistics on a database and what should I use? The create statistics function? Right now we have not run statistics against the database in over 8 months. However, we do have the database setup so that it will autocreate and auto update statistics on each table. Is this the best way to keep statistics up to date or is it better to run a function that rebuilds them on a nightly/weekly basis. Our database does have a large amount of activity against 99% of it takes place between 7am-6pm so the rest of the day/night we have open to schedule things like this. Any suggestions? I am really just trying to get a handle on the best way to keep our database running smoothly and quickly.
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
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.
In my environment, there is maintenance plan configured on one of the server and while running DBCC checkdb on a database of size around 200GB, log file usage of tempdb is increasing and causing the maintenance job to fail.
What can I do to make the maintenance job run successfully, size of the tempdb database is only 50GB and recovery model is set to simple. It cannot be increased as the mount point on which it is residing is 50GB.
I had run a stored procedure in my server that update statistics against all user defined tables in my database (MSSQL 7.0).
Since then I am getting errors in my ASP application where I am reffering to adovbs.inc.
Here is an example of errors I get.
Microsoft VBScript runtime error '800a0411'
Name redefined: 'adOpenForwardOnly'
/Essai/adovbs.inc, line 14
Below is the stored procedure I have run against the database.
Can anybody help tank you guys.
CREATE PROCEDURE update_all_stats AS /* This PROCEDURE will run UPDATE STATISTICS against ALL user-defined tables within this database. */ DECLARE @tablename varchar(30) DECLARE @tablename_header varchar(75) DECLARE tnames_cursor CURSOR FOR SELECT name FROM sysobjects WHERE type = 'U' OPEN tnames_cursor FETCH NEXT FROM tnames_cursor INTO @tablename WHILE (@@fetch_status <> -1)
BEGIN IF (@@fetch_status <> -2)
BEGIN SELECT @tablename_header = "Updating " + RTRIM(UPPER(@tablename)) PRINT @tablename_header EXEC ("UPDATE STATISTICS " + @tablename ) END FETCH NEXT FROM tnames_cursor INTO @tablename END PRINT " " PRINT " " SELECT @tablename_header = "************* NO MORE TABLES" + " *************" PRINT @tablename_header PRINT " " PRINT "Statistics have been updated FOR ALL tables." DEALLOCATE tnames_cursor
Hello SQL and Crystal Reports friends,I am trying to make a report and need some help please.It is a helpdesk database. Jobs are logged, and then closed. Each ofthese events is timestamped in the database in the date fields“DateLogged” and “DateClosed”JanFebMarAprNewClosedNewClosedNewClosedNewClosed10 51362364525etc.I am trying to create a crosstab style report that will show each monthof the year along the top, and then the number of jobs logged and closedduring that month. The problem I am having is that when Crystal Groupsby the month, you have to specify a date field for the grouping. If Iselect “DateLogged”, then the crosstab will accurately show all of thejobs logged for that month, but is not correct for the jobs closedduring that month. The problem is that is counting the number of jobsthat were both logged AND closed during the grouped month.Can anyone see how such a report is possible?Furthermore, I would like to be able to calculate how many jobs wereopen at the start of the month, as well as at the end of the month.Thank you for your help.*** Sent via Developersdex http://www.developersdex.com ***Don't just participate in USENET...get rewarded for it!
I am construvcting a number of databases, some of which containsensitive data and most of which do not. I am attempting to handle thesecurity issues involved in protecting sensitive data in part byputting it in its own database. If the sensitive data is in a databasecalled d_SensitiveData, and in that database there is a table called't_A' (I know, not very informative, but this is only a triviallysimple example :-), and I have a script running in a database'NotSensitiveData' (i.e. there is a statement at the beginning of thescript "USE NotSensitiveData"), how do I referenece the primary key intable 'A'?I tried a variety of things like:ALTER TABLE t_nsXADD CONSTRAINT FK_PersonID FOREIGN KEY (p_idPerson)REFERENCES SensitiveData.t_A (p_idPerson);The above is, in fact, my latest attempt. Everything I tried hasfailed precisely at the point where I specify a table in a differentdatabase. So what is the trick to refering to a table in one databasewhen using another database?This will be used in a ASP.NET v3 application where one of the things Iwant to do is have the authentication provider be a different databasefrom the one used for the main application data.Does anyone know of an example I can download from the web that doesthe same sort of thing I want to try, with some discussion of securityissues involved (i.e. what I can do to harden the application and dataserver)?NB: I am an application developer, not a DBA nor a systemadministrator.ThanksTed
Hello all-I need to check to see if the database is running before I begin all sorts of processing and figured I would do something like this. Any better ways to do this? I want to check to see if the db is up and running and also check to make sure I can connect to it. Private Function DatabaseRunning() As Boolean 'Checks to see if the database is up and running.Dim objDataConnection As SqlConnection = New SqlConnection(ConnectionString) Try objDataConnection.Open()Catch ex As Exception Return False End Try objDataConnection.Close() Return True End Function
Currently I have a Report Model that uses a Data Source where the "Credentials are supplied by the user running the report". This works quite well. The only further requirement is that I would also like to be able to specify which database to use (at runtime), would this be possible?
Hi, I have the following error logged in SQL Server's error log whenever I run a query on a particular database :
2002-01-04 22:54:02.46 spid11 Error: 823, Severity: 24, State: 1 2002-01-04 22:54:02.46 spid11 I/O error 1117(The request could not be performed because of an I/O device error.) detected during read of BUF pointer = 0x14eac480, page ptr = 0x73c94000, pageid = (0x1:0x158c89), dbid = 8, status = 0x801, file = d:mssql7datamydb.mdf..
2002-01-05 05:54:22.01 kernel SQL Server terminating because of system shutdown. 2002-01-05 05:54:22.14 kernel LogEvent: Failed to report the current event. Operating system error = 31(A device attached to the system is not functioning.).
and get this error in the Results pane of Query analyzer : Server: Msg 823, Level 24, State 1, Line 1 I/O error 1117(The request could not be performed because of an I/O device error.) detected during read of BUF pointer = 0x14ace4c0, page ptr = 0x35df6000, pageid = (0x1:0x44b73), dbid = 14, status = 0x801, file = d:MSSQL7DATAmydb.mdf.
Connection Broken
select @@version returns, Microsoft SQL Server 7.00 - 7.00.961 (Intel X86) Oct 24 2000 18:39:12 Copyright (c) 1988-1998 Microsoft Corporation Standard Edition on Windows NT 5.0 (Build 2195: Service Pack 2)
Books Online Help on Error 823 indicates that it is a disk problem and suggests that DBCC checkdb needs to be run on the database. But, hardware diagnostics on the server do not report any disk problems and dbcc checkdb also returns no errors.
Help on the cause of error 823 would be greatly appreciated. Thank you, Praveena
I have a question on database size, specifically, what difference would I expect in the size of a db (the space actually used for data, not indexes) if I have one single data device vs. multiple data devices spanned across different physical drives. I have 2 customers that have identical database tables (all columns are integers), customer A has 27 million rows and customer B has 36 million rows. If I do an sp_spaceused on the table, customer A's data takes up 9.7 gig, whereas customer B only takes up 3.2 gig, even though it has 9 million more rows. Statistics have been updated, so I'm confident the sp_spaceused is accurate on both databases.
The only differences I can see between the 2 databases is that customer B has 5 separate data files (6 gig each) for the database which are part of the Primary filegroup. These files are all on the D: drive, which is a partition on a RAID 5 array. Customer A has a single large data file (24 gig), which is also on a RAID 5 array.
Hi guys,Hope some of you SQL database experts out there can help me, 'cos at themoment I'm going mad!I want to use ACT! 2008 which uses MSSQL on 2 Laptops, (Vista & XP) one ismy own (Vista) and the other is a company laptop. I can't synchronse using anetwork connection between the two machines because the work laptop has allmanner of hidden firewalls etc. so this is not an option. I'm really pi**edoff that ACT! 2008 can only synchronise using a network connection. When Ibought ACT! 2008 I was told synchronisation is really simple. Can't use theInternet sync as this is only available with ACT! for Workgroups.I suddenly thought of the ideal solution; as I am the only user and I onlywant to use ACT! on 2 Laptops I simply save the Database onto a Memory Stickand use that on either Laptop - very simple, convenient and actually eveneasier than having to connect the two laptops to synchronise.You guessed it - bloody problems, I can copy the Database onto the memorystick and access it from the comuter that saved it.If I try to open it from the OTHER Laptop I get an error message that I amunable to open the database and to check my network connections, SQL Serveretc!!Help, I'm going mad, there must surely be a simple solution to allow me totransfer the Database backwards and forwards quickly between the twomachines using the memory stick?Thanks in advance,Best Regards,Charles
I had application that access the database 'test'. Now i created a ETL package, in this Souce database is 'test' and destination database is 'mytest'. I have scheduled the job for every hour.
Now, i want to know that whether any locks will create on source database 'test' while ETL package is running.
I searched in the previous posting but can't find any or miss them. We have a few databases that users can run reports from, i.e. production, training & development. Is there any way, say put it in either in the header or footer, to display from which database that the report are running from? Sometimes they got confused whether the data is current or like few days old.
Any input is very much appreciated. Thanks in advance ..
hi my local host cannot open the connection to my database, whilst testing with vwd seems to be able to do this? other server side functions work (response.write("hello world")) in my iis the version of .net it says its running reads: 2.0.50727, though when i go to add / remove programmes i have 3.5 there? maybe its nothing to do with .net versions? thanks in advance for your help pete
My database was previously running on sql2000 with 2 gigs of RAM and 2 x 2.8ghz XEON processors, and was running pretty decently.
I've now upgraded to SQL2005, 8 gigs of RAM, and 1 Intel 5130 2ghz processor (supposed to be more CPU power than previously)
The problem is its now running very SLOW.
I have run a trace and I'm finding queries that used to take 50,000 reads are now taking 1.4 million reads (25x more) The system runs for a decent amount of time but then SLOWS down massively for awhile. I can't find any cause yet.
What could be causing this ? What steps can I take towards resolving this? I have ran Tara's isp_ALTER_INDEX to try and help, I'm not sure what else to do.
When I run this query against PFGDSMRISSQLQ1 in Server manager 2005:use <database>INSERT INTO dbo.<table> (<column1>, <column2>, <column3>)VALUES (12598,2900,1.00)I get this error:Msg 8624, Level 16, State 1, Line 5Internal Query Processor Error: The query processor could not produce a query plan. For more information, contact Customer Support Services.Can someone please help. Thanks!
Hi there,I am trying to create a Sql Server 2005 Express database by running Sql Scripts. I have a script that has CREATE statements for tables and procedures. What I'd like it to do is create a new database with a name and a file location I specify.I searched high and low, tried lots of options with the SqlCmd tool but I keep getting authentication or other errors.Is this even possible? If so, does someone know of a good reference? I know I can create a new database and tables from within VWD but I need to create this database based on a .sql file....Thanks in advance....Imar
Script only displays the result for 'Master' database.Â
What changes are required for script to display result for all databases on the instance?
SELECT DB_Name() AS DatabaseName, OBJECT_NAME(ind.OBJECT_ID) AS TableName, ind.name AS IndexName, indexstats.index_type_desc AS IndexType, indexstats.avg_fragmentation_in_percent FROM sys.dm_db_index_physical_stats(DB_ID(), NULL, NULL, NULL, NULL) indexstats INNER JOIN sys.indexes ind  ON ind.object_id = indexstats.object_id AND ind.index_id = indexstats.index_id WHERE indexstats.avg_fragmentation_in_percent > 30 and indexstats.page_count >1000 ORDER BY indexstats.avg_fragmentation_in_percent DESC
I am doing replication through C#.net after creating the publication in server and subscription in client. But i want to know how can we view the transactions that are happening to the both databases through the C#.net code...If anybody knows please help me....
We have 1 machine running SQL Server 2005 x64 (64 bit). The other machine is backing this SQL Server up. It is a 32-bit machine, so it requires (?) a 32-bit version of SQL Server 2005.
Would this back-up machine work correctly on a database previously managed by a 64-bit machine and vice versa.
I'm running 2000 databases in a 2005 server. Can anyone tell me if there are adverse effects in doing this? As I understand it, the 2005 performance benefits are available to databases running as 2000(Ver80) But some of the new futures may not be available.. And any documentation from Microsoft/white papapers regarding this subjects are appreciated..
We are planning to upgrage our SS 2000 databases(couple of hundreds) to SS 2005.
To minimise the potential work arounds, it is agreed to have complex databases, continue running on compatibility mode 80. What are the potential impact of having database on mode 80(apart from not being able to use new feature)on SS2005?
Fruther how we can we import SS 2000 DTSs to SS 2005 SSIS in an cluster environment?
Hi guys, i am getting data from db2 database on AS400 system in CSV files and i need to use this data and build a dataware house in sql server 2000. the date formatt coming from AS400 is YYYMMDD(eg:- 1011223 101---stands for year 11--stands for month 23-- stands for day of the month )
can anybody advice me how to encounter this problem. thanks.
