Is it possible to execute queries in parallel on multiple linked servers? I retrieve the checksum of a table on a linked servers like this:
SELECT * FROM OPENQUERY(Server1, 'SELECT CHECKSUM_AGG(BINARY_CHECKSUM(*) FROM Table1')
I need to do this on multiple linked servers at the same time - is this possible? I tried the following but my workstation executes the queries sequentially:
what the ideal CPU count and Max Degree of Parallelism are for a 3rd party database server.The server has 12 CPUs, 32GB RAM and all database sizes add up to < 30GB so they can all fit in memory (I tried to force this by doing a select * from every table). On certain payroll days, the CPU gets maxed out to 100% for a few seconds.
MAXDOP was originally set to the default 0. We later changed it to 8 based on several 'best-practices' articles. However the vendor suggests to change it to 1 (no parallelism), while others suggest changing it to 4, so that one run-away query doesn't hog most of the CPUs.
I'd like to find out how many CPUs are actually being used by queries. There is a Degree of Parallelism event in URL.... The BinaryData column says :
0x00000000, indicates a serial plan running in serial. 0x01000000, indicates a parallel plan running in serial. >= 0x02000000 indicates a parallel plan running in parallel.- What does "parallel plan running in serial" mean ?
I see a lot of 0x01000000, and a few 0x08000000's in my trace.How can i determine whether one query is hogging CPUs and if reducing it to 4 will work?
I have a ODBC data source setup for the AS400DB2 which is AS400JDE
The linked server has been created and all the tables are visible within enterprise manager.
If I had a table F0101, datasource = AS400JDE and linked server of AS400
How would I query it.
I gave tried AS400.AS400JDE.DBO.F0101, but i get the following error message. OLE DB provider 'MSDASQL' does not contain table '"as400jde"."dbo"."f0101"'.
i added a linked sql 7 production server to my sql 7 development server so i could perform some data comparisons between the two servers. after i linked in the server, i was able to see all the icons for the various tables in the production server. i went to query analyzer and executed the following openquery:
select * from openquery(itdev_s08, 'select * from dbo.tablename')
it returned all the rows in the table. however, i want to comapre several different values so i needed a better way to query. i then decided to try the distrbuted query below:
select * from linkedserver.dbname.dbo.tablename
however instead of a result set i got the error message below:
Server: Msg 7314, Level 16, State 1, Line 1 OLE DB provider 'SQLOLEDB' does not contain table '"dbname"."dbo"."tablename"'.
i went to BOL and it told me the only reason i would get this error is if the object did not exist or if i did not have permission to use it. however, i know the object exists and i have the appropriate permission becuase i can obtain a result set from the first query in the same query analyzer window. is my syntax incorrect? what am i doing wrong?
I am getting the following error when with SQL Express.SQL Server blocked access to STATEMENT 'OpenRowset/OpenDatasource' of component 'Ad Hoc Distributed Queries' because this component is turned off as part of the security configuration for this server. A system administrator can enable the use of 'Ad Hoc Distributed Queries' by using sp_configure. For more information about enabling 'Ad Hoc Distributed Queries', see "Surface Area Configuration" in SQL Server Books Online. While I was very please to see such a verbose error and directions on where to find the answer I have yet to figure out how to turn this option on... I tried sp_configure 'Ad Hoc Distributed Queries', 1 but got the following error The configuration option 'Ad Hoc Distributed Queries' does not exist, or it may be an advanced option.If I execute only sp_configure it does not list Ad Hoc Distributied Queries as an option. I checked the sql Books Online and it tells me to use the Surface configuration tool which SQL Express does not seem to have.... Could someone help me out with this?Thanks - Mark
Hi, I am trying to use linked servers (all SQLServer 6.5 and 7.0). When I issue a distributed query utilizing the four-part qualified table name for the distributed machine and using the LIKE operator, the execution plan shows that the remote query is returning ALL the rows from the remote distributed server, then performing the LIKE filter locally on my server! Needless to say, performance sux! Any ideas what I may be doing wrong or what settings I am unaware of? Example query:
select * from server.database.schema.table where column1 like 'A%'
Hi there, I am trying to link one sql server to other sql server(version 7.0). I was able to link server1 to server2 by creating an odbc source and am able to see the tablenames when i click on the linked server tables. My problem is..when i am trying to query on these tables its giving me error saying "OLE DB provider 'MSDASQL' does not contain table xxxxxx"
i am using select * from servername.tablename.dbo.tablename.
When i try to use the OPENROWSET function on a particular server i get the error:
"SQL Server blocked access to STATEMENT 'OpenRowset/OpenDatasource' of component 'Ad Hoc Distributed Queries' because this component is turned off as part of the security configuration for this server. A system administrator can enable the use of 'Ad Hoc Distributed Queries' by using sp_configure.."
Does anyone know how exacly you do configure this?
I'm deploying an OLE DB provider to be used as linked server in on customer pc. The provider works ok on both machines I used to test it, one with Vista (64-bit), the other with XP (32-bit). Both machines have SQL server express 2005 SP2 (9.0.3042) installed. Now, customer machine is again Vista (64-bit) with SQL server express 2005 SP2 (9.0.3054), and customer tested it on another Vista machine with SQL server express 2005 SP2 (9.0.3042). On both machines, following error occurs when SELECT statement is issued to the provider (though linked server creation runs smoothly):
Msg 7308, Level 16, State 1, Line 1
OLE DB provider 'XXX.XXXXX' cannot be used for distributed queries because the provider is configured to run in single-threaded apartment mode.
1) registry entry for ThreadingModel is Both 2) the provider works on my side 3) I can't seem to instantiate the provider on customer side even when I disallow provider to be inproc for SQL server, which would hint on some registration issue (maybe some leftovers on my local machines that are not present on customer side)
We are migrating a database that makes use of distributed queries. In other words, it queries data from other databases on the same server, as well as from databases on linked servers.
The use of linked servers as well as linked databases (for lack of a better term) presents a challenge since we will need to register various new linked servers in the target environment. Ideally, we would like the database to be portable such that we will not have to worry about registering linked servers regardless of where it is hosted.
Is there a way to write distributed queries so that do not rely on linked servers/databases? For example:
SELECT * FROM [ServerName].[Database].[Owner].[TableName]
If there is such a method, it would make our database much more portable in terms of server migration.
When excuting the xp_sendmail in the Query analyzer, my mail gets send. When doing this in my code it doesn't work eventhough I explicitly use startmailn then xp_sendmail and then sp_stopmail? I think this is a problem of user rights? I gave my user as parameter but even then it didn't work. Any suggestions? I'm pretty sure, the used code is correct.
I have a package that contains several package when executing it like a task, presents the following messages
Error: 2008-02-08 11:24:02.55 Code: 0xC0202009 Source: DWCampo-Dimensiones- Produccion Connection manager "Administrador de conexi¢n con Excel" Description: SSIS Error Code DTS_E_OLEDBERROR. An OLE DB error has occurred. Error code: 0x80040154. An OLE DB record is available. Source: "Microsoft OLE DB Service Components" Hresult: 0x80040154 Description: "Class not registered". End Error Error: 2008-02-08 11:24:02.55 Code: 0xC020801C Source: Agrupacion Canteros Origen - Canteros$ [1] Description: SSIS Error Code DTS_E_CANNOTACQUIRECONNECTIONFROMCONNECTIONMANAGER. The AcquireConnection method call to the connection manager "Administrador de conexi¢n con Excel" failed with error code 0xC0202009. There may be error messages posted before this with more information on why the AcquireConnection method call failed. End Error Error: 2008-02-08 11:24:02.55 Code: 0xC0047017 Source: Agrupacion Canteros DTS.Pipeline Description: component "Origen - Canteros$" (1) failed validation and returned error code 0xC020801C. End Error Error: 2008-02-08 11:24:02.55 Code: 0xC004700C Source: Agrupacion Canteros DTS.Pipeline Description: One or more component failed validation. End Error Error: 2008-02-08 11:24:02.55 Code: 0xC0024107 Source: Agrupacion Canteros Description: There were errors during task validation. End Error Error: 2008-02-08 11:24:02.55 Code: 0xC00220E4 Source: DWCAMPO-Dimensiones (Producci¢n) Description: Error 0xC0012050 while preparing to load the package. Package failed validation from the ExecutePackage task. The package cannot run. . End Error
I know that you can execute a stored proc with the "execute" command, but is there any way to execute a string that is an sql string? On a related note, is there a better way than building a string like "select * from table where" and then tacking on "value="+@somevalue to do a search if your search is based on multiple (possibly null) variables? If you can answer the first question, dont bother with the second. =P
Hi. Some time I get delay in running particular querry.I check in my App and also in sql visual stodiu.I'm using sqlexpress edition.If I use Sql developer does speed go up?
I have got an SQL server stored procedure, and I would like to get this stored procedure, dbo.SpDate_Time_Minute_Today below executed against a matching or exact datetime from the database tables, PRODUCT_SALES.
I found the following link which seems to be the problem we're experiencinghttp://support.microsoft.com/kb/937517
The link includes a workaround which is the following: "To prevent the SQLNCLI provider from sending an attention signal to the server, use the SQLNCLI provider to consume fully any rowsets that the OLE DB consumer creates. "
How do I use the SQLNCLI provider to fully consume any rowsets?
I am working on SQL Server 7.0. Every weekend we go for reindexing of some tables. I want to know if it is possible to run the re-indexing of tables in parallel so that I can save time.
Our database is of size 80GB and one table is around 22GB. Rebuilding of index on this table takes a lot of time and we are unable to index the other tables.
hi, we currently use the Database Maintenance Plan to do backups for our SQL Server 2000 databases. I notice that the database are backed up one after the other.
I would like to know how to run the backups in parallel rather than sequentially. To do this, is there any dependency on the number of CPUs?
I created the package to download 4 ftp files at once. I set the MaxConcurrentExecutables for the SSIS package to 4. So in BIDS in downloads 4 files at the same time.
However, when I started the job I noticed that only 3 files were downloaded at the time (looking at temp files in download directory)
Solution: Sure enough after digging around for awhile - in Step properties for SSIS package - there is execution tab - and "Maximum Concurrent Executables" was -1 (which for some reason defaults to 3 concurrent processes even on our dual CPU server) - so after chanign that value to 4 - tada - all 4 files in parallel
Is there any way to run a stored procedure in parallel to another one? i.e. I have a stored procedure that sends an email. I then scan a table and send any unsent emails. I do not want the second part to slow the response to the user.
Assuming I have a line, is there a function I can call to create a parallel line at a given distance away.i.e - with the below I would want to draw a parallel line to the one output.
Hi ,I need to place the results of two different queries in the same resulttable parallel to each other.So if the result of the first query is1 122 343 45and the second query is1 342 443 98the results should be displayed as1 12 342 34 443 45 98If a union is done for both the queries , we get the results in rows.How can the above be done.Thanks in advance,vivekian
Hi,All. I'm writing test cases on C# for a few methods that make changes in database.To prevent making changes I used BeginTransaction-Rollback,everything was good.But this doesn't work if tested method has BeginTransaction-Rollback code itself.An error appears in NUnit: System.InvalidOperationException : SqlConnection does not support parallel transactions. Do smb know how to solve the problem?
I have several packages within secuence containers and into one main dtsx package with a checkpoint configuration and when I run it some succeed and some don´t. The problem is that when I rerun it checkpoint doesn´t seem to work ´cause some of the successful packages are rerun as well (and not skipped as it should be...) In other words, the process does not begin on the point of failure..
Seems to be that packages that finish after the failure point (and succeed) are not registered in the checkpoint file, then when I rerun the main package these succeeded packages are rerun too....
I have another post here regarding SQL 2005 running a query 50% slower than on 2000. It was discovered that 2005 runs the query in series whereas 2000 runs it in parallel.
Even with "Cost Threshold For Parallelism" set to a default value – 0, 2005 still executes my query in series. Does anyone know how to force a query to run in parallel in SQL 2005. I specifically want to set it at the database level.
I have a SQL 7 db with a union query (view), and I'm getting the error, "Thequery processor could not start the necessary thread resources for parallelquery execution." This union query has been in place for about two years nowwith no problems until just now, though I haven't changed anything. Also, Ihave a local copy of the database on my machine, and the query runs fine.As noted, I haven't changed anything in the query, nor in the SQL settings.There is a network administrator, so it's possible that he may have changeda setting, but I don't know what. The query is reproduced below. Any ideasas to what's going on would be appreciated.NeilMain query:SELECT Tmp.INVCUST, Tmp.SDNBR, Tmp.SDBOOK, Tmp.SDIVCLN,Tmp.SDPAID, Tmp.SDPRICE, Tmp.SDCOPIES, Tmp.Location,INVTRY.AUTHILL1, Tmp.INVDATE, INVTRY.SaleSrc,INVTRY.HoldInitFROM (SELECT INVDATE, INVCUST, SDNBR, SDBOOK, SDIVCLN,SDPAID, SDPRICE, SDCOPIES, 'P' AS LocationFROM vwInvoiceDetUNION ALLSELECT INVDATE, INVCUST, SDNBR, SDBOOK, SDIVCLN,SDPAID, SDPRICE, SDCOPIES, 'N' AS LocationFROM vwInvoiceDetNUNION ALLSELECT INVDATE, INVCUST, SDNBR, SDBOOK, SDIVCLN,SDPAID, SDPRICE, SDCOPIES, 'M' AS LocationFROM vwInvoiceDetM) Tmp INNER JOINdbo.INVTRY ON Tmp.SDBOOK = dbo.INVTRY.[Index]vwInvoiceDet:SELECT tabInvoice.INVDATE, tabInvoice.INVCUST,SALEDET.SDNBR, SALEDET.SDBOOK, SALEDET.SDINVNUM,SALEDET.SDPRICE, SALEDET.SDPAID, SALEDET.SDCOPIES,SALEDET.SDIVCLN, tabInvoice.INVNBR, SALEDET.SDIDFROM dbo.tabInvoice INNER JOINdbo.SALEDET ONdbo.tabInvoice.INVNBR = dbo.SALEDET.SDNBR(vwInvoiceDetN and vwInvoiceDetM are similar to vwInvoiceDet.)
SQL Server 2000 SP3ALast week one of our processes starting issuing or suffering deadlockdetected errors every 15 minutes or so.I have read several articles at MS on the subject. I set a couple ofstartup parameters related to producing deadlock detection informationand ran SQL Profiler. I found the SQL statements being issued by thedeadlocked statements. In every deadlock the same UPDATE statementappears however the data values being searched on are different. Thebest I can tell from trying to query the actual data each update hitsonly one or very few rows. No indexed column is updated so the indexesshould not be the source of conflict.Looking at the query I noticed that the query does not have anavailable index and Query Analyzer shows that the full table scan isbeing done in parallel.My question: Does SQL Server change or modify its locking rules whenqueries are converted to be ran using parallel processing? If so, doyou have a reference?Here is the deadlock entries posted to the error log:SPID=167ResType:LockOwner Stype:'OR' Mode: IX SPID:63 ECID:0 Ec:(0x65971510)Value:0x3c577e60 Cost:(0/0)Input Buf: Language Event: UPDATE Station_Upload setStation_Accept_Status = 'ACC',HeadStatus ='ACC',LastProcessedSta='110',HeadPartType='1' WHERE Part_Serial_No ='SCH1119323' AND Station = 'H110'SPID=63ResType:LockOwner Stype:'OR' Mode: IX SPID:167 ECID:0 Ec:(0x65801510)Value:0x3c27d060 Cost:(0/0)Input Buf: Language Event: UPDATE Station_Upload setStation_Accept_Status = 'ACC',HeadStatus ='ACC',LastProcessedSta='70',HeadPartType='1' WHERE Part_Serial_No ='SCH1119060' AND Station = 'H070'I have suggested adding an index to support the query.Any ideas?Thanks -- Mark D Powell --
