CXPACKET wait type current makes up 63% of all the wait types which is causing latency. I need to identify the specific workloads responsible for waits so I can optimise or MAXDOP them. I already know how to retreived the top IO, CPU, Memory consuming queries but how do I identify the statements and order them by wait time?
Can someone point me in the direction of a command, DMV or will the top CPU list be adequate?
Thanks
FYI. Perhaps I missed it on the Fix List, but applying SP3 to my Win2K Professional workstation w/ SQL Server 7 Desktop Edition remedied a chronic error I'd been receiving when trying to open a pre-existing DTS package which resided on other servers. For weeks, no matter what I've tried, I've been getting a message box saying "Invalid Paramter". (I didn't go as far as an uninstall / re-install, but I did about everything short of that.) After applying SP3, the DTS packages open up easily.
View 1 Replies View RelatedI am running an update that is taking far too long, and i see quite a few waittypes of "cxpacket" in Enterprise Manager. I cannot find any documentation on this in BOL, so does anyone here have any insight? i am the only user on this entire sql server, and i'm wondering if this is the result of a hardware malfunction or something equally sinister. thanks.
View 1 Replies View RelatedI have a server with 300Gb+ of disk space on a SAN, with a database 55Gb for data and 15Gb for tranx log. SQL Server 2000 w/SP3 is installed. Whenever I run any query (simple, complex, short, long, using indexes or not) the server current activity shows many instances of NETWORKIO, PAGELATCH_EX, CXPACKET and other wait types on several processes. In Profiler, 500,000+ events were recorded within a 60 second timeframe. Someone else is responsible for "infrastructure" so before I go with recommendations to fix my issues, I would like as much accurate info as possible about the cause. This is supposed to be a relatively low-activity server. My understanding is serious disk subsystem issues would cause all these wait types together. But why would this happen when running a "select x, y, z from table" where the table contains < 250000 records and x,y,z make up a covering index. Additionally, I ran a relatively simple query, two tables, inner join, with properly defined indexes and went home to let it run. I returned and it had been running for 18 hours - I finally ran out of patience and stopped it. Any ideas?
View 4 Replies View RelatedWhile MOM processes are running at some point, a process goes into deadlock and uses up all existing CPUs.
Sysprocesses shows this it opened up 4 threads and program name is Microsoft® Reliability Analysis Service.
Profiler doesn't show which command it was trying to execute, but last notable command which has started was MRAS_pcLoad EXECUTE @i_Return_Code = sp_getapplock @Resource = N'MOM.Datawarehousing.DTSPackageGenerator.exe', @LockMode = N'Exclusive', @LockOwner = N'Session', @LockTimeout =
Can you please help us, what could be the problem. It has been running fine till couple of days back.
--Prabhu
Hi!
I hope to get some help with a stored procedure that never stops executing when run from Reporting Services development environment.
The server: SQL Server 2005 SP2 x86, 2 gig ram, 2 processor cores.
The stored procedure I execute is simple, it declares and sets some variables and then a executes a select statement
with 6 joins.
If I execute the stored procedure from Management Studio the query runs and returns about 50 000 rows in ~2 seconds. No problems!
The problems arises when I execute the stored procedure from visual studio (testing my reporting services report). The query will never complete its execution!?
I checked the activity monitor and can verify I have NO processses with any information in the blocked by or blocking column.
The strange thing is I got 3 rows for process id 64, only one row (row 1) printing the executing user.
Row 1: Stutus suspenden, Wait Type CXPACKET
Row 2 and 3 are pending between runnable and suspended and wait typoe pageiolatch_ex and no wait type at all when I refresh. These are probably parallell threads executed in the query.
The strange thing here is that this process never completes and if I do a trace the last command executed is select statement. I don´t understand what the problem is, sql server bug? Parellelism problem (in this case, why?)
Any help is appreciated
Regards
Per
Why would I see high CXPACKET waits on a database instance with only one CPU? Since the server only has 1 CPU parallelism can't be used, or are I'm missing something here!?
SQL version
Microsoft SQL Server 2012 - 11.0.5058.0 (X64)
May 14 2014 18:34:29
Copyright (c) Microsoft Corporation
Standard Edition (64-bit) on Windows NT 6.3 <X64> (Build 9600: ) (Hypervisor)
max degree of parallelism is set to 0
I am running into problems while running a large procedure, and i think it may have something to do with a PAGEIOLATCH_SH wait problem.
My server, whose sole purpose is to run this one procedure, is doing plenty of disk i/o, and the CPU’s bouncing around, so I assume it’s working. But when I look at its process info, it seems to be sleeping a lot of the time on PAGEIOLATCH_SH. No other users are in the DB, so I'm quite confused. I don't find much info on this anywhere, so any insight would be very appreciated.
I'm new to SQL Sever 2005 and I'm trying to do what Informatica (Power Center - ETL) is trying does.
I have created a work flow and it is scheduled to run at every night 1:00 AM .The process is to load a flat file (CRV.data) into the database from a shared location.The flat file is transfered from a 3rd party and once the file transfer is complete it will create a indicator file (0 byte eg: CRV.DONE file) which indicates the CRV.data transfer is complete.
In my workflow I will be waiting for the CRV.DONE indicator file and once it is avaiable I will start loading the CRV.data and once the load is completed I will delete CRV.DONE file and be ready for the next day load.
Please let me know if there is any way in SQL Server 2005 to achieve it.Thanks
Hi. We are migrating a mainframe datacom database to SQL Server. One of our client-server applications already uses SQL Server. This application uses a middleware product to query and update the datacom database being migrated. We are considering using Service Broker to replace the middleware.
In many cases the client does not need a response provided the message is queued and will eventually get delivered. However, in some cases the client would like to wait for the message to be processed before proceeding. Is there an easy way to both submit and optionally wait for a response - with data - in a single stored procedure? If client does not want to continue to wait, is there a way to use a procedure to check for the returned message later?
We have not used Service Broker before and are doing for a "sanity" check before proceeding. We do not want to tightly couple the two databases at this time.
I have installed performance dashboard on 2 different servers. The first server have User Session CPU Time 71% and Wait Time =28%, The other server have Cpu Time of 20% and Wait Time of 79%. Have I understand that stands in SQL Server Waits And Queues that I have some typ of wait problem in my second server?
Then I tries to run this
Select
'%signal waits' = cast(100.0 * sum(signal_wait_time_ms) / sum (wait_time_ms) as numeric(20,2)),
'%resource waits'= cast(100.0 * sum(wait_time_ms - signal_wait_time_ms) / sum (wait_time_ms) as numeric(20,2))
From sys.dm_os_wait_stats
First Server
%signal waits %resource waits
--------------------------------------- ----------------------------
0.07 99.93
Second Server
%signal waits %resource waits
--------------------------------------- ----------------------------
0.12 99.88
Messy in my head€¦ Help please
My second server have
CLR with 50% in the historial wait. Rest in Sleep
My first server have
99% in sleep wait category.
I'm doing an update on a table with about 113m rows, the update-statement is fairly simple: update tab set col = null where col is not null.
The col column is mostly null.
Sysprocesses shows three rows for this statement: 1 CXPACKET (its a dual processor, 2000 box with sp3 installed), 2 PAGEIOLATCH_SH (waitresource is filled). My guess would be that the where-clause is executed in a seperate process blocking the update.
I changed the statement into update [...] set col = null; sysprocesses shows one row with PAGEIOLATCH_SH. Executing forever.
I checked other processes including those outside sqlserver but none are using the db, let alone accessing the table involved. Even restarted sqlserver to be sure there's no dead process blocking the update. Didn't help.
So I added a search condition to the where-clause, involving a clustered index in order to reduce the rowcount. The execution plan shows a 97% hit on the clustered index, but sysprocesses shows the three rows again...
So far the profiler didn't help me out either: there's a SP: CacheInsert on the update-statement... then nothing.
What should I do?
I have an ASP.NET web application that hangs on a single database UPDATE command for 5+ minutes. I can see this occur in SQL Profiler. This is a one row UPDATE statement on a small table (~600 rows). There are no JOINs or sub queries. There are no other users using the system. During this 5+ minutes, I can see the job in Enterprise Manager with a wait type of NETWORKIO. Since both IIS And SQL Server are running on the same system, the network shouldn't be an issue. Any ideas?
View 5 Replies View RelatedHello, my first post??
View 4 Replies View RelatedI'm writing a small vbscript to backup a db and some related files, so I used a WSShell calling OSQL to run a Sql BACKUP command, then after it's finished I XCOPY the resulting file plus some other related files. But the problem is that OSQL ends it's execution as soon as the BACKUP command is sent to SqlServer, not when the backup itself ends.
Anyone knows how to synchronize the two? How to wait, inside OSLQ, for the end of the BACKUP execution?
TIA
Luigi
I setup a SQL Agent to send me an email when the Average Latch Wait Time is greater than 300ms. Now I receive an email every 15 seconds stating that the current ALWT is 3916ms. That value never changes with the emails. However, the perfmon shows nothing at all (shows zero).
I also have a Buffer cache hit ratio of 2848.00.
These numbers are when there is NOBODY on the DB at all It is just sitting there. When I reboot the server, as soon as SQL starts it starts to send the emails again.
Server: Intel Xeon Quad Core 2.66
RAM: 4GB (with /3GB in the boot.ini)
RAID 1: OS
RAID 1: Data (DB and logs)
CPU Utilization: 0-1%
RAM Utilization: 527MB
OS: Server 2003 R2 With SP2
SQL: 2005 Standard with SP2
How can I determine if the ALWT is really 3916?
I executed 'Select * from sysprocesses where SPID>50 and waittime>0'
Which showed;
BROKER_RECEIVE_WAITFOR
waittime=110640ms
waittype=0x0075
status=suspended
program_name=DatabaseMail90 - Id<3780>
Any assistance is greatly appreciated.
Thank You
Magnum
Oracle has a 'wait interface' for monitoring bottlenecks, etc... does SQLServer have utilities like this?
View 3 Replies View RelatedHi,
I have a data-flow-task that imports data to sqlserver.
Now I want to check, if a special column of an imported record is null.
If yes, I have to wait 10 minutes and jump to the data-flow-task again. (Cjeck and wait).
How can I do this with the integration services?
Thanks
Gerd
We have a few SSIS jobs that we are currently manually kicking off after we are sure that certain AS400 jobs have run. We want to completely automate this process, so that we don't have to babysit. What is the most efficient way to do this? In the past (on SQL Server 7 no less) I've seen the 400 job setting a flag to 'Y' in a 400 file, FTPing it down to a flat file, and then the SQL job running every five minutes checking the flag. When it was 'Y', the SQL job would run. We do not have the option of using FTP here. Any suggestions would be appreciated! After the job runs, we'd like it to kick off a report as well
So, I'm fairly new to SQL, and I'm working with a SQL2k5 Database with pre-made packages and what-not. This database was setup before I started this job, and now I'm trying to improve part of the processing in SQL, and so far so good, but I can't figure a couple things out.
The main problem is when I start a SQL command to launch a DTS package from a .sql file, how can I make it wait for the package to complete or fail before moving onto the next part of the .sql script? Hope it's a simple question, I've just taught myself enough SQL to get by in a couple of weeks.
Thanks!
I am tring to fiqure out how i can run a TSQL and the have it start again 60 sec after it compleats, without me have to push the button. I just need it to loop over and over until my data is deleted. I have to do it this way so my site will still allow customers to login and I need the break so they can. Any help would be great.
View 3 Replies View Relatedare there any tasks in SSIS that watches a folder and waits for incoming files?
View 9 Replies View RelatedI have re-initialize some subscription. After generated snapshot successfully, the synchronization view showing 'The process is running and is waiting for a response from the server.' and I found the replication process is under 'async_network_io wait'. The job has run for more than 8 hrs. Any idea to improve it? Thanks in advaise.
View 3 Replies View RelatedGood morning,
I will start off with the default warning message: I am a beginner. That said, I have an SSIS process that calls an external executable to transform a data file through a homegrown C program. (This will eventually be converted, but for the moment needs to remain.) The end of the run creates a *.done file. How do I use the SSIS tasks to pause/wait, checking periodically, for the existence of this file before continuing with processing tasks? I apologize if this is easy, but I am stumped.
Thanks in advance,
Roger
Info:
SQL 2005
Microsoft SQL Server Integration Services Designer
Version 9.00.3042.00
When I run some of the quiries, in current activity, wait type would say:
PAGEIOLATCH_SH what does it means ? Is there a source I can see all
types of wait types ?
Help is much appreciated.
Thanks,
I keep getting an alert from a Third-Party Tool stating my server is reporting failed components with the following message
Components Reporting Problems:
Average Lock Wait Time(ms)(Critical)
When I look at sp_who2 or sp_lock I don't see anything blocking processes or anything else out of the ordinary.
Hello,
It seems strange to me that once the UNION ALL component waits for at least one row from each input buffer before it puts anything into the output buffer (that's the behaviour that I have observed anyway).
Why does it do that?
Thanks
-Jamie
[SSIS Team Followup]
I would like to know what a particular session is waiting on (cpu, io, memory etc).
For that I try to figure out how to use extended events. I would prefer to avoid the use files written to db-server, why I tried "histogram target".
Well my attempt does not produce usefull output,
-- check current event sessions
SELECT a.name,
CASE WHEN b.name IS NOT NULL
THEN 'Started'
ELSE 'Stopped'
END AS current_state
[Code] ....
The intention was to get a pareto chart, to see the top wait events in the session. I would also like to see amount of cpu used. Based on this tuning effort could be prioritized.
OK, I know this is out there all over and yes I did a search for this topic; however, I am confused about tables with an image data type and with moving text file group to another filegroup.
Here is what I have:
I have a table storing imaged documents and has become very large. I want to move the table to another filegroup. The table is created like this:
USE [PD51_Data]
GO
/****** Object: Table [dbo].[SCANNEDDOCUMENTS] Script Date: 05/13/2008 14:52:40 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
SET ANSI_PADDING ON
GO
CREATE TABLE [dbo].[SCANNEDDOCUMENTS](
[DocID] [int] IDENTITY(1,1) NOT NULL,
[CaseID] [int] NOT NULL,
[DocName] [varchar](50) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL,
[Doc] [image] NOT NULL,
[DocLocation] [varchar](255) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL,
[DocNotes] [text] COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
[TopicID] [int] NULL,
[ScannedDocumentsCheckSum] [varchar](128) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL,PRIMARY KEY CLUSTERED
(
[DocID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
GO
SET ANSI_PADDING OFF
GO
ALTER TABLE [dbo].[SCANNEDDOCUMENTS] WITH NOCHECK ADD CONSTRAINT [ISCANNEDDOCUMENTS2] FOREIGN KEY([TopicID])
REFERENCES [dbo].[TOPICS] ([TopicID])
GO
ALTER TABLE [dbo].[SCANNEDDOCUMENTS] CHECK CONSTRAINT [ISCANNEDDOCUMENTS2]
On a test DB, I moved the clustered and nonclustered indexes to a secondary filegroup no problem, but it still shows to be stored in the primary filegroup. I read an article about having to create a new table in the secondary in order to move the images and text file group. Has anyone come across this?
Do I need to drop the clustered index and FK to move to a secondary filegroup?
Or
Do I create a new table into the secondary filegroup and then add the Clustered index and constraints?
For one of our SQL server 2005 Ent edition 64 bit SP4 which has transnational replication set up and used for heavy reporting, i was trying to counter out the performance of slow running queries which basically runs and get suspended and most often are seeing waiting:So i tried to analyse the wait stats and come up with below stats where ASYNC_NETWORK_IO dominated for a collection of two weeks data.
View 15 Replies View RelatedHello,
I'm hoping someone can clarify what I am seeing below:
I have a SQL Server which the 2nd top wait state according to the SQL Server 2005 SP2 dashboard is "CLR_Auto_Event" and "CLR_Manual_Event". This server dosen't have CLR Integration enabled in "Surface Area Configuration", and we do not have any CLR applications. I've checked this dashboard many times and CLR never appeared before, and nothing has changed on the server interms of new databases, and we don't host any applications on the server. I ran a short profiler trace and didn't see any CLR Assembly Loads.
Is there something I'm missing....?
Here's my dilema, I want to run a stored procedure that starts another stored procedure running, but does not wait for the stored procedure to complete execution.
The stored procedure should execute immediately, and leave the other procedure to complete running in the background. Is there any way to do this?
Is there a way to execute a stored procedure and have it move on without waiting for a response from the stored procedure. I am trying to create a button on a webpage that will execute a stored procedure but the procedure takes to long to run and my page times out. Instead I would like the button to start the procedure and the webpage look at a table of data. When the table of data is empty then I will know the stored procedure is complete. Is this possible?
View 1 Replies View Related