DB Engine :: Histogram Of Wait Events
Oct 5, 2015
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.
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Mar 4, 2015
I wanted to demonstrate something about CXPACKET wait type. For the purpose of this demo I've created a query in AdventureWorks database that uses a parallel query plan, an extended events session that captured the wait statistics for a single session and a query that shows the extended event's data. I ran it and it worked fine. Then I dropped and recreated the event session (to clear the data), in a new window I wrote a transaction that updated the table fallowed by waitfor statement so the first query will be blocked for few seconds and ran the whole thing again. The select statement was blocked as expected (ran for 9 seconds instead on 1 second as it ran without the blocking), but the wait stats that I got were almost identical to the those that I got without blocking the query.
--Query that uses parallel query plan
With MyCTE as (
select top 50 * from Sales.SalesOrderHeader)
select top 10000 * from Sales.SalesOrderHeader, MyCTE
order by newid()
[code]....
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Aug 4, 2015
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.
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Oct 24, 2015
We know we can use the event lock_deadlock and xml_deadlock_report to capture the deadlock info, however I also want to capture the execution plans for all of the SPIDs in the deadlock graph, how to output the execution plans to the extended events trace results either ? such as if there is an action for execution plan or workaround for it ?If there is no built in action for execution plan , may I know if we can add the customized info to the extended events results file also ? Such as when the deadlock related event happens , then we can run a query to get some info ,then added the info along with other info such as sql_text, dbname etc  to the events trace results file either ? The reason is if we also know the execution plans when the deadlock happens, it is useful to turning the query based on the execution plans to reduce deadlock happening .
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Jun 20, 2007
Hello experts. I have been searching for anything about this but found very little. What are the events logged in SQL Server Error Logs aside from Successful/Failed Login, Backup/Restore/Recover database and, start/init sql server? Can we configure this to log other events, like CREATE or DBCC events for example? If so, how? Thanks a lot.
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Mar 20, 2008
Hi all -
I would like to know how in sql I can generate a histogram of data with a known range of values. Here is an example of what I would like to be able to generate.
I would like to see the count of how many values range from .0001 to .0002 and .0002 to .0003 and .0003 to .0004
up to .0019
Then I would like to see greater variation such as stepping every .005 instead of .0001 after .0019. So this would be .005 to .010, .010 to .015
VALUE
0.0001
0.0002
0.0001
0.0001
0.0001
0.0001
0.0006
0.0008
0.001
0.0012
0.0014
0.0016
0.0018
0.0017
0.0007
0.0019
0.002
0.005
0.006
INTERVAL FREQUENCY
------------------------- -------------------------
0 2762
0.0001 370
0.0002 338
0.0003 246
0.0004 175
0.0005 86
0.0006 41
0.0007 24
0.0008 12
0.0009 13
0.001 9
0.0011 10
0.0012 7
0.0013 5
0.0014 5
0.0015 4
0.0016 2
0.0017 1
0.0018 1
0.0019 2
0.005 26
0.01 8
0.015 5
0.02 3
0.025 0
0.03 1
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Jan 28, 2006
I have a start date, end date for each event.
I want to list all events between the start and end date comes in Saturday or Sunday.
in SQL server 2005 TSQL statement.
any insights ?
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Feb 3, 2014
I am using this code for LongRunning Queries.
CREATE EVENT SESSION LongRunningQuery
ON SERVER
ADD EVENT sqlserver.sql_statement_completed
(
ACTION (sqlserver.sql_text, sqlserver.tsql_stack)
WHERE sqlserver.sql_statement_completed.duration > 60000
[Code] ...
Here Instead of writing to XML file how can send an EMAIL if a query runs more than 1 minute in my server ?
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May 8, 2008
I have a following code to "draw" a "histogram" :-)
use tempdb
go
declare @temp table
(id int identity(1,1)
,valuess int)
insert into @temp (valuess) values (64)
insert into @temp (valuess) values (12)
insert into @temp (valuess) values (23)
insert into @temp (valuess) values (45)
insert into @temp (valuess) values (30)
select
id
,valuess
,histogram = cast(replicate('*', valuess*0.4) as nvarchar(50))
,length = len(cast(replicate('*', valuess*0.4) as nvarchar(50)))
from @temp
order by valuess desc
Is there any better way to do it; maybe even a function?
Thanks :)
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Jul 23, 2005
I have a table, TableA with amongst other fields, a field for Qty.Qty can range from 0 to 100.How do I count the number of rows with a qty between 1 and 10, 11 and20, 21 and 30, and so on using one SQL statement? Regards,Ciarán
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Mar 20, 2004
I would like to AUTOMATICALLY count the event for the month BEFORE today
and
count the events remaining in the month (including those for today).
I can count the events remaining in the month manually with this query (today being March 20):
SELECT Count(EventID) AS [Left for Month],
FROM RECalendar
WHERE
(EventTimeBegin >= DATEADD(DAY, 1, (CONVERT(char(10), GETDATE(), 101)))
AND EventTimeBegin < DATEADD(DAY, 12, (CONVERT(char(10), GETDATE(), 101))))
Could anyone provide me with the correct syntax to count the events for the current month before today
and
to count the events remaining in the month, including today.
Thank you for your assistance in advance.
Joel
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Aug 1, 2000
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.
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Jan 15, 2008
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
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Jun 11, 2007
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.
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Dec 11, 2007
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.
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Sep 30, 2004
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?
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Jan 14, 2005
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?
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Sep 29, 2006
Hello, my first post??
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Aug 31, 2006
I'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
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Jan 6, 2008
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
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Jul 20, 2005
Oracle has a 'wait interface' for monitoring bottlenecks, etc... does SQLServer have utilities like this?
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Feb 1, 2007
Hi,
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
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Mar 7, 2008
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
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May 16, 2008
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!
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Dec 14, 2007
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.
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Jul 5, 2007
are there any tasks in SSIS that watches a folder and waits for incoming files?
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Jun 8, 2006
I 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.
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Apr 11, 2007
Good 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
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Feb 9, 2001
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,
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Oct 3, 2014
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.
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Jul 24, 2007
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
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Dec 13, 2006
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]
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May 13, 2008
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?
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