Hello,
Does the performance counter Buffer cache object refer to Data cache and procedure cache or just refers to Data cache???
I was of the opinion that Buffer cache means data cache and Plan cache means procedure cache. Can someone throw some light???
Regards
Jaideep
Hi SQL lovers!
I'm trying to set up Performance Monitor to watch my SQL Servers. There should be an SQL object in the drop down list in the 'Add To Chart' dialogue box in PerfMon. But not for me! What am i missing here?
I've started the saved Performance Monitor file you get with SQL Server and i can see the 5 already added objects (buffer cache etc..) but when i go to add more, there is no SQL Server object - strange!?
Can anyone help?
Immense thanks,
Kyle Henly.
Allegedly a DBA!
Halcrow Group UK.
I am experiencing problems gathering Stats from Performance Monitor on SQL Server. I am running NT4 with SP5 applied, with SQL Server 7.00.699 . My problem is that I can use the "Performance Monitor" under the Microsoft SQL Server 7.0 sub-menu (Start Menu) to monitor the SQL Server Stats on my machine, but I am unable to monitor any of the servers in our enterprise. Performance Monitor does not even list the SQL Server Object. Does anyone have any suggestions please?
View 2 Replies View RelatedHi
I have a curious problem. I have a development environment SQL Server 6.5 sp 5a and a production environment sp 4
When I view the performance monitor in the development environment I can see the SQL Server object counter but on the production environment I can see all object except sql server objects.
What could the problem be ? Add chart on the production server shows me all ojects other that SQL Server and the same is not true for development !
Is there a way to drop clean buffers at the database level instead of the server/instance level like the undocumented €œDBCC FLUSHPROCINDB (@dbid)€??
Is there a workaround for €œdbo€? to be able to flush procedure and data cache without being elevated to €œsysadmin€? server role?
PS: I am aware of the sp_recompile option that can be used to invalidate cached execution plans.
Thx.
Help, have recently upgraded from 6.5 to 7.0 and have come across a problem with performance. The problem appears to relate to the buffer cache being flushed, the buffer cache hit ratio drops from 98% to 0% in a matter of a second. It then very slowly grows, then is flushed again, then increase slowly upto 30%.
Does any one have any ideas as to what would flush the buffer cache?
Any comments would be much appreciated - cheers
If I'm on a remote machine, meaning a computer not in the WSFC cluster, and I open SSMS 2014, point it to a SQL Instance, and open activity monitor:
1. I get all the panes and charts except % Processor Time.
2. Then, if I authenticate to the cluster's domain by mapping a drive with valid domain credentials, I'm free to put performance counters in the Perfmon - - - but SQL Activity Monitor shuts down with“The Activity Monitor is unable to execute queries against server SQL-V01INSTANCE1..Activity monitor for this instance will be placed into a paused state.Use the context menu in the overview pane to resume the activity monitor.
Additional information: Access is denied. (Exception from HRESULT: 0x80070005 (E_ACCESSDENIED))(Mscorlib)â€
3. Of course, the Activity monitor can't be resumed via the context menu. Removing counters and closing the perfmon do not work. I dropped the mapped drive and rebooted the machine. That brought back 95% of the information in the Activity monitor.
4. Further experimentation showed that any mapping of drive shares present on the SQL Server to the computer running SSMS cut off functionality of the 'overview' pane in the remote machine's SQL Activity monitor -- the monitor that had been trying to watch the server offering the shares.
Hi,
My problem is that I cannot completely clean buffer cache on SQL Server 2005 version 9.00.2047.00 (probably SP1).
Right after I run DBCC DROPCLEANBUFFERS in the context of my database (this is development server, and so far I am only the one who is working with a particular database), I run a script that quetries sys.dm_os_buffer_descriptors view also from the context of my database to make sure that the buffer cache is really clean. However it shows large number of entries totalling 42 MB.
I ran both DBCC an the script in the past too, and it always showed nothing in the results, that means that buffers were really clean. The reason why I am running this is for benchmarking of existing and new application.
Does anybody have any idea, suggestions, how to troubleshoot this issue ? I already closed all connections to this database, but rebooting the server is not an option since other people are also working on it.
Thanks
Does anyone know how to measure the buffer cache hit ratio? I have been reading a lot about it but can't find this measurement in Performance Monitor.
Thanks
What is better values for Buffer Cache Hot Ratio in SQL Server 2012. Is the values changed from 2008r2 to 2012?
View 2 Replies View RelatedI am wondering if 100% buffer cache hit ratio is considered not good in general?
Are there instances that it is actually bad and can contribute to server performance degradation?
Any thoughts on the topic most welcome :)
--------------------
keeping it simple...
This issue just happen recently. The buffer cache ratio went from > 90%to 50% and has slowly been climbing back up over 8 hours or so. Itscurrently @ 76%. Is this something I should take action on immediately?It seems to be coming back to normal...
View 1 Replies View RelatedHiI have trouble with MSSQL2000 SP4 (without any hotfixes). During last twoweeks it start works anormally. After last optimalization (about few monthsago) it works good (fast, without blocks). Its buffer cache hit ratio wasabout 99.7-99.8. Last day it starts work slow, there was many blocks anddedlocks. There are no any queries, jobs and applications was added. Nowbuffer cache hit ratio oscilate about 95-98. I try update statistics andreindex some hard used tables, but there is no effect or effect is weryshort (after few hours problem return).Mayby somene know what it could be?Is it possible to estimate how each table (using DBCC SHOW_STATISTICS orDBCC SHOWCONTIG or others) how the table affect on total buffer cache hitratio?Marek---www.programowanieobiektowe.pl
View 1 Replies View RelatedWe are troubleshooting a performance problem and the test result is slow the 1st time but the subsequent runs are faster.. Logging out of application and log back in ( connecting to a new database session) did not clear the buffer cache as I thought it would.. When does the database clear the buffer cache? Is it not per database session?
I can issue CHECKPOINT and then run DBCC DROPCLEANBUFFERS to clear the buffers in the disk. But since we are testing from the application,do we need to run these commands via application code to clear buffer/per database session OR can we run these commands from a management studio session?
I've a spatial (GIS) Data which is used frequently insertion, updation.
5 lakh records insertion in daily basis. when I trying to generate reports last 3 days or one weak, it takes 20-30 minute.
very disappointing while playing with clients. how to boostup and perform fast.
I think as so once we set query plan in buffer permanently then i would be faster than ever.
I have a virtual server (VMware ESX) with 64GB RAM running a single instance of SQL 2012 SP1. The max memory config is set to 59392 (58GB).
The Page Life Expectancy for this server has been averaging well under 10 mins for the last few days, according to our monitoring.
I have been checking the amount of data in the buffer cache periodically during the day with the below query, which seems to show that there is never more than about 10GB of data at any one time, frequently dropping below 5GB:
SELECT COUNT(*) AS BufferPages,
CONVERT(decimal(10, 2), COUNT(*) / 128.0) AS BufferMB
FROM sys.dm_os_buffer_descriptorsWhy would the amount of cached data be so low (and cause so much churn)?
I am aware that other things will require some of that memory (plan cache etc.) but with Max Mem of 58GB, I would expect there to be a much higher amount of actual cached data at any one time. I did the same checks on another VM with the same amount of RAM/Max Mem setting, and there was 50GB of data in the cache, with PLE measured in hours.
I am using SQL 2012 and I am trying to find buffer cache usage by DB objects within a particular DB.
I am running the following query
select
name as DB,
objname as db_object_name,
COUNT(name) as cache_page_count,
COUNT('x')*8.0/1024 as size_mb
[Code] ....
Following are the results:-
DB db_object_name cache_page_countsize_mb
TEST_DBNULL 428 3.34375
TEST_DBsysobjvalues 369 2.882812
TEST_DBsyscolpars 44 0.34375
TEST_DBsysssislog 38 0.296875
....
.....
Question- Why am I getting 428 pages for which there is no corresponding DB object? Why are so many pages present in sys.dm_os_buffer_descriptors but are missing from sys.allocation_units.
I'm getting an alert which states that both my Buffer Cache Hit Ratio and PLE are low on one of my SQL Servers though I'm not sure how to correctly check this.
I ran:
SELECT object_name, counter_name, cntr_value
FROM sys.dm_os_performance_counters
WHERE [object_name] LIKE '%Buffer Manager%'
AND [counter_name] = 'Buffer cache hit ratio'
Which gives me the Buffer Cache Hit Ratio, cntr_Value of 9 though its constantly dipping between 3-3000 and is never steady and I'm unsure if this is normal.
I also ran:
SELECT object_name, counter_name, cntr_value
FROM sys.dm_os_performance_counters
WHERE [object_name] LIKE '%Buffer Manager%'
AND [counter_name] = 'Page life expectancy'
Which gives me the Page life expectancy of 209061.
If these values would cause concern and if this is a normal Buffer Cache Hit Ratio? It's constantly dropping from high or low from what I can see. These scripts were pulled from another forum and I'm assuming they're showing the correct values.
Our server administrator forwarded some messages from SCOM that indicate:
SQL DB Engine 2012 Page Life Expectancy and Buffer Cache Hit Ratio is too low
When I logged into the offending server, I could not find anything in the SQL Log File that indicates this.
I was wondering how did SCOM identify this issue - where in SQL Server would this have been reported to SCOM?
How do i check the size of the datacache allocated from the buffer pool by sql server?
DMV or anything to show me the pool allocation sizes for the various pools in sql server i think i may be able to work from there.
I would like to remove an index from my database, but I need to verifythat it is not being accessed before I do that.I tried running Profiler, but it doesn't seem to be giving me theinformation I need. I put in a filter for ObjectName, but it seems tobe ignoring it - i get several entries in the profile trace, but novalue in the ObjectName column.Is there an easy way to monitor for object access?Thanks so much!SQL Servef 2000 SP4(I also have 2005, SP2, if there's a better way to do this with 2005)
View 3 Replies View RelatedMicrosoft recommends a 1MB L2 processor cache for SQL2000. I only have a 256K cache. What is the impact and what can I do, other than replace my procs, to compensate.
Thanks in advance.
Would the Performance Monitor be the best tool
to use if you wanted to find out how many transactions
are being process a day?
Hello all,
I want to know whether any performance monitoring tools/procedure available in market for SQL Server other than Performance monitor, Profiler, Query Ananlzer of SQL Server.
thank you in advance.
regards,
Nana
Hi guys!
Please tell me where is mistake?
I have win.nt workst. 4.0 and SQL Server 6.5 Client Configuration Utility installed.
I open Performace monitor and try to add to chart sql server which already have been registered in SQL Enterprise Manager.
And I have error message: Computer name not found.
Why??????
Thank you.Sev
Until this week, I had full functionality of SQL Monitor`s capabilities to monitor SQL Server. Now, when I select our Production Server and attempt to `Add to Chart` I am unable to view/select any SQL Server... entries in the `Object` dropdown list box. When I click the down arrow with the Development server selected I DO see all of the SQL Server selections. This inability to `see` the SQL Server functions in the Performance Monitor for the Production server exists regardless of whether I attempt to view them from a Win NT 4.0 Workstation or at the Server`s console. Again, I had full functionality from both locations last week. The logins have not changed. What has changed?
ANY help would be GREATLY appreciated. I need to monitor this system and I`m running blind at the monent.
TIA
Mike Gaudet
Visages, Inc.
Help ????????
I have a winnt and sql server 6.5 when i open up sql performace monitor it doesn't show any thing it comes blank when i go to reintialize the sqlserver object is not there i need to know how can i fix it
its urgent
girimanjesh
Does anyone know of a good and preferably free sql performance monitor? I feel my site is running a little slowly after some changes i made and i would like to check it out. Thanks.
View 1 Replies View RelatedI am learning about using the Performance Monitor (SQL Server 7.0).
What I am attempting to do, is to create a very simple log and then
see if I can have the information in the log charted back to me.
I create a log containing:
Process - Page File Bytes
System - % Total User Time
The size of the log file created is 122kb.
I am trying to make sure I very careful following the instructions
in the HELP contents info.
I believe I have correctly specified the type of data I am interested
in, the instance I am interested in, and the parent, etc..
Selected the time frame I am interested in using the scroll bars.
Everything seems to work, except for one thing. I get no chart
information.
Any insight, suggestions, recommendations, etc. will be appreciated.
Thanks for your help. It is appreciated.
Hi All,
I've been asked to trouble shoot an installation where many stored procedures are performing poorly. Upon examination I've found that the queries in these procs consume a large volume of logical IO (table scans etc). I'm trying to show that this could cause poor performance of the stored procedures as well as degredation of the server as a whole - but I cant find any suitable counters in Perfmon.
Anyone help?
Jim
Hi!
When I run the PerformanceMonitor for SQL7 on my computer the Object-combobox shows the SQL-parameters.
But when I run the PerfMon on another computer (with SQL7) these parameters won't show.
Is this a registry-problem or??? What can I do to make these parameters visible???
regards
/Hans Bäck
anyone else having issues with the SQL Server 7.0 specific objects in performance monitor not being available from remote locations. I am monitoring our production SQL Server 7.0 machine from my local, development SQL Server 7.0 box. If I try to access the SQL Server objects for the development server (local) I have no problem. If I try to access the production machine's (remote) objects, they are not available in the object drop down. I'm also able to access the development objects from my workstation (third machine) but not production.
Any tips would be greatly appreciated...I would really love to be able to see how well (or not so well) the databases are performing in real time.
Thanks,
David.
Any suggestions on getting them back? Reinstalling SQL didn't do anything. And yes, I am server administrator.
Thanks!