Procedure Cache Hit Rate
Feb 9, 2007
I have installed a SQL Server diagnose tool for evaluation. It prompts and warns me that "Procedure Cache hit rate is for example 15%. Its help indicates:
The Procedure Cache Hit Rate alarm is raised when the ratio between the number of times SQL Server looks for a plan in the procedure cache and the number of times it does not find a required plan in the procedure cache falls below a threshold.
A low procedure cache hit rate indicates that SQL Server is finding fewer of the query execution plans it needs already in memory and therefore has to perform more compiles. These extra compilations will degrade SQL Server performance by causing extra CPU load.
What can I do to increase the rate?
Canada DBA
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Mar 18, 2008
I have a 32 bit SQL 2005 EE clustered installation with 10GB of physical memory and AWE enabled. Our monitoring tool, Spotlight, is reporting the Procedure Cache to be 384MB and a Hit Rate of 75% on a fairly regular basis. Sometimes the Procedure Cache increases to 495MB and a Hit Rate of 82%.
(1) With 2005 can the Procedure Cache be increased?
(2) What is the max size of Procedure Cache?
(3) How do I increase the Hit Rate to a higher percentage?
I do not encounter the issue on any other SQL Server installation, however this is our only cluster.
DBCC PROCCACHE
num proc buffs = 64889
num proc buffs used = 1135
num proc buffs = 1135
active proc cache size = 2896
proc cache used = 364
proc cache active = 364
Thanks, Dave
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May 31, 2007
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.
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Sep 12, 2014
Is there anyway to clear the procedure cache of a single procedure?
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Nov 1, 1999
I know this might be a dumb one, but what the heck. My new 7.0 server's procedure cache
stays at 100%. After researching this looks like what I want. Nay response appreciated.
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Jul 28, 1999
Ours is a MSSQL Server Client server application with very minimal usage of Store procedures.
The proc cache is configured at 5%.I execute "dbcc proccache" to keep track of the proc cache.
I have seen that the "proc cache size" reduces to a very small a amount when there is peak usage.
It starts at 42,000 and comes down to 400, though it is always greater than "proc cache used".
I am worried if this causes crashes.
Please advise why this happens and solutions if any.
Thanks in advance,
Ramakrishna seelam.
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Feb 11, 1999
Hello folks!
We are going to install SQL server 6.5 with MSMQ.
And set 128M memory for SQL Server.
What % Procedure cach do you recomend to set?
Thanks,
Alona
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Apr 26, 2000
Hi Everybody!
In the application I have, database interaction is mainly through stored procedures.
Currently the setting for procedure cache is 30%. Does anyone have experience with having had changed this and effect on performance?
Thanks!
- Manoj
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Jun 1, 2001
Is any way we can tell sql server to keep specific (long runing) query in procedure Cache.
I already tried to do this by creating job (run every 1 hr from 8 am to 6 pm)
but is not enough
Thanks
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Jul 15, 2002
Is there a way to increase the size of the procedure cache. Or is it only a auto configuring option.
I have 2gb of memory, and when I check the size of the procedure cache it is just 10mb. I would like to increase this to around 50mb. Not sure if there is an setting to do this. Had a look on BOL could not find anything.
thanks
Jane
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Jun 20, 2014
I'm putting together some monitor scripts, have buffer cache ratio etc etc but struggling to get an accurate script for the current procedure cache hit ratio...
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Jul 23, 2005
Using SQL Server 2000. When does SQL flush or clear the procedurecache? I am dynamically creating and dropping stored procedures (SP).Does SQL clear the cache for the SP that has been dropped? If not,when the SP is recreated (with the same name), does SQL use theexecution plan from cache?Thank you in advance.Jack
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Apr 28, 2008
My server (SQL 2005 SP2) typically runs with a procedure cache usage of about 92% or higher... lately it seems like at some point in time during the day it just drops to anywhere between 50% and 65%... with this comes horrible server performance and many snowball effects. If I clear the procedure cache it will go up only about 10% for a minute or two. The only way I can get it to recover completely seems to be restarting the SQL service. Then it will be fine till the next incident. The database is a read only (not set to read only but no updates other than replication). and the same SPs are run over and over and over throughout the day. also did notice that the compiles of the SPs goes up drastically at this point also. not sure if this is part of the cause or part of the effect.
CPU is normal. response from anything (even sp_who) is slow.
i do not understand the way procedure cache works completely so I thought I would ask for some direction.
Any ideas where to look or where to start???
Any thing I can do to catch this when it happens would be great.
thanks a head of time.
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Dec 27, 2007
Im getting this error when trying to set up a cache dependency...are there any special permissions etc?From CS:SqlCacheDependency dep = new SqlCacheDependency("MySite-Cache", "Products");Cache.Insert("Products", de.GetAllProductsList(), dep); From connectionStrings.config:<add name="SiteDB" connectionString="Data Source=localhost,[port]SQLEXPRESS;Integrated Security=true;User Instance=true; AttachDBFileName=|DataDirectory|ASPNETDB.MDF" providerName="System.Data.SqlClient" />Also tried this using my machinename<add name="SiteDB" connectionString="Data
Source=<machinename>,[port]SQLEXPRESS;Integrated Security=true;User
Instance=true; AttachDBFileName=|DataDirectory|ASPNETDB.MDF"
providerName="System.Data.SqlClient" /> From web.config: <caching> <sqlCacheDependency enabled="true" pollTime="10000"> <databases> <add name="MySite-Cache" connectionStringName="SiteDB" pollTime="2000"/> </databases> </sqlCacheDependency> </caching> EDIT: So making progress I can't seem to get the table registered for cache dependency:The sample i have says"aspnet_regsql.exe -E -S .SqlExpress -d aspnetdb -t Customers -et"and the command line response is "Enabling the table for SQL cache dependency..An error has happened. Details of the exception:The table 'Customers' cannot be found in the database."Where does this "Customers" table come from? There is obviously not an application specific "Customers" table in aspnetdb I'm confused probably more by the example than anything....
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May 30, 2008
from BOL:
"
Restoring a database clears the plan cache for the instance of SQL Server.
"
i'm seeing this behavior after log restores as well.
what's the reason the whole procedure cache is flushed?
thanks.
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Dec 19, 2005
I was wondering if SQL Cache Dependency would be in fact invalidated if:
1. it was created based on a procedure type command.
2. if the select statement retrieves the data from multiple database tables
Any help would be more appreciated. I am stuck with the fact that none of the data bases on sql dependency is invalidated. I spent literally hours to understand what i am doing incorrectly.
Thanks
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Dec 6, 2000
We see the following message in our error log.
WARNING: Clearing procedure cache to free contiguous memory.
It is accomonpanied by fairly intensive CPU activity.
We get this roughly once per working day.
Anyone have any idea why, and what we can do to stop this?
Regads,
Jim Plant
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Jun 15, 2015
I want to analyze procedure cache, to find inefficient plans and parameter issues.
I do it trow DMV But my requests to DMV are very slow and demand resources because procedure cache is about several GB Actually I dont need on-line analysis.
Is it possible to have fast snapshot of procedure cache?
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Feb 15, 2008
Hi guys,
I am looking at the plan caches/cached pages from the perspective of
sys.dm_os_memory_cache_counters and sql serverlan Cache - Cache Pages
For the first one I am using
select (sum(single_pages_kb) + sum(multi_pages_kb) )
from sys.dm_os_memory_cache_counters
where type = 'CACHESTORE_SQLCP' or type = 'CACHESTORE_OBJCP'
a slight change from a query in
http://blogs.msdn.com/sqlprogrammability/
For the second just perfmon.
The first one gives me a count of about 670,000 pages only for the object and query cache and the second one gives me a total of about 100,000 pages for five type of caches including object and query.
If I am using the query from http://blogs.msdn.com/sqlprogrammability/ to determin the plan cache size
select (sum(single_pages_kb) + sum(multi_pages_kb) ) * 8 / (1024.0 * 1024.0) as plan_cache_in_GB
from sys.dm_os_memory_cache_counters
where type = 'CACHESTORE_SQLCP' or type = 'CACHESTORE_OBJCP'
it gives me about 5 GB when in fact my SQL Server it can access only max 2GB with Total and Target Server Memory at about 1.5 GB.
Does anyone have any idea what is going on?
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Sep 17, 2015
The plan cache is cleared automatically (every 30-60 seconds) on our high load OLPT server.
Can't find a reason for it. I have been logging procedure cache thru dm_exec_cached_plans, every second for a couple of minutes.
It shows that it doesn't grow beyond 200Mb. SQLserver has 64Gb available.
DBCC FREEPROCCACHE is not executed.
dm_os_memory_clerks shows the same 200Mb max (approximately).
I disabled the SQL Agent, still happens, so it's not a job causing the problem.
I disabled the Resource Governor, still the same problem.
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Dec 6, 2007
Hi everyone,
I posted a related thread before about this error below when I process a dimension. And seems that the solution by using "ClearCache" can not fingure out the issue when I want to process a mining structure...... .
OLE DB error: OLE DB or ODBC error: There is not enough procedure cache to run this procedure, trigger, or SQL batch. Retry later, or ask your SA to reconfigure SQL Server with more procedure cache.
; Sort failed because there is insufficient procedure cache for the configured number of sort buffers. Please retry the query after configuring lesser number of sort buffers.
Could someone please give me some suggestions?
Your help will be very appreciated:-)
Thanks^_^
Winnie
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Oct 13, 2004
If you are familiar with Crystal reports or Visual basic, you may be familiar with the Rate and Pmt functions.
I need to duplicate them in SQL sever 7.
Anybody have code for this already? I hate re-inventing the wheel.
More (Unnecesary) details:
I have a client who has handed me the formula that I need to use for calculating Interest rates. Unfortunatly, the formula was written in Crystal reports, so now I need to pick it apart and do the work that CR does automaticly. Any help?
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Oct 27, 1999
Hello,
Does 7.0 store db Growth rate information?
I am looking for information that tells me how fast a db is growing in MB and or percentages over a given period of time, ie weekly, monthly, yearly etc. Either in real numbers or estimates. Does 7.0 already store something like this or do I need to create some code for this?
Or does someone have something like this already coded that they would be willing to share?
Thank you in advance.
Troy
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Jul 15, 2004
Hi,
I want to store tax rate in my tables. I set the data type to float, I wan't 4 decimal places and the data in the table has 4 decimals, but when I run a query in query analyzer it returns: 4.4999999999999998E-2 instead of 0.045.
How can I fix this?
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May 8, 2008
I am working with a company that needs some SQL Reporting developed. What is the going rate for SQL Reporting work?
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May 29, 2014
I have a Table as below
Month Year Rate
1 2013 100
2 2013 101
8 2014 105
The rate is the value for the Month(1)January and year 2013.
I wana have a query which need to get rate value between 3rd month 2013 and 5the month 2014.
The Output has to be
3 2013 101
4 2013 101
5 2013 101
to
4 2014 105
5 2014 105
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Jan 25, 2003
anyone wrote a function to calcuate internal rate of return?
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Apr 30, 2008
I've got a statistics table that I've been writing to for about 2 years now. Every saturday night, a size (in MB) snapshot of each DB file is taken and dumped into this table. I'm then emailed a copy for that week.
Now, I'm trying to figure out what the fastest growers are. Here's the table ddl
CREATE TABLE [dbo].[DBSizeStats] (
[statid] [int] IDENTITY (1, 1) NOT NULL ,
[LogDate] [datetime] NULL ,
[Server] [varchar] (10) COLLATE SQL_Latin1_General_CP1_CI_AS NULL ,
[DBName] [varchar] (200) COLLATE SQL_Latin1_General_CP1_CI_AS NULL ,
[MDFName] [varchar] (200) COLLATE SQL_Latin1_General_CP1_CI_AS NULL ,
[MDFSize] [decimal](18, 0) NULL ,
[LDFName] [varchar] (200) COLLATE SQL_Latin1_General_CP1_CI_AS NULL ,
[LDFSize] [decimal](18, 0) NULL ,
[TotalSize] [decimal](18, 0) NULL
) ON [PRIMARY]
GO
What I'm trying to figure out is how to query the average monthly and yearly growth percentages per DB on the MDFSize column.
I'm usually pretty good at this sort of thing, but I just can't seem to wrap my head around how to solve this issue. I'm not having a very good math day.
what am I missing here?
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Mar 26, 2004
Have the following rate schedule - amount and discount rate
$0-10 = 1% discount
$10-100 = 2%
$100-over = 3%
I created the following rate table with min range and no max range so last entry will handle everything over 100$
$0 1%
$10 2%
$100 3%
I then create a view to translate it as min and max range
$0 10 1%
$10 100 2%
$100 max 3%
Select* from view where $10 between minrange and maxrange
give 2 rows
1%
2%
Question: Is there a way to structure the rate table so I can use SELECT BETWEEN and
what is the most common way to setup a rate table
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Aug 29, 2005
I need to pickup a tax rate, that is stored on a 1 record file. I would like to avoid using the CROSS JOIN. Is there a way to SELECT the record and set a Variable = to the tax rate so I can pickup the rate in another SELECT statement on each record?
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Oct 16, 2007
Hi
We are having problems with our SQL server 2000.
The problem is that on a daily basis we run out of disk space and I always have to run shrinkdatabase on tempdb.
Today we started with 160GB of free space and by the end of the day it was gone!
Yes we do have many jobs running on our SQL server pulling data in from many sources. But I dont know how to find out which job is causing this problem. I have a suspicion that it could be a job that runs hourly that pulls data from Oracle (approximately 10000 rows each time), but that job has been active since the 28th August 2007. We only started running out of space in the past 5 days. Any suggestions would be appreciated as to what is causing this or how to diagnose the problem.
Thanks
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Apr 21, 2006
Hi, all here, I found that in my case when I trained the data mining models, the model cover rate is very low (in my case, the train data set has 82 rows but the case occuring in the models I trained is only 25). How can I improve the cover rate to improve the quality of the models? (if it is possible in SQL Server 2005) I am using SQL Server 2005.
Cheers.
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Jun 12, 2007
Hi,
We have Asynchronous Database Mirroring on SQL Server 2005 SP2 Entprise Edition/Windows 2000 Advanced Server. We noticed that log sent rate is quite low (average 1.3 MB/sec) in most of the cases whereas "Log bytes flushed/sec" is high (1.4 MB/sec) as a result Log send queue keeps on increasing and finally taking all the transaction log space. Our disk queue length is always in range of 0.01. And prinicipal and mirror servers are on local LAN.
I tried on low end server and high end server and in both cases Log sent rate is approx 1.3 MB/sec (Maximum 4 MB/sec).
Is there any limitation on Log sent rate?
How can we improve on log sent rate? Since both servers are on local LAN, network bandwith does not seems to be an issue.
Any help is greatly appreciated.
Thanks,
Ramesh
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