Using SQL Server 2000. When does SQL flush or clear the procedure
cache? 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 the
execution plan from cache?
Thank you in advance.
Jack
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.
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.
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
Is there anyway to clear the procedure cache of a single procedure?
View 9 Replies View RelatedI 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.
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.
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
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
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
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
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
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...
View 1 Replies View RelatedI 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
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.
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....
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.
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
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
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?
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?
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
Recovery model: Simple with Full backups
begin transaction
begin try
       insert into [EthnicRace] select * from [OEPRD].[CIS_Source_Data].[dbo].[EthnicRace];
       insert into [MilestoneOwner] select * from [OEPRD].[CIS_Source_Data].[dbo].[MilestoneOwner];
       insert into [PS_ACAD_CALTRM_TBL] select * from [OEPRD].[CIS_Source_Data].[dbo].[PS_ACAD_CALTRM_TBL];
       insert into [PS_ACAD_DEGR] select * from [OEPRD].[CIS_Source_Data].[dbo].[PS_ACAD_DEGR];
end try
A job on our production server goes out to Oracle and gets raw data from our student system once per night. A job on our development server then uses the above coding to copy that raw data from production to the tables in our development system. My question is, will the log continue to grow until the "end try" is encountered or is it cleared at the end of each INSERT statement?
I have a report created in Reporting Services that contains 5 parameters. Two are text [date] fields, and three are drop-down multi-value parameters. One is driven from the result of another, and both of those work fine. My issue is with the final multi-value parameter, which is simply a list of customers. It gets populated from the data set without a problem, and I can select from 1 to all of the options. However, on submitting the report. This one parameter gets cleared out, the report does not run, but instead waits for me to select the customers (again) and resubmit.
Occasionally, I can select a few customers and it will, in fact, run the report. However, 90% of the time it just clears the field and waits.
I can trace the database, and everything looks normal - on submit nothing is sent to the database, so it's not like there's a problem with the query. I've verified the customer table and all records look similar - I don't see any obvious data issues.
Suggestions?
Hello,
maybe it's a silly question...
I've created a new report by the wizard (including a data query). In the dataset frame my dataset contains the queried items.
But when I change to data view and back to layout view in the designer frame, my dataset is cleared.
Is this a bug or normal behaviour?
Regards
Rayko
I have installed sql server 2005 in cluster. after all the process is finished the memory usage is showing 2 gb where as in the activity monitor there is no process running. what should i do to clear the memory automatically.
If i stop and start the serverice it is cleared, nor do i want to run any command to clear the memory.
I have a very odd problem. I have a package which uses some custom tasks that were written in C#. When the package is deployed to our production server, *some* of the property values for *some* of the tasks are cleared. For example, I have these five tasks:
FP Export File Logger
FP Import File Logger
FP Import Table Logger
FP Instance Logger
FP Job Reader
All of them inherit (of course) from Microsoft.SqlServer.Dts.Runtime.Task. All of them have custom members (some similar, some different), and of course, different implementation (though they are mostly the same). This test package has one instance of each of the different tasks.
As I said above, when we deploy to our production server, *some* of the property values for *some* of the tasks are cleared -- but when deployed to our dev server, everything remains intact.
Here is what is cleared:
- On 4 of the 5 tasks, the Description property (inherited by Task) is cleared, but the other one remained intact
- On 3 of the 5 tasks, the Connection property (custom property in all tasks) is cleared, but the other two remained intact
- 3 of the tasks have other string properties that were set, and all of these were cleared
We can reproduce this on two different production servers, and these two servers have some different configurations, suggesting these would not be the culprit:
- They have different service packs (one is build 2047, the other build 3042)
- One has the custom SSIS components installed (in the GAC), the other one does not
Our development server, where the package is deployed as expected, has build 2047 w/ the components installed.
Here are the packages, where you can compare and see the differences (using a text comparison tool):
Dev-GOOD.xml
Prod-BAD.dtsx
These were created after being deployed by importing within a Visual Studio SSIS project from the server.
Any suggestions would be *greatly* appreciated, as we are totally stumped as to why this is happening.
EDIT: Additional clues, this package is deployed to the MSDB. If it's deployed to the File System, it remains unmodified.
Thanks in advance.
Jerad
If I create a memory table inside a while loop, I expect that every loop the memory table is (newly) created and thus empty.
But when I test this, I see that on the second, third, ... run the inserted data in the memory table is still present and not cleared.
This can be reproduces with the following code:
DECLARE @tbl TABLE
( [id] BIGINT )
DECLARE @tbl2 TABLE
( [value] BIGINT )
INSERT INTO @tbl
VALUES (1), (2)
[Code] ....
/*
Expectation: twice 11 and 12 in @tbl2
Actual result: three times 11 and 12
*/
SELECT *
FROM @tbl2
Is this a wrong assumption or is this a bug in SQL Server? (Tested on: SQL Server 2014 and 2008).
I have a report that includes two multi-valued parameters.
In the Default Values section, I choose 'from query' and select dataset and value field.
In the Available Values section, I choose 'from query' select the same dataset and value field, and in the label field I select the relevant label field.
When I run the report my multi-valued parameters look like I selected the option 'select all' (all options are selected).
How can I keep the multi-valued parameters cleared from selections until the user select his choice? Thanks in advance.
Hi, firends,please look at this:
Prepare:
1.prepare a SQLTask component, and read a table by it, return the result in an Variable Object(RegionDim).
2.Pass the Variable into a Taskscript component. In the Script, write this:
Public dtRegion As New DataTable
Public daRegion As New OleDb.OleDbDataAdapter
daRegion.Fill(dtRegion, Dts.Variables("RegionDim").Value)
3.Use dtRegion in the script. It's OK.
Problem:
After the TaskScript, the RegionDim is be cleared in fact. So I can't use it in other places, and need to read the table again.
I think the "daRegion.Fill(dtRegion, Dts.Variables("RegionDim").Value)" mark the RegionDim as the dtRegion, and the dtRegion is a variable scoped inside the Script, which will be distroyed after the Script. So the RegionDim is cleared.
How to avoid this?
Thanks.
Ivan
On Microsoft performance monitor, what is the difference between SQL Server Cache Manager: Cache Hit Ratio and SQL
Server Buffer Manager: Buffer Cache Hit Ratio? We have a production server where the buffer cache hit ratio is
consistently at 99%, which is normal. However, the cache hit ratio is 73%. What is the difference between the two
hit ratios, and why would we have such a significant difference between the two?
Any help or advice would be much appreciated.
I read about the SQL 2005 Buffer Cache and the .NET cache.I tried it on about 8000 users query. Both are fast....SQL 2005 being a little faster (probably due to I was sorting the .NET Cache).Any comments?
View 1 Replies View RelatedHi there,
We have cluster server and we are using sql server 7, everything was working fine on node a and when we move to node b and run the job from the jobs it gives the error message:
Error 22022:SQLServerAgent Error: job ox7bb7d7bf23b8974d8ea8f15e43e854cf
does not exist in the job cache
Can anyone help on this.
Thanks in advance.
Madhu.