L2 Cache For Performance
Oct 30, 2001Microsoft 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.
ADVERTISEMENT
Performance Monitor -- Buffer Cache Object
Jul 2, 2007Hello,
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
Testing Query Performance - Clear Out Cache
Apr 3, 2006I am trying to improve the performance of a query. No matter how badit runs the first time, it runs really fast the second time.So how can I tell if I've done anything to improve the query if italways comes back quickly after the first run? I assume thequery/data/plan is in cache - how can I clean it out for my session?Thanks in advance for any help you can provide -
View 4 Replies View RelatedUnable To Connect To SQL Database 'MySite-Cache' For Cache Dependency Polling.
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....
SQL2K - Clean Buffer Cache And Procedure Cache.
May 31, 2007Is 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.
Sys.dm_os_memory_cache_counters Vs. SQL Server:Plan Cache Cache
Feb 15, 2008Hi 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?
Cache Hit Ratio Vs Buffered Cache Hit Ratio
Mar 13, 2003On 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.
[Performance Discussion] To Schedule A Time For Mssql Command, Which Way Would Be Faster And Get A Better Performance?
Sep 12, 20041. Use mssql server agent service to take the schedule
2. Use a .NET windows service with timers to call SqlClientConnection
above, which way would be faster and get a better performance?
SQL Cache Vs Cache
Jul 12, 2006I 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 RelatedJob Cache
Jul 9, 2002Hi 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.
Cache
Dec 3, 2001In Sybase, I can bind a database or table to cache, can I do the same
on SQL 7.0?
How To Cache ?
Sep 9, 2005Hi..
I don't know this is possible or not.
for example.. I have a blog site..
my entry links are like that
blog.asp?ID=33
blog.asp?ID=36
36 points "select * tbl where id=36"
And approximately BLOG #36 has 400 views everyday..
content is same.It never change..
Everyday my application performs "select * tbl where id=36"
with direct ASP or Stored Procedure..
Do you have any solution about this ?
How to improve performance..
Just imagine, If entry #36 had 2.000 views everyday ?
just example..
Of course the less perform query, the more performance..
Job Cache
Mar 14, 2008Hello!
When I create new job, I get a message "Job cache 97% full"
What should I do? And what IS a job cache?
Thanks!
Makkaramestari
Extremely Poor Query Performance - Identical DBs Different Performance
Jun 23, 2006Hello Everyone,I have a very complex performance issue with our production database.Here's the scenario. We have a production webserver server and adevelopment web server. Both are running SQL Server 2000.I encounted various performance issues with the production server with aparticular query. It would take approximately 22 seconds to return 100rows, thats about 0.22 seconds per row. Note: I ran the query in singleuser mode. So I tested the query on the Development server by taking abackup (.dmp) of the database and moving it onto the dev server. I ranthe same query and found that it ran in less than a second.I took a look at the query execution plan and I found that they we'rethe exact same in both cases.Then I took a look at the various index's, and again I found nodifferences in the table indices.If both databases are identical, I'm assumeing that the issue is relatedto some external hardware issue like: disk space, memory etc. Or couldit be OS software related issues, like service packs, SQL Serverconfiguations etc.Here's what I've done to rule out some obvious hardware issues on theprod server:1. Moved all extraneous files to a secondary harddrive to free up spaceon the primary harddrive. There is 55gb's of free space on the disk.2. Applied SQL Server SP4 service packs3. Defragmented the primary harddrive4. Applied all Windows Server 2003 updatesHere is the prod servers system specs:2x Intel Xeon 2.67GHZTotal Physical Memory 2GB, Available Physical Memory 815MBWindows Server 2003 SE /w SP1Here is the dev serers system specs:2x Intel Xeon 2.80GHz2GB DDR2-SDRAMWindows Server 2003 SE /w SP1I'm not sure what else to do, the query performance is an order ofmagnitude difference and I can't explain it. To me its is a hardware oroperating system related issue.Any Ideas would help me greatly!Thanks,Brian T*** Sent via Developersdex http://www.developersdex.com ***
View 2 Replies View RelatedConfiguring SQL Cache
Apr 25, 2007Hi all,
I have a question regarding SQL caching.
I want to use SQL caching for my pages.I've gone through http://msdn2.microsoft.com/en-us/library/e3w8402y(VS.80).aspx article on msdn, where in step by step procedure is explained for this. But I have a slightly different situation. In the article, we need to configure our application from web.config by following...
<!-- caching section group --><caching> <sqlCacheDependency enabled = "true" pollTime = "1000" > <databases> <add name="Northwind" connectionStringName="NorthwindConnectionString1" pollTime = "1000" /> </databases> </sqlCacheDependency></caching>
Where in "NorthwindConnectionString1" is the SQLdatasource connection string. But I'm not using SQLDatasource, and have my own classes to build a connection datasource and get a dataset, and then bind it to my control.So in this case what should I write for the above "connectionstring" attribute. My connection string is in web.config only with a section defined. and in my application i'm reading from web.fing only.The connection section i'm using is as follows...
<ConnSettings>
<add key="ConnString" value="server=serverName;database=dbName;uid=dbuser;Pwd=password"/>
</ConnSettings>
I want to know how to configure my sql cache in this situation.
Thanks,
Mehul Mistry
Cache Invalidation
May 8, 2007Hello,
Am wondering if someone can give me a pointer on where to start with a query i have.
What i am trying to do is provide some sort of information to a user that data from a database has been changed. I know that you can cache a page and have output cache directive invalidate it next time it loads if changed but wondering if its poss to be told its changed without reload ( dont see how but never know) - even if not on that page.
What im kinda thinking is something like the popup that outlook has when a new message arrives in in box. Is that just sending a new query? is there a table last modified function in sql? etc.
This is for a web app in c#.
Any help would be appreaciated.
cheers
Help With Sql Cache Dependency
May 31, 2007Hello all.. i'm having a major issue with my Sql Express 2005 database :(
I'm using wicked code sitemap to allows for a sitemap to be stored in a database.. it uses sql cache dependency to invalidated the cache bla bla
Problem:
After i update a record / add new record the database generates a SqlQueryNotificationStoredProcedure
But it never gets executed. I've done tests on the code it's calling everything accordingly so i'm assuming the problem lies in a configuration setting of the database
done alot of searching around the net and i've found this
GRANT SUBSCRIBE QUERY NOTIFICATIONS TO username
i'm using Windows Authentication how do i run this and will this solve the problem
Thank you in advance
Chris
SQL Cache Dependency
Feb 8, 2008I'm working off of the example shown here:
http://www.c-sharpcorner.com/UploadFile/mosessaur/sqlcachedependency01292006135138PM/sqlcachedependency.aspx?ArticleID=3caa7d32-dce0-44dc-8769-77f8448e76bc
The tutorial shows that an entry must be made in web.config for a sqlCacheDependency node in web.config. When a dependency is added, they set an attributed called "connectionStringName" that references a connectionString established earlier in the web.config. My question is twofold:
1). First, I tried setting up my connection string using the connectionStrings node (my other apps use the AppSettings node), but when I try to extract the value in my code using the following syntax:
connStr = Convert.ToString(System.Configuration.ConfigurationManager.ConnectionStrings["devConnStr"].ConnectionString);
I get the following compilation error: "ConfigurationManager does not exist in the class or namespace System.Configuration";
Am I extracting it with the wrong code? Does that setup exists in .NET v 1.4? No, I cannot use .NET v 2.0 for various reasons.
2). If I cannot use ConnectionStrings in that way and must use AppSettings, how do I set up SqlCacheDependency node to recognize that connection string?
Cache Hit Ratio Over 100%
Sep 18, 2000I have been seeing this strange statistics in one of our servers. The cache hit ratio has gone beyond 100%, it is currently showing 124%. Has anyone seen this before.
Thanks
Procedure Cache ?
Nov 1, 1999I 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.
Buffer Cache
Sep 30, 1999Help, 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
Database Cache
Aug 16, 2000Hi,
I was wondering if anyone knew where I could find good information on performing a database cache. I want to cache tables and run queries from them within a Cold Fusion Application.
Thanks.
Cache Hit Ratio
Mar 18, 2005I have a large dell server with 4 processors, and 8 gig of memory on win 2000 advanced with sql 2000 enterprise edition running a 3rd party app. My cache hit ratio averages about 76%. I thought the gneral rule was if you get below 80% to add more memory. However my memory manager shows I am only using 71% of my memory and have a full gig available. I have the sql server set to use about 7.1 gig of the 8 gig on the server. My ? is if I am only using 71% of my memory, will will adding more memory actually help my cache hit ratio
View 5 Replies View RelatedProcedure Cache
Jul 28, 1999Ours 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.
Procedure Cache
Feb 11, 1999Hello 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
Flushing Cache
May 31, 1999I am doing performance testing and I would like to be able to flush the data cache without re-starting the server. Can this be done?
View 2 Replies View RelatedTable In Cache
Jul 9, 2002Hello,
Can u put table in cache in MS SQL Server?
Thanks
Rea
Data Cache
Jun 29, 1999I have a server where the cache hit ratio averages 99.5%, however the cache flushes figure is high at 13068 over half a day, the avg free page scan is 122, both above what microsoft reccomend.
The server has 320Mb memory of which 272 is allocated to SQL Server.
Of the 272, 229.9 is allocated to the data cache.
I would be grateful of any suggestions to improve the situtaion
Thanks in advance
Tom Willetts
Cache Hit Ration On SAN
Dec 2, 2004We recently moved a database to the SAN and it is not performing so well. Watching performance logs I have noticed that the Cache hit ratio is only around 60%. I checked memory right away and that seems to be fine. Plenty of physical memory available and only about 40% is committed to use.
The SAN is currently configured to have 200 mg of Read Cache, I would imagine that is a little low, but not sure.
This is the first time we have ever put a database on the SAN so our knowledge of optimization is lacking. Any ideas on how to improve performance would be helpful.
Thanks much
How Do U Clear Cache In SQL
Dec 14, 2006How do u clear Cache in SQL
if i run a query once it takes 10 seconds and if i run the same query again it takes 1 second because it is cached. So i want to know how i can clear it because i want do some benchmarking on a query that is in cache
SQL Server Vs Cache
Apr 2, 2004I'm very confused about which dbms to use. I've two choices: MS SQL Server 2000 and Intersystems Cache. Although Cache is post relational I don't know anything about it. However it has object oriented features, I know how to do things in SQL Server.
Can anyone give me the advantages and disadvantages of both systems in this situation?
Thanks in advance.
How Does Cache Work?
Apr 15, 2008is it possible that sql statements cached from a program running this morning (that has now ended) and that they are still running in the sql?
I see records being added when they shouldn't be now and i'm wondering if sql could have cached the statements as the server was very slow at the time.
please advise?
Indexes In Cache
Aug 15, 2007Using DMV's (or anything else), is it possible to write a query that tells us all the queries in the SQL cache that are using a certain index?
(Looking at sys.dm_db_index_usage_stats I may deduct that an index is rarely used, but without knowing where it DOES get used I can't safely test the impact of dropping it.)