SQL 2012 :: Plans Not Staying In Proc Cache
Feb 25, 2015
On one server I'm having an issue with and it having such a small procedure cache.
Server has 60GB of RAM assigned to its min and max server memory settings, optimise for ad hoc workloads is disabled.
Procedure cache at the moment on the server is 2.41MB with only 6 objects in side all related to mssqlsystemresource database, I can see stuff dropping in for user databases, but as soon as the proc has finished the plan is removed from the cache.
Buffer cache is in the 17GB mark, free pages around the 42GB mark so around 60GB used with a bit in stolen pages, but no proc cache.
All other servers in the environment are reporting over 8GB of proc cache in use which is more healthy.
Using Spotlight to monitor all of this.
Whats wrong with this one server and it not keeping the plans in cache.
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Apr 29, 2014
Any way to invalidate cached query plans? I would rather target a specific query instead of invalidating all of them. Also any sql server setting that will cause cached query plans to invalidate even though only one character in the queries has changed?
exec sp_executesql N'select
cast(5 as int) as DisplaySequence,
mt.Description + '' '' + ct.Description as Source,
c.FirstName + '' '' + c.LastName as Name,
cus.CustomerNumber Code,
c.companyname as "Company Name",
a.Address1,
a.Address2,
[code]....
In this query we have seen (on some databases) simply changing ‘@CustomerId int',@CustomerId=1065’ too ‘@customerId int',@customerId=1065’ fixed the a speed problem….just changed the case on the Customer bind parameter. On other servers this has no effect.the server is using an old cached query plan, but don’t know for sure.
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Apr 30, 2014
way to invalidate cached query plans? I would rather target a specific query instead of invalidating all of them.
Also do you know of any sql server setting that will cause cached query plans to invalidate even though only one character in the queries has changed?
exec sp_executesql N'select
cast(5 as int) as DisplaySequence,
mt.Description + '' '' + ct.Description as Source,
[Code].....
In this query we have seen (on some databases) simply changing ‘@CustomerId int',@CustomerId=1065’ too ‘@customerId int',@customerId=1065’ fixed the a speed problem….just changed the case on the Customer bind parameter. On other servers this has no effect. I’m thinking the server is using an old cached query plan, but don’t know for sure.
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Jul 11, 2014
We have just implemented a SQL 2012 always on environment. We have a primary and secondary server. I am confused about how to set up the backup plans. The application team was happy to tell me that in sql 2012 always on we can offload the backups to the secondary, thus reducing overhead on the primary server.
However, the secondary only supports copy only full backups. I am unsure how these would be useful in a disaster event? I could not apply any trx log backups on a copy only backup. This means I need to run my full backups on the primary server?
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Aug 19, 2015
Is the SQL Server Profiler Reads Column Incorrect For Parallel Plans?
I often use profiler as one tool to identify bad plans. The reads column gives me a good indication of excessive IO to dig into and correct if necessary. I often use it with Showplan so I can see what a query does, replicate it and fix it.
However I have just lost some faith in it. I am looking at a poorly performing query joining five tables. A parallel plan has been generated and one table is being scanned (in parallel) due to a missing index. This table had in excess of 4 million rows in it. The rest hitd indexes well. However the entire query generates ONLY 12 READS.
Once corrected, a single processor plan is used. This looks really efficient and uses 120 reads. That looks the right figure to me.
Does the profiler only display one thread of a parallel plan perhaps? Or something else?
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Jan 13, 2015
All the recommendations I see from Microsoft docs is to limit the use of Query Notifications (QNs) to notifying connected clients when changes to mostly-static reference or configuration data occur, and to keep the number of overall query forms in play and connected clients to a minimum. Any way regarding a more integral use of QNs and Service Broker from a web app to notify n-web servers (farm) of an update to data that could be updated concurrently and quite frequently, or with a system where the technique is used extensively with lots of different query forms?
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Jul 16, 2015
What is better values for Buffer Cache Hot Ratio in SQL Server 2012. Is the values changed from 2008r2 to 2012?
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Dec 12, 2007
Greetings. We have a group that doesn't want to move from 2000 into a 2005 environment, mainly for financial reasons. Highlights for this server:
The server is really currently used as a reporting box, and not at all for OLTP.
Data is extracted nightly from a mainframe, and dumped into various DB's.
There is no front end at all. Users connect via MS Access to query the data.
While new 2005 features would most likely be attractive to them (partitioning, snapshots, new features of Analysis Services, etc.), the real concern is cost.
They have no plans in the near future to do anything else with this server.
All this being said, are there any glaring risks to this group staying on SQL Server 2000 once it has entered into the Extended Support Phase? Any huge reasons why a group like this would need to upgrade to 2005?
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Sep 28, 2015
We 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?
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Feb 12, 2015
What is the use of running DBCC FREESESSIONCACHE.
How frequently can we do this on all the databases.
What happens if we schedule to run it every 1min.
Are there any advantages/disadvantages of running this on all databases.
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May 22, 2014
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.
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Jun 4, 2015
I am using SQL Server 2012 Express.
I am doing performance tuning of SP/Query in Dev-Test environment.
I found that SQL Server caches plan between successive executions.
So if I test/execute SP 10 times, after 1st or 2nd execution, SQL server will pull-up plan-info from CACHE...Not from SQL SERVER Or Database...
Means i am not getting correct answer...
I found this 2 commands:
DBCC FREEPROCCACHE
DBCC DROPCLEANBUFFERS
But they say that executing above command might interfere/bother other people executing other query/sp on this server.
They also say that: Freeing the plan cache causes, for example, a stored procedure to be recompiled instead of reused from the cache. This can cause a sudden, temporary decrease in query performance.
Part of query was using Dynamic-SQL executed with EXEC command.
I replaced that with SP_EXECUTESQL.
How can I start testing of each SP-run with Fresh/Blank CACHE ?
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Jun 22, 2015
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.
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Aug 17, 2015
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.
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Jun 4, 2015
We are using the cache transformation in our project , while doing the cache transformation our disk space goes to 0 MB free and SSIS package execution not completes even after 3 hr..Initially we have around 34 GB free space on C: drive .Our server configuration is 64 RAM. We are caching the data from table which contains around 21 million records.We changed the path in properties (“BLOPTempStoragePath”,”BufferTempStoragePath”) of Data Flow task of SSIS in which we are using Cache Transformation.
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Sep 12, 2014
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?
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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 31, 2007
Is there a way to drop clean buffers at the database level instead of the server/instance level like the undocumented DBCC FLUSHPROCINDB (@dbid)??
Is there a workaround for dbo? to be able to flush procedure and data cache without being elevated to sysadmin? 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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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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Feb 13, 2012
I have a report designed in SSRS 2008 R2.My issue is that the data labels do not stay outside the bars for high values.
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Sep 12, 2014
Is there anyway to clear the procedure cache of a single procedure?
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Apr 14, 2015
I have a table that has the following data
ID
---
101
102
105
108
124
189
I need to call a stored proc for each of the IDs above. Our existing code which has a cursor to loop through the table and call the proc for each value is proving to be a performance nightmare. Is there an alternate method that I can use to avoid cursor and make it more efficient?
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Feb 5, 2015
Without giving dbowner how can we grant permission to user to alter/create procs?
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Jul 22, 2015
I have a procedure where Login and Password of the database are to be used and right now i have given a valid hardcoded value for them.
How can I get these values from the actual login (I mean sql server authentication value or windows authentication).
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Mar 18, 2014
I am a SysAdmin on a test/dev SQL instance. Other non-sysadmin users (developers) need the ability to execute DBCC commands like the following:
DBCC FREESYSTEMCACHE ('ALL') WITH MARK_IN_USE_FOR_REMOVAL
OR
DBCC FREEPROCCACHE
I tried creating a store proc in a user database and granting those non-sysadmin users EXECUTE permission on it as so:
CREATE PROC spFreeSystemCache
WITH EXECUTE AS 'sa'
AS
DBCC FREESYSTEMCACHE ('ALL') WITH MARK_IN_USE_FOR_REMOVAL
GO
When I try to create this proc, I get the following error:
Msg 102, Level 15, State 1, Procedure spFreeSystemCache, Line 2
Incorrect syntax near 'sa'.
Ok, so I can't EXECUTE AS sa...
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Jul 10, 2014
I have a situation where I need to call a stored procedure once per each row of table (with some of the columns of each row was its parameters). I was wondering how I can do this without having to use cursors.
Here are my simulated procs...
Main Stored Procedure: This will be called once per each row of some table.
-- All this proc does is, prints out the list of parameters that are passed to it.
CREATE PROCEDURE dbo.MyMainStoredProc (
@IDINT,
@NameVARCHAR (200),
@SessionIDINT
)
AS
BEGIN
[Code] ....
Here is a sample call to the out proc...
EXEC dbo.MyOuterStoredProc @SessionID = 123
In my code above for "MyOuterStoredProc", I managed to avoid using cursors and was able to frame a string that contains myltiple EXEC statements. At the end of the proc, I am using sp_executesql to run this string (of multipl sp calls). However, it has a limitation in terms of string length for NVARCHAR. Besides, I am not very sure if this is an efficient way...just managed to hack something to make it work.
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Jan 30, 2015
At one of our client side a wired log shipping issues has come up.while monitoring those two server i noticed that although log-shipping report says both server are in sync, report displays information related to both backup and restore , it doesn't shows information related to copy that is when was last file copied and last file copy column is showed blank. Same is when i execute proc "sp_help_log_shipping_monitor" . I get same result ...
When i expand copy job history to analyse its what i found is although job has executed successfully , but in depth reading each steps says that no .trn file was copied .
My copy directory is at secondary server itself where .trn files are placed.And from this location itself files are begin restored.
SQL server and agent on both servers are run by same domain account ....
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Sep 2, 2015
I need to use the same SQL source code in more than one stored proc.
Is there a way to -include mysql.sql or something like that ?
Is InsertSnippet the only way to do this ?
,CASE WHEN P.PROD_CTG = 'Core' AND LEFT(C.SALESFORCE_LEAD_ID,3) = '00Q' THEN S.MSL_QUANTITY ELSE 0 END AS CoreTotal
,CASE WHEN P.PROD_CTG = 'Core' AND LEFT(C.SALESFORCE_LEAD_ID,3) = '00Q' AND LEFT(S.OPPS_RECORD_TP_NM,5)!='Upsel' THEN S.MSL_QUANTITY ELSE 0 END AS CoreSales
,CASE WHEN P.PROD_CTG = 'Core' AND LEFT(C.SALESFORCE_LEAD_ID,3) = '00Q' AND LEFT(S.OPPS_RECORD_TP_NM,5)='Upsel' THEN S.MSL_QUANTITY ELSE 0 END AS CoreUpsell
,CASE WHEN P.PROD_CTG != 'Core' AND LEFT(C.SALESFORCE_LEAD_ID,3) = '00Q' THEN S.MSL_QUANTITY ELSE 0 END AS NonCoreTotal
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Jul 3, 2015
I have a stored proc that is executing in 2 sec on production and test database. It is taking more than a min on dev environment.
I have verified sqlserver version is same on both of the server.Prod is running on 2012Sp1 however dev don't have sp1. I am downloading it.
Both are 64bit, has same collation and compatibility level.I have confirmed that sp on both servers has same execution plan. I have reset and import stats from prod too.
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Apr 7, 2015
A project I'm working on consists of a Main stored procedure which then runs about 30 nested procedures. The client wants to know when a certain nested SP fails, but wihtout rollbacks, as they may want to fix a data item manually (such as a missing Patient ID, that they have to call someone about). At this point, we don't want to roll back anything but halt the rest of the nested SP's and send out an email to someone that they have to check out a missing PatientID.
I'm wondering if an SSIS package would handle this better than just using a Stored Procedure. When that SP runs, it will also update a "Process tracking" table in the backend, that would update [Lastprocessran] with a number. I'm thinking that if they run the main SP again, after making a manual correction, that they could re-run the main SP, and it would bypass any step that already ran successfully based upon the [Lastprocessrun] number.
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Feb 11, 2015
I have a multiselect checkbox list in my UI. I pass the list items to my stored proc as comma separated parameter and then I have a function which converts this parameter to a table with separate rows.
E.g. : a,b,c,d
Converted to result table
result
a
b
c
d
I want to insert each row of the result table into another table. How to do that.
E.g., the table after the function is :
CREATE TABLE #result
(
Subject varchar(100)
)
insert into #result values ('a')
insert into #result values ('b')
insert into #result values ('c')
insert into #result values ('d')
So the pseudo code is something like
for each row in #result
insert row into another table
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Mar 13, 2003
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.
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Jun 15, 2006
Hi All,Quick question, I have always heard it best practice to check for exist, ifso, drop, then create the proc. I just wanted to know why that's a bestpractice. I am trying to put that theory in place at my work, but they areasking for a good reason to do this before actually implementing. All Icould think of was that so when you're creating a proc you won't get anerror if the procedure already exists, but doesn't it also have to do withCompilation and perhaps Execution. Does anyone have a good argument fordoing stored procs this way? All feedback is appreciated.TIA,~CK
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