Can anyone tell me a good way to monitor which indexes are not being used? Over time, I'm sure there are extraneous indexes in our database, which I would like to get rid of.
Any ideas would be appreciated.
Thanks,
Rob
I'm trying to establish the mb usage of a series of nonclustered indexes, I'm used to using the manage indexes GUI in 6.5, and showcontig doesn't quite give me what I want, any suggestions?
View 2 Replies View RelatedI want to create a lot of index for my database for performance.
But I need find memory usage by indexes.
How to find memory usage by index in sql server?
There are too many indexes built on DB. As per the naming convention it seems the indexes are built as per the suggestions provided from execution plan. I presume most of the indexes are used only once in a month for the reports but are hampering the performance of daily running queries. These are also occupying a lot of space.
To confirm on this I have used the below query to know & identify the unused indexes. I have recorded the counters before and after the huge operations and I observed NO CHANGE in any of the values.
What the below values exactly indicate and when do they change? Is it good to delete the indexes having low USER_SEEKS, USER_SCANS, USER_LOOKUPS?
Query:
SELECT OBJECT_NAME(S.[OBJECT_ID]) AS [OBJECT NAME],
I.[NAME] AS [INDEX NAME],
USER_SEEKS,
USER_SCANS,
USER_LOOKUPS,
[Code] .....
How to find if there is a query that can be written on DMV's which will be able to retrieve the indexes that are not being used in a table.
View 2 Replies View RelatedI am working with one of the production database around 200 GB. This database has above 350 tables and more than 500 Indexes. I am feeling the database has so many Indexes than the required ones
When I run the below query, it gives me some indexes read value "0". The server was restarted a month ago.Is it ok to remove those indexes?
SELECT OBJECT_NAME(s.[object_id]) AS [Table Name] ,
i.name AS [Index Name] ,
i.index_id ,
user_updates AS [Total Writes] ,
user_seeks + user_scans + user_lookups AS [Total Reads] ,
user_updates - ( user_seeks + user_scans + user_lookups )
AS [Difference]
[code]....
i want to create a lot of index for my database for performance.but i need find memory usage by indexes.
How to find memory usage by index in sql server?
We have transaction replication set up on one of our servers whose replicated DB is used for reporting purpose:
Now, the replicated database "D" of size 350 GB has mainly grown huge as compared to Published DB (200 GB) because of the index sizes at subscribed DB. Therefore:
I have found that Database D has one table of data size 15 GB, with rows 8349533 and index size 28 GB the biggest in the database. And adding have total of 109 Non clustered indexes:
On using SP_blitzindex i have found approx 50 NC indexes unused with below usage:
Reads: 0 Writes:273,243 and total size of indexes being 18 GB
Last User Seek
Last User Scan
Last User Lookup all '0'
0 singleton lookups; 0 scans/seeks; 0 deletes; 0 updates;
except for few 3 or 4 where updates are more than 4000.
Is this sufficient enough to delete all the above 49 unused NC indexes? And Can i create Missing index on Subscriber database?
I'm working to improve performance on a database I've inherited, and there are several thousand indexes. I've got a list of ones which should definitely exist within the database, and I'm looking to strip out all the others and start fresh, though this list is still quite large (1000 or so).
Is there a way I can remove all the indexes that are not in my list without too much trouble? I.e. without having to manually go through them all individually. The list is currently in a csv file.
I'm looking to either automate the removal of indexes not in the list, or possibly to generate the Create statements for the indexes on the list and simply remove all indexes and then run these statements.
As an aside, when trying to list all indexes in the database, I've found various scripts to do this, but found they all seem to produce differing results. What is the best script to list all indexes?
Find unused databases in a instance or when last used or accessed?
I'm on SQL SERVER 2008 R2 64bit -enterprize
I need to find when the databse is last accessed.
For a given table:
Data 11.91 MB (37.76%)
Indexes 19.41 MB (61.57%)
Unused 0.21 MB (0.67%)
Total 31.53 MB
# Rows 299474
You can see that the indexes are taking up
more space than data there are a total of four
indexes on the table is shouldn't the data(MB) be
higher than the indexes(MB) ?
Hi all,
I need to drop some of my indexes to keep the size of my DB manageable. I know they're not all being used, but what is the best way to determine how often they are being used? Statistics? I haven't come across any text referring to this so any help is appreciated.
Pete Karhatsu
Does SQL Server store somewhere (in a table that I can query) when last an index was used by any queries?
Or does it store which query plans it's a part of?
Hi all,
When i execute the following query on my database, to see the index usage information,
-------------------------------------------------------------------------------------------
use databasenamego
SELECT OBJECT_NAME(S.[OBJECT_ID]) AS [OBJECT NAME], I.[NAME] AS [INDEX NAME],
USER_SEEKS, USER_SCANS,
USER_LOOKUPS,
USER_UPDATES FROM SYS.DM_DB_INDEX_USAGE_STATS AS S
INNER JOIN SYS.INDEXES AS I ON I.[OBJECT_ID] = S.[OBJECT_ID]
AND I.INDEX_ID = S.INDEX_ID
WHERE OBJECTPROPERTY(S.[OBJECT_ID],'IsUserTable') = 1
-----------------------------------------------------------------------------------------
I see for some indexes, the columsn User_seeks= 0, User_scans = 0 .
Does this mean that, those indexes are not being used .
I wanted to know, what is the best way & best criteria to look for, in order to find whether particular index is being used (or) not.( Probalby,We can use DTA , but i believe , there should some way through DMV's also)
Because by keeping unncessary indexes, performance can be hammered on a table whose size is 170 Gb with 9 Non-clustered indexes , 1 clustered
Need some advice on this.
Thanks..
Somewhere i read..that in SQL Server...usage of Built-in Functions on Columns, makes query optimizer to ignore indexes on that column...!
So lets say we have table EMP with Emp_id and Emp_Name....
Also we have Non-Clustered index on Emp_Name.
So following query would NOT use Non-Clustered index on Emp_Name column.
SELECTLEFT(emp_name, 3) as emp3
FROMdbo.EMP
Is this true? i am using SQL Server 2008.
I am looking for some expert opinions on when is it not appropriate to use a clustered index on a table?
Future guru in the making.
I've got a table with a pk (bigint, no autoincrement) that has a clustered index. Same table has an integer field with a non-unique index on it.
When I do a count(*) on the table, the non-unique index is used (20m rows, 12 secs). When I force the count(*) to use the clustered index, it takes 43 secs. When selecting rows, usually the clustered index is used.
So I'm curious as to why the count(*) uses the non-unique index and the others don't. I've noticed it's faster but, why? Any ideas/considerations?
I am trying to find out CPU utilization from the history using process.%processor time. I am having dual core CPU with 2 numa nodes each having 16 logical cpus bind to it.
how to calculate the CPU utilization using perfmon.I tried to use SQL query which gives CPU history using SQL DMV, but I am unable to get the exact value. Because in between I have used the same querry to capture my CPU usage on the run day, the value on run day and the query which iam tryting to pull out is different. I am using the same query to pull the history data with providing the date.
-- Get CPU Utilization History (SQL Server 2008 and above)
DECLARE @ts BIGINT
SELECT @ts =(SELECT cpu_ticks/(cpu_ticks/ms_ticks)
FROM sys.dm_os_sys_info);
SELECT SQLProcessUtilization AS [SQLServer_Process_CPU_Utilization],
SystemIdle AS [System_Idle_Process],
100 - SystemIdle - SQLProcessUtilization AS [Other_Process_CPU_Utilization],
[code]....
Hello!
Is there any way to determine index usage statistics for a given table?
For examle, I have a table, with three indices. I need to know how many times each index was used. Is it possible?
And second part of question: I need to know, which user overloads my base with their giantic queries. Is there any way to determine, how many system resources each of user's sessions uses?
MS SQL Server 2000 Enterprise Edition.
Thank you!
We're using slowly changing dimensions to control a number of data tables in our system. Each table has five or six business keys, but the indexes of the tables are built so they're as efficient as possible (i.e. the fields with the highest diversity are listed first). How does the SCD wizard determine the order of the business key fields? Is there a way I can view or manipulate the statement the SCD task is using to make sure either (a) the indexes match the statement, or (b) the statement matches the indexes?
View 1 Replies View RelatedHi guys,
My company is currently migrating from Interbase to SQL Server 2005. During the migration we have came across a rather peculiar issue and wondering if anyone can advise.
We have a table.. named "prospect" which holds client information
We have a stored procedure which hangs on the following statement.
DECLARE @surname char(25);
SET @surname='BLAH%';
SELECT *
FROM Prospect
WHERE c_surname LIKE @surname;
The above takes 28 seconds to run. The following statement returns a result inside a second.
SELECT *
FROM Prospect
WHERE c_surname LIKE 'BLAH%';
In Interbase, the original returned the answer within a second too. The schema in both database is the same.
The 1st statement does not use an index! The execution plan is different to the 2nd statement. I am aware I can create an index recommended by the Database Engine Tuning which solves the issue or specify the index to use in the original statement but why does the engine not use the correct index if there is a variable involved? I need to know as we have just started looking at the code.
Thanks,
Kalim
I can use Profiler to see database usage activity. However, in addition to it, is there a good query I can use to see whether user databases are being used (last select, last update, last alter or last delete etc., with date/time stamp)?I am looking for both SQL2000 and SQL2005 as we need to decommission some of the older servers.
View 6 Replies View RelatedI was trying to add an index to a heavily used table which has one other index. When I did I recieve the following error message
Unable to create index 'IX_PATIENT__1'.
ODBC error: [Microsoft][ODBC SQL Server Driver][SQL Server]Cannot create more than 249 nonclustered indices or column statistics on one table.
[Microsoft][ODBC SQL Server Driver][SQL Server]Could not create constraint. See previous errors.
Do I need to wack the statistical
Hi
I try to find the percentage of fragmentation in the perticular table using the following table. For some tables it is getting the results but for some database tables it is saying the error in qurey even if I use same query. Is there any reason for that. Or is there any other way to find out the fragmentation of table. any help would be fine. Thanks!
SELECT a.index_id, name, avg_fragmentation_in_percent
FROM sys.dm_db_index_physical_stats (DB_ID(), OBJECT_ID(N'schema.tablename),
NULL, NULL, NULL) AS a
JOIN sys.indexes AS b ON a.object_id = b.object_id AND a.index_id = b.index_id;
GO
And is there any way to find out when did index rebuild occurs in perticular index or table. Thank you very much.
I was checking out an indexes property via SQL 2005 Management Studioand it looks like I can move the index to other filegroups via thedrop down.I checked the BOL ALTER INDEX and I didnt see an argument for thisaction. I see stuff about PARTITION, but I think that is for rowpartitioning??I want to move existing indexes from the PRIMARY filegroup to a newfile group just for indexes, which is called INDEXES.Can this be done via ALTER INDEX or some other way?TIARob
View 1 Replies View Related
In SQL Server 2000 one could DBReindex every index that exists in a given database. You can do the same in SQL Server 2005. But how can this be done with the new Alter Index command? It does not allow me to pass in a variable for the object. Any ideas on how to get this done in with Alter Index in 2005? Thanks!
This I can't get to work:
DECLARE
@TableName nvarchar(100)
SET @TableName = 'Account'
USE database;
GO
ALTER INDEX ALL ON @TableName
REBUILD
GO
USE RZTQ5OL02
DECLARE @TableName varchar(255)
DECLARE TableCursor CURSOR FOR
SELECT Name from sys.sysobjects where type = 'U'
OPEN TableCursor
FETCH NEXT FROM TableCursor INTO @TableName
WHILE @@FETCH_STATUS = 0
BEGIN
DBCC DBREINDEX(@TableName,' ',90)
FETCH NEXT FROM TableCursor INTO @TableName
END
CLOSE TableCursor
DEALLOCATE TableCursor
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 have a database where records are Inserted by an external process.
There is no updating or deleting of the data once inserted. The table in
question has a Clustered Index on the Machine_ID (integer) (data is from
manufacturing processes). Each record bears a start and end time. Most
queries involve the Machine, a time span (start time between to points in
time), the Downtime Cause, and the Running Mode.
I want to add an index on the Start Time, the Downtime Cause, and the
Runtime Mode.
My question is: should this new index also contain the Machine_id column
or does the existence of the Clustered Index already on that column negate
its need in the new index?
RC - Dedicated to only creating original mistakes!
How do i find indexes of the columns of all the tables of thedatbase...........most importantly in SQL server 2000Thanks a lot
View 3 Replies View RelatedI've been asked to look at using Clustered Columnstore indexes for one of my tables. The table contains about 5 million records with about 50 columns. The max field size is a NVarchar(MAX) with max field length currently of about 4k characters. It's only about a gigabyte's worth of data. The table is about 50% R/W operations. Currently, we have multiple indexes with no clustered index due to some performance issues that happened in the past. I've been attempting to determine if it's even really worth it to switch over. I feel that the table is still fairly small with minimal columns and don't believe there will be any noticeable improvement over traditional indexing.
View 3 Replies View RelatedI saw this tool for SQL-Server 2000 :
http://www.sql-server-performance.com/index_tuning_wizard_tips.asp
Is there anything similar for SQL-Server 2005 Express ?
Thank you very much for any help!
Regards,
Fabian
my favorit hoster is ASPnix : www.aspnix.com !
Hi,
I need a query to get the index names of particular tables. for eg.. i have some tables like emp_data,emp_job....etc..Now i want to find all indexe names for those tablenames that starts with emp........ Plz help me...
Script they use to generate indexes in SQL 2005.
I have 2 databases on a separate instance. I want to script out all indexes from database1 then execute it on database2.
How to accomplish this task efficiently.