SQL Server 2008 :: Indexes Fragment Really Quickly
May 1, 2015
This application runs on a SQL Server 2008 R2 database.This application receives messages from an integration module. It has a core table: Table-A. Each message is inserted as 1 row into Table-A. Then when it is processed, that row in Table-A is updated.
There are two environments which are both connected to the same integration. So in both environments, Table-A has exactly the same amount of records inserted and updated. In both environments Table-A has around 80 million rows, with an extra 150,000 rows being inserted and then updated every day.Table-A has 8 indexes. For some reason unknown to me, the 8 indexes fragment really quickly in one environment but not in the other.
e.g. In Environment-1 the index fragmentation ranges from 0 - 19% and this environment has not been re-indexed for over 2 months.BUT a reindex was performed in Environment-2 and only 2 days later the index fragmentation ranges from 72 - 99.93%!
Our DBA has confirmed the re-index in Environment-2 completed successfully and has shown stats before and after the reindex to show that the 8 indexes for Table-A in Environment-2 went down to 0% fragmentation.
My question is, how can the indexes in Environment-2 fragment so much more quickly than the indexes in Environment-1? Both environments are on exactly the same hardware and have exactly the same inbound messages. The database on Environment-1 is actually a clone from Environment-2. The only known differences between the 2 databases is Environment-1 is STANDARD edition - SQL Server 2008 R2 (SP2) whereas Environment-2 is ENTERPRISE edition - SQL Server 2008 R2 (SP1). Could this difference be due to the Service Pack levels or even because one is STANDARD and the other ENTERPRISE?
This is what I have checked so far:
1) In both Environments all 8 indexes have "Set Fill Factor" unchecked and "Automatically recompute statistics", "Use row locks...", "Use page locks..." checked.
2) The "Index Usage Statistics" report in both Environments shows a similar amount of #UserUpdates and #UserScans
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Apr 8, 2015
I just did index defragmentation for some databases include MSDB . I notice there are 3 indexes from MSDB database that fragmented quickly ( I did rebuild last nite at 10 PM - > fragmentation level becomes zero but today at 9 am it become 80 % ).The indexes are backupsetuuid, backup media family uuid, backupmediasetuuid. I am thinking to set the fill factor for those indexes = 80 respectively.
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Jun 25, 2015
I have a requirement to only rebuild the Clustered Indexes in the table ignoring the non clustered indexes as those are taken care of by the Clustered indexes.
In order to do that, I have taken the records based on the fragmentation %.
But unable to come up with a logic to only consider rebuilding the clustered indexes in the table.
create table #fragmentation
(
FragIndexId BigInt Identity(1,1),
--IDENTITY(int, 1, 1) AS FragIndexId,
DBNAME nvarchar(4000),
TableName nvarchar(4000),
[Code] ....
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May 21, 2015
I 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]....
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Jun 16, 2015
We have a maintenance plan that reorganize all indexes in a database. We disabled one of the index on one table this job failed. How to set up to the maintenance plan to without failing to ignore the reorganizing of disabled indexes?
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Jul 15, 2015
When creating the snapshot I didn't choose the option copy non-clustered indexes. I created some indexes manually on subscriber database. Replication failed later with some issue.
so reinitialized with new snapshot but all the indexes are gone from the subscriber database.
How to keep the indexes without dropping from subscriber database whenever we reinitialized with snapshot
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Apr 6, 2015
I written a proc to display the list of Indexes But I needed to print the database where the objects do belong to. How I should write the Dynamic script to add the database Id? I thought to use derived table kind of stuff, but unable to find a solution.
ALTER PROC [dbo].[USP_INDEXCHECK]
AS
DECLARE @sql NVARCHAR(max)
DECLARE @DB VARCHAR(max)
DECLARE databasecursor CURSOR FOR
[Code] .....
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Nov 5, 2015
If I rebuild some indexes that are above 30% of average fragmentation, should I after that update statistics?
Also, How can I see if I Need to update statistics^on the tables of my database?
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May 25, 2015
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.
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Aug 24, 2007
Will someone please help verify this SQL fragment?
I want to ensure that it produces the same results as the 'Group By' clause of the MS Access fragment below.
T-SQL:
Group By Case
When r.LICFAC In ('CR', 'GC') And f.SOPNO < 38 Then -1
Else 0
End
, Case
When r.LICFAC = 'MU' And f.SOSTS <> '05' Then -1
Else 0
End
MS Access:
GROUP BY IIf((([LICFAC]="CR" Or [LICFAC]="GC") And ([SOPNO]<38)),True,False)
, IIf(([LICFAC]="MU") And ([SOSTS]<>"05"),True,False)
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Mar 20, 2015
how to fragment an index so I can test it's fragmented performance on an iSCSI LUN.I can test without an index, that's fine. I can test with a newly created index (of course that means it's not fragmented) and that's fine.But what I want to do is DELIBERATELY FRAGMENT () an index to 90%+ fragmented to test it's performance.
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Nov 13, 2000
Good morning one and all,
I need to transfer a database (contining one table) containing over 35 million records from one server to another. I have two options at present :
(a) Use DTS to do the transfer
(b) Copy the mdf file across and sp_attach_db it
Does any1 have a better idea, or does any1 know which of the two methods will be the quickest?
TIA
Gurmi
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Mar 28, 2015
Our system runs a SQL Server 2012 DB, it has a table (table_a) which has over 10M records. Our system have to receive data file from previous system daily which contains approximate 3M updated or new records for table_a. My job is to update table_a with the new data.
The initial solution is:
1 Create a table (table_b) which structur is as the same as table_a
2 Use BCP to import updated records into table_b
3 Remove outdated data in table_a:
delete from table_a inner join table_b on table_a.key_fileds = table_b.key_fields
4 Append updated or new data into table_a:
insert into table_a select * from table_b
As the test result, this solution is very inefficient. Step 3 costs several hours, e.g. How can I improve it?
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I have a database with a couple of tables i need to expand to 4 gigabytes in order to run some tests. (currently 300 megs)
Does anyone have a script or some method that would quickly populate my tables with random data so that i can grow my database to the desired size for testing.
Thanks
I have SQL server 2005 express. I have the management studio installed too.
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Mar 20, 2007
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We started the configuration at 13:00 today, its now 18:00 and it has done 25% ... is that normal?
Its 8 disks (so 4 mirror-pairs), it will have around 300GB of usable space when its done.
What would happen if we needed to do this in a time critical window? (for this debacle we have moved the database onto the Web Server, so we can survive for a few more hours ...)
Kristen
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Jun 15, 2007
Hi, All:
I know oracle SQL, now I need to do a lot of SQL query on Microsoft SQLSERVER, can any one point out any place that I can find out the syntax of SQLserver SQL statement? Since this is just a short term assignment, so I don't want to buy a book, just hoping I can learn something quickly from online. I don't need learn anything deep, just need to know some simple syntax so I can do join, count, concatenate, min(), max(), sum () etc.
thanks in advance.
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Oct 22, 2007
I am trying to search for stored files "for example from date: 15/12/2003 to: 24/6/2006" and when i press search no results appeare the following is the database code:
1 public DataTable searchData(string fileNo, string Title, string dFrom, string dTo, string brief)2 {3 string str = "";4 5 str = "select * from Tb_File where Active = 1 ";6 7 if (fileNo != "")8 str += " and FileNo='" + fileNo + "'";9 if (Title != "")10 str += " and Title like '%" + Title + "%' ";11 if (brief != "")12 str += " and Brief like '%" + brief + "%' ";13 if (dFrom != "")14 str += " and DFrom >= convert(datetime,'" + Convert.ToDateTime(dFrom).ToShortDateString() + "',103) ";15 if (dTo != "")16 str += " and DTo < convert(datetime,'" + Convert.ToDateTime(dTo).ToShortDateString() + "',103) ";17 18 ole.Open();19 SqlDataAdapter DA = new SqlDataAdapter(str, ole);20 DataTable DT = new DataTable();21 DA.Fill(DT);22 ole.Close();23 return DT;24 25 }
i am using sql 2000, with Visual Studio 2005.
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Mar 26, 2007
Good day,
I have a table of approximately 10 million rows. The table has 3 field making up the key, namely:
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I need to extract all the distinct Program's from the table.
I have don so with:
Select distinct Program from table
This unfortunately takes roughly 2 minutes which is far to long. Is there something I can do to help speed this process up?
Thanks in advance.
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May 19, 2004
There have been several threads about changing a database's collation but none have come up with an easy answer before.
The suggestion before was to create an empty database with the correct collation and then copy the data across.
However this is hard work as you have to populate tables in a specific order in order not to violate foreign keys etc. You can't just dts the whole data.
There follows scripts we have written to do the job. If people use them, please could you add to this thread whether they worked successfully or not.
Firstly we change the default collation, then change all the types in the database to match the new collation.
===================
--script to change database collation - James Agnini
--
--Replace <DATABASE> with the database name
--Replace <COLLATION> with the collation, eg SQL_Latin1_General_CP1_CI_AS
--
--After running this script, run the script to rebuild all indexes
ALTER DATABASE <DATABASE> COLLATE <COLLATION>
exec sp_configure 'allow updates',1
go
reconfigure with override
go
update syscolumns
set collationid = (select top 1 collationid from systypes where systypes.xtype=syscolumns.xtype)
where collationid <> (select top 1 collationid from systypes where systypes.xtype=syscolumns.xtype)
go
exec sp_configure 'allow updates',0
go
reconfigure with override
go
===================
As we have directly edited system tables, we need to run a script to rebuild all the indexes. Otherwise you will get strange results like comparing strings in different table not working.
The indexes have to actually be dropped and recreated in separate statements.
You can't use DBCC DBREINDEX or create index with the DROP_EXISTING option as they won't do anything(thanks to SQL Server "optimization").
This script loops through the tables and then loops through the indexes and unique constraints in separate sections. It gets the index information and drops and re-creates it.
(The script could probably be tidied up with the duplicate code put into a stored procedure).
====================
--Script to rebuild all table indexes, Version 0.1, May 2004 - James Agnini
--
--Database backups should be made before running any set of scripts that update databases.
--All users should be out of the database before running this script
print 'Rebuilding indexes for all tables:'
go
DECLARE @Table_Name varchar(128)
declare @Index_Name varchar(128)
declare @IndexId int
declare @IndexKey int
DECLARE Table_Cursor CURSOR FOR
select TABLE_NAME from INFORMATION_SCHEMA.tables where table_type != 'VIEW'
OPEN Table_Cursor
FETCH NEXT FROM Table_Cursor
INTO @Table_Name
--loop through tables
WHILE @@FETCH_STATUS = 0
BEGIN
print ''
print @Table_Name
DECLARE Index_Cursor CURSOR FOR
select indid, name from sysindexes
where id = OBJECT_ID(@Table_Name) and indid > 0 and indid < 255 and (status & 64)=0 and
not exists(Select top 1 NULL from INFORMATION_SCHEMA.TABLE_CONSTRAINTS
where TABLE_NAME = @Table_Name AND (CONSTRAINT_TYPE = 'PRIMARY KEY' or CONSTRAINT_TYPE = 'UNIQUE') and
CONSTRAINT_NAME = name)
order by indid
OPEN Index_Cursor
FETCH NEXT FROM Index_Cursor
INTO @IndexId, @Index_Name
--loop through indexes
WHILE @@FETCH_STATUS = 0
begin
declare @SQL_String varchar(256)
set @SQL_String = 'drop index '
set @SQL_String = @SQL_String + @Table_Name + '.' + @Index_Name
set @SQL_String = @SQL_String + ';create '
if( (select INDEXPROPERTY ( OBJECT_ID(@Table_Name) , @Index_Name , 'IsUnique')) =1)
set @SQL_String = @SQL_String + 'unique '
if( (select INDEXPROPERTY ( OBJECT_ID(@Table_Name) , @Index_Name , 'IsClustered')) =1)
set @SQL_String = @SQL_String + 'clustered '
set @SQL_String = @SQL_String + 'index '
set @SQL_String = @SQL_String + @Index_Name
set @SQL_String = @SQL_String + ' on '
set @SQL_String = @SQL_String + @Table_Name
set @SQL_String = @SQL_String + '('
--form column list
SET @IndexKey = 1
-- Loop through index columns, INDEX_COL can be from 1 to 16.
WHILE @IndexKey <= 16 and INDEX_COL(@Table_Name, @IndexId, @IndexKey)
IS NOT NULL
BEGIN
IF @IndexKey != 1
set @SQL_String = @SQL_String + ','
set @SQL_String = @SQL_String + index_col(@Table_Name, @IndexId, @IndexKey)
SET @IndexKey = @IndexKey + 1
END
set @SQL_String = @SQL_String + ')'
print @SQL_String
EXEC (@SQL_String)
FETCH NEXT FROM Index_Cursor
INTO @IndexId, @Index_Name
end
CLOSE Index_Cursor
DEALLOCATE Index_Cursor
--loop through unique constraints
DECLARE Contraint_Cursor CURSOR FOR
select indid, name from sysindexes
where id = OBJECT_ID(@Table_Name) and indid > 0 and indid < 255 and (status & 64)=0 and
exists(Select top 1 NULL from INFORMATION_SCHEMA.TABLE_CONSTRAINTS
where TABLE_NAME = @Table_Name AND CONSTRAINT_TYPE = 'UNIQUE' and CONSTRAINT_NAME = name)
order by indid
OPEN Contraint_Cursor
FETCH NEXT FROM Contraint_Cursor
INTO @IndexId, @Index_Name
--loop through indexes
WHILE @@FETCH_STATUS = 0
begin
set @SQL_String = 'alter table '
set @SQL_String = @SQL_String + @Table_Name
set @SQL_String = @SQL_String + ' drop constraint '
set @SQL_String = @SQL_String + @Index_Name
set @SQL_String = @SQL_String + '; alter table '
set @SQL_String = @SQL_String + @Table_Name
set @SQL_String = @SQL_String + ' WITH NOCHECK add constraint '
set @SQL_String = @SQL_String + @Index_Name
set @SQL_String = @SQL_String + ' unique '
if( (select INDEXPROPERTY ( OBJECT_ID(@Table_Name) , @Index_Name , 'IsClustered')) =1)
set @SQL_String = @SQL_String + 'clustered '
set @SQL_String = @SQL_String + '('
--form column list
SET @IndexKey = 1
-- Loop through index columns, INDEX_COL can be from 1 to 16.
WHILE @IndexKey <= 16 and INDEX_COL(@Table_Name, @IndexId, @IndexKey)
IS NOT NULL
BEGIN
IF @IndexKey != 1
set @SQL_String = @SQL_String + ','
set @SQL_String = @SQL_String + index_col(@Table_Name, @IndexId, @IndexKey)
SET @IndexKey = @IndexKey + 1
END
set @SQL_String = @SQL_String + ')'
print @SQL_String
EXEC (@SQL_String)
FETCH NEXT FROM Contraint_Cursor
INTO @IndexId, @Index_Name
end
CLOSE Contraint_Cursor
DEALLOCATE Contraint_Cursor
FETCH NEXT FROM Table_Cursor
INTO @Table_Name
end
CLOSE Table_Cursor
DEALLOCATE Table_Cursor
print ''
print 'Finished, Please check output for errors.'
====================
Any comments are very welcome.
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Mar 6, 2008
I am very new to SSIS. Can someone give me a basic out line to this problem. I kind of understand control tasks, data flow, etc... but not in details(watched couple of webcasts). I need to see something like below in action to understand this better.
Basically, I need to process a flat csv file on daily basis and load it into a table. As I am loading the records, I will need to verify(on a key column) to see if record exists in table already. If so then just update the record otherwise insert a new record. When I find a record, I need to possibly do a checksum on a set of columns before I do update. So, only update if these set of columns are different from file vs. table. I also need to keep performance in mind as I am processing this record one at a time looking up this record. I am thinking this should be fairly easy but I am getting little lost in control tasks and dataflow as to what goes on what. By the way I am using visual studio 2005 and sqlserver 2005.
I would appreciate your help. thanks again. I dont mind an example solution file.
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Jul 10, 2007
I have five small tables that I need to insert to a SQL CE database.
I am using the 2.0 Compact Framework with the 2.0 System.Data.SqlServerCe.
My table definition is dynamic so I never know it's design.
1- If I go Row by Row using an this.ExecuteNonQuery(_global, par); it takes about 26 seconds to insert 5 tables of 330 rows.
2- If a use
StringBuilder sbColumns = new StringBuilder();
foreach (DataColumn dc in table.Columns)
{
if (sbColumns.ToString() != "")
sbColumns.Append(",");
sbColumns.Append(dc.ColumnName);
}
SqlCeDataAdapter da = new SqlCeDataAdapter("SELECT " + sbColumns.ToString() + " FROM " + _tablename, m_con);
SqlCeCommandBuilder cb = new SqlCeCommandBuilder(da);
da.MissingMappingAction = MissingMappingAction.Passthrough;
da.InsertCommand = cb.GetInsertCommand();
da.Update(table);
da.Dispose();
it takes about 46 seconds.
How Can write it faster or is this fastest it can go?
Thanks
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Dec 15, 2006
We have a system that has 35 million conversations piled up. We didn't know to explicitly end the conversation once the processing has completed. Oops. Now, our production box has 35 mm sitting in the table, and we have run into the problem where the amount in sys.conversation_endpoints has exceeded memory and they are being dumped into tempdb, which is killing our disk space, thus bringing the box down. We have fixed the code to end the conversations, but we now have to end the conversations in a hurry. If we select one by one out of the table and end the conversation via END CONVERSATION, it is slow. Very slow. It will finish in a few months. :(
Does anyone know how to get rid of these conversations in a hurry? All of the messages have been applied to our system, so killing the conversations will (should) have no affect on the processed data. Something like a TRUNCATE statement?
Thank you so much in advance,
John Hennesey
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Apr 28, 2008
I am using SQL server to create a rather complicated client database for a nonprofit organization. I have access to an ancient version of the database in Access format, but would rather create a new database from scratch instead of "up-sizing" the old database. Although the old database is mostly useless, it contains a goldmine of names and addresses that I could use to populate the new database that I'm creating. My question is this: Is there any relatively easy way to cut and paste from external data sources into a new SQL database? For example, I would love to just select twenty rows of "first names" from the old database and then paste that into my new table. Can anyone suggest any quick and easy tricks for populating a new database with place-holder content? Thanks!
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Mar 9, 2015
I have a table with hundreds of millions of records and need to update an xml column to null. I do something like this:
UPDATE [Mydb].[MySchema].[MyTable]
SET [XMLColumn] = null
Currently it is taking around 6 hours.
Is there a quicker way to do this?
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Jul 1, 2014
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?
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Mar 31, 2008
There are a few features in the new SQL Server - Reporting Services that I really need in production. I have tested everything and it works great. I am running the CTP version since Microsoft is saying they aren't releasing the release version until 3rd quarter 2008.
Since Microsoft won't sell SQL 2008 until 3rd quarter, can I run the CTP in production until the release and then purchase SQL 2008?
Jim
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Apr 23, 2008
Hello - does anyone have experience w/SQL Server 2005 in a virtual environment? I'm considering this for a production environment but not sure if performance will suffer. Our databases will have a lot of writing but not too much reading. A SSRS solution is currently the only app. connecting to the SQL db. Max users to server at any given time will be very low (~10 users max). But the databases are pulling in data from other, outside multiple data sources on a daily basis.
Any pointers to documentation or any advice?
Thanks,
A Brown
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Feb 25, 2008
Hello!
Recently, I set up server with Windows Web Server 2008 RC1, SQL 2008 Express beta, .NET 3.5, IIS 7.
I'm running ASP.NET web application with SQL database. Everything works fine until the first application state on the server expires. After that, any postback that starts a new application state on the server and connects to the database, results in the following error:
Failed to generate a user instance of SQL Server due to a failure in starting the process for the user instance. The connection will be closed.
Is this a bug that will be fixed in release of Windows / SQL or am I doing something wrong?
Many thanks for help,
Jan
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Mar 7, 2008
Hi all,
New to this so please be patient and please help.
I have developed an SQL 2005 Express command line option install for our company which has been working seamlessly for the last 18 months.
http://msdn2.microsoft.com/en-us/library/ms144259.aspx
I downloaded the €œMicrosoft SQL Server 2008 Express CTP, February 2008€? from http://www.microsoft.com/downloads/details.aspx?FamilyId=749BD760-F404-4D45-9AC0-D7F1B3ED1053&displaylang=en
I simply replaced the 2005 file €œSQLEXPR.EXE€? with the 2008 file €œ€?, recompiled the installation and tested only for it to fail. I than read the 2008 books online and noted the change in command line options.
http://www.microsoft.com/downloads/details.aspx?familyid=19DB0B42-A5B2-456F-9C5C-F295CDD58D7A&displaylang=en
http://msdn2.microsoft.com/en-us/library/ms144259(SQL.100).aspx
I then changed the command line to suit the Microsoft 2008 books online, recompiled the installation and tested only for it to fail once more.
Interestingly I tested the install from the default GUI and at the point of adding the €œsa€? login credentials it fails to allow the installation to proceed. Strangely by selecting the windows authentication credentials, €œnext€? than €œback€? it now allows me to add the €œsa€? login credentials and continues to install correctly as required.
I hope I have explained this clearly enough.
1. Is this a bug in the €œMicrosoft SQL Server 2008 CTP, February 2008€? installation?
2. If so is this causing the command line install options to fail?
3. How do I obtain a version of €œMicrosoft SQL Server 2008 Express€? that will work installing from the command line?
Thanks in advance.
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Nov 10, 1999
I have been given a SQL server database to look after (a steep learning curve).
A large (4.5 gigabyte) table has two indexes:
One is Surname and another is Surname and PostCode. Neither of the indexes are unique or clustered.
Is there any reason for supporting these two indexes which are 71Mb and 101Mb respectively?
I would appreciate any advice on why these two indexes may exist.
Thanks
jonathan
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Mar 23, 2007
I am tasked with maintaining a large database still on SQL Server 7.0.Performance is an issue not surprisingly and I've targeted two ratherlarge tables to see what I can do with the indexes.The 2 tables are described as follows:MatterConflicts:Fields: MatterConflicts varchar(16), Matters varchar(16), HitMattersvarchar(16), IsInclude varchar(1)Index: MatterConflictsMatterConflictHits:Fields: MatterConflictHits varchar(16), MatterConflicts varchar(16),ColumnLabel varchar(40), Hit varchar(100)Index: MatterConflictHitsNow MatterConflicts row count is approaching 500K andMatterConflictHits is approaching 1 Million rows. There are only oneindex on each table, each for the table's primary key. The Mattersfield in MatterConflicts table joins back with a table that usersaccess directly.Question is, would it be beneficial to add, or modify the existingindexes for these tables to include both the primary and foreign keys,as well as an additional field?Doesn't seem to be to be very beneficial to have an index that onlyincludes the primary key. So for example I'm thinking of creating anindex for MatterConflicts that includes the fields: MatterConflicts,Matters, and HitMatters.Thoughts? Suggestions? Thanks...
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Mar 2, 2000
Hi
Has anyone heard of MS SQL Server 7 dropping indexes?
I had created an index on a table. The next day
the index had disappeared. Has anyone expirienced such
a problem?
Thanks in advance
Winston
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Apr 9, 2008
What is Indexes in SQL Server? Where we use ?? How to use?
I need little explanation about this topic with any sample code.
Thanks in advance.
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