Reorganizing Indexes
Jun 13, 2007Rebuilding Indexes automatically updates statistics.
But does Reorganizing Indexes also update statistics?
Regards
Paresh Motiwala
Boston, USA
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SQL Server 2008 :: Reorganizing All Failed - Disabled Indexes
Jun 16, 2015We 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?
View 1 Replies View RelatedSQL 2012 :: Reorganizing Full Text Catalogs
Feb 25, 2014I have a handful of databases that are enabled for Full-Text search. After investigating some recent performance issues, I discovered the FullText Catalogs needed to be reorganized. This is a task I knew I wanted to automate, without having to hard-code db names or catalog names. My first thought was to use sp_executesql with dynamic tsql strings. I was quite disappointed to realize that I couldn't use fully qualified names to run either of these commands:
ALTER FULLTEXT CATALOG [DBName].[SchemaName].[CatalogName] REORGANIZE
ALTER FULLTEXT CATALOG [DBName]..[CatalogName] REORGANIZE
My next thought was to create a stored proc on each user db that would do the re-orgs. Then I could have a sql job iterate through the db's and run the sp on each db. Thinking...Hmm...That's do-able, but I don't like it. Add a new db to the server, and I have to remember to create the sp. Relying on my memory to do something isn't always a good idea. Plus, if I have to fix/edit/enhance the sp, I get the pleasure of doing it multiple times on multiple servers. Too much work.
I came up with some code that would dynamically reorganize all the catalogs, but I had to run it while connected to a specific db. How do I run the code while connected to [master], but in the context of a different db? The undocumented proc [sp_MSforeachdb] came to mind. I'd never used it, and was reluctant to do so after reading about other dba's experiences with it. So I came up with my own derivitive, just for this one purpose. The code is below.
CREATE PROCEDURE dba.ReorganizeFullTextCatalogs
AS
/*
Purpose:
Reorganizes the FullText Catalogs (as needed) on all user databases.
Inputs: None
History:
02/25/2014DMasonCreated
*/
--This is the tsql statement that get executed on each db.
DECLARE @InnerSql NVARCHAR(MAX) =
'DECLARE @Tsql NVARCHAR(MAX)
[Code] ......
SQL 2012 :: Reorganizing Full Text Catalog?
Sep 10, 2014I am in a dilemma if I should reorganize or rebuild a full text catalog.
My application owner does not want a rebuild as he says that it takes week for the rebuild to occur on these full text indexes.
Will this code just re-organize without turning off the full text indexes : Alter fulltext catalog catalog_name Reorganize
Reorganizing/Rebuilding Index Results In More Fragmentation?
Dec 11, 2007I have been reworking my index maintenance jobs from my old SQL 2000 table and view references to the DMV's and System Tables in SQL 2005, and I noted that some of my indexes end up being more fragmented after a reorganization and or rebuild. That doesn't make much sense to me at all. The code I am executing is:
Code Block
print ' '
print '************* Beginning Index Updates for '+db_name()+' *************'
print ' '
DECLARE @tablename varchar(250),
@indexname varchar(250),
@fragpcnt decimal(18,1),
@indexid int,
@dbID int
-- Determine DB ID
SELECT @dbID = DB_ID()
DECLARE tnames_cursor CURSOR FOR
SELECT b.name, c.name, a.avg_fragmentation_in_percent, a.index_id
FROM sys.dm_db_index_physical_stats (@dbID, NULL, NULL, NULL, NULL) a
JOIN sys.indexes b ON a.object_id = b.object_id
AND a.index_id = b.index_id
JOIN Sys.objects c ON b.object_id = c.object_id
WHERE a.index_id > 0
ORDER by a.page_count DESC
OPEN tnames_cursor
FETCH NEXT FROM tnames_cursor INTO @indexname, @tablename, @fragpcnt, @indexid
WHILE (@@fetch_status = 0)
BEGIN
-- Declare and determine the tablename ID
declare @tablenameID int
select @tablenameID = object_id(@tablename)
IF @fragpcnt > 30
BEGIN
EXEC('ALTER INDEX ['+@indexname+'] ON ['+@tablename+'] REBUILD')
PRINT '***************************************************'
PRINT 'Index '+@indexname+' was rebuilt.'
PRINT 'Original framentation Percent: ' + convert(varchar, @fragpcnt) + '%'
SELECT @fragpcnt = avg_fragmentation_in_percent
FROM sys.dm_db_index_physical_stats (@dbID, @tablenameID, @indexid, NULL, NULL) a
JOIN sys.indexes b ON a.object_id = b.object_id
AND a.index_id = b.index_id
JOIN Sys.objects c ON b.object_id = c.object_id
PRINT 'Post Rebuild fragmentation Percent: ' + convert(varchar, @fragpcnt) + '%'
PRINT ''
END
ELSE IF @fragpcnt BETWEEN 5 AND 30
BEGIN
EXEC('ALTER INDEX ['+@indexname+'] ON ['+@tablename+'] REORGANIZE')
PRINT '***************************************************'
PRINT 'Index '+@indexname+' was Reorganized.'
PRINT 'Original framentation Percent: ' + convert(varchar, @fragpcnt) + '%'
SELECT @fragpcnt = avg_fragmentation_in_percent
FROM sys.dm_db_index_physical_stats (@dbID, @tablenameID, @indexid, NULL, NULL) a
JOIN sys.indexes b ON a.object_id = b.object_id
AND a.index_id = b.index_id
JOIN Sys.objects c ON b.object_id = c.object_id
PRINT 'Post Reorganization fragmentation Percent: ' + convert(varchar, @fragpcnt) + '%'
PRINT ''
END
ELSE
BEGIN
PRINT '***************************************************'
PRINT 'Index '+@indexname+' was left alone.'
PRINT 'Original framentation Percent: ' + convert(varchar, @fragpcnt) + '%'
PRINT ''
END
FETCH NEXT FROM tnames_cursor INTO @indexname, @tablename, @fragpcnt, @indexid
END
print ' '
print '************* NO MORE TABLES TO INDEX *************'
PRINT 'All indexes for the '+db_name()+' database have been updated.'
print ' '
DEALLOCATE tnames_cursor
Below are some snipits of the output:
***************************************************
Index _dta_index_wuci_history_8_1123587141__K2_K5 was rebuilt.
Original framentation Percent: 58.3%
Post Rebuild fragmentation Percent: 58.3%
***************************************************
Index PK__batchjob__776C5C84 was left alone.
Original framentation Percent: 0.0%
***************************************************
Index PK__ContactWebDetail__116A8EFB was rebuilt.
Original framentation Percent: 44.4%
Post Rebuild fragmentation Percent: 77.8%
***************************************************
Index PK__managed_object_s__5DCAEF64 was left alone.
Original framentation Percent: 0.0%
***************************************************
Index kb_IX_kb_scope_scope_role was rebuilt.
Original framentation Percent: 75.0%
Post Rebuild fragmentation Percent: 87.5%
***************************************************
Index PK__query__09A971A2 was left alone.
Original framentation Percent: 0.0%
***************************************************
Index PK__email_message__38996AB5 was rebuilt.
Original framentation Percent: 85.7%
Post Rebuild fragmentation Percent: 0.0%
***************************************************
If the index begins with PK, then it is the primary key index which is generally the clustered index on the table, but not always. If it has an IX on it, it is generally a non-clustered index on the table, but again not always. In the case of the above, the PK is a clustered index, and the IX is a non-clustered index.
Anyone have any ideas why this is functioning in this manner?
Thanks,
Jon
Reorganizing A Large Table 25 Hours And Counting. HELP!
Nov 7, 2007
I'm currently running a reorganize on a large table of ~60 gig. I started the reorganize when I noticed the fragmentation was 97.95%!!!
Well the reorganize has been running for 25 hours now and apparently bulk inserts cannot happen during this time since my SSIS package just bombed trying to prepare for bulk insert.
Anyway, my question is can I cancel this reorg? I didn't start the reorg through the query analyzer. I saw this cute little reorganize button when I right clicked my indexes, properties, fragmentation in the SQL 2005 management studio. I clicked it and then clicked ok.
I know I should have done an alter rebuild but I wasn't comfortable with the process and did the one click solution that is now killing me.
What happens if I go into task manager and shut down the process? Am I risking a serious side effect of corruption or will SQL just stop so I can rebuild the index properly?
SQL 2012 :: Index Reorganizing Is 10 Times Slower Than Rebuild?
Oct 19, 2014why index reorganizing is 10 times slower then rebuild with "ONLINE=ON" clause?
View 9 Replies View RelatedRemoval Of Selected Indexes / Script Index Create For List Of Indexes
Jul 1, 2014I'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?
A Question About Clustered Indexes Forcing Rebuild Of Non-clustered Indexes.
Sep 18, 2007So I'm reading http://www.sql-server-performance.com/tips/clustered_indexes_p2.aspx and I come across this:
When selecting a column to base your clustered index on, try to avoid columns that are frequently updated. Every time that a column used for a clustered index is modified, all of the non-clustered indexes must also be updated, creating additional overhead. [6.5, 7.0, 2000, 2005] Updated 3-5-2004
Does this mean if I have say a table called Item with a clustered index on a column in it called itemaddeddate, and several non-clustered indexes associated with that table, that if a record gets modified and it's itemaddeddate value changes, that ALL my indexes on that table will get rebuilt? Or is it referring to the table structure changing?
If so does this "pseudocode" example also cause this to occur:
sqlstring="select * from item where itemid=12345"
rs.open sqlstring, etc, etc, etc
rs.Fields("ItemName")="My New Item Name"
rs.Fields("ItemPrice")=1.00
rs.Update
Note I didn't explicitly change the value of rs.fields("ItemAddedDate")...does rs.Fields("ItemAddedDate")=rs.Fields("ItemAddedDate") occur implicitly, which would force the rebuild of all the non-clustered indexes?
SQL Server 2008 :: Logic To Rebuild Only Clustered Indexes / Skipping To Rebuild Non Clustered Indexes In Same Table
Jun 25, 2015I 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] ....
Indexes Vs Clustered Indexes
Sep 17, 2006What is the difference please?
View 1 Replies View RelatedIndexes
Jul 31, 2002Sir,
1. How do I call the indexes created in SQL server for a table from Front end VB programming ?
2. How can I use SEEK command with ADODB control ?
Please give me some tips & samples
Sundar Raman
Indexes
Jul 23, 2001Does anyone have the idea why the Indexes with _WA.....(like _WA_Sys_au_fname_07020F21) gets created.I don't how this index got created. I did not create this Index.
My Question is does the system creates these indexes or something else does this.
Thanks
Chak
DB Indexes
Jul 27, 2000Is there a way to tell how many indexes exist for an entire database, all I'm looking is for a count or generating a report list.
any help would be appreciated, thank you
Indexes
Sep 13, 2000At present I have been assigned to create indexes to retrieve the information fast, from the table. The existing table doesn’t have primary key, foreign key and unique constraints but I found to many default indexes already created by the system. I would like to know how this happened? Please inform how to delete these default indexes. Further, inform me other possible ways for the faster retrieval in SQL sever 7.0, if there are any.
I would appreciate if you send me a step by step explanations for the above problems.
Thanks a lot
Indexes Not Being Used
Nov 20, 2000I have run into a snag on my development server. Queries that are selecting data based on indexed fields in a where clause are using the wrong indexes. They are arbitrarily using the clustered index which isn't in the select at all and causing big performance problems. I can run the same statements on my production server and it runs based on the proper indexes. I used query execution plans to determine that this was infact the case.
I run DBCC Checkdb everynight and it comes back with no errors. I also rebuild the indexes. We also don't receive any other errors inputting or updating data. This sounds like corruption to me but if it's something else I don't want to spend the night restoring from production if there is another reason.
Has anyone encountered this before? Any ideas?
Appreciate it, K.
6.5 Indexes
Jan 10, 2001Is there any way for me to find out when last indexes have been used so that the one I don't need can be dropped.And also the one's that are of no use at all.
I need this as i am trying to dump all duplicated indexe . i know i can do this in ver 7
thanks
Indexes
Feb 5, 2000when executed sp_help tablename, I get lot of statistics and indexes like the following. Can anyone please tell me how it is generated automatically. as far i know statistics are generated only for primary keys. Can you please tell me what is clustered , hypothetical and the indexes starting with _WA supposed to be. Also there are lot of duplicate stats. Is it Ok to deletes those.
_WA_Sys_is_platinum_0A9D95DB
_WA_Sys_active_0A9D95DB nonclustered, statistics, auto create located on PRIMARY Active
hind_c_33_15 nonclustered, statistics located on
hind_c_37_1 clustered, hypothetical located
Thanks
Raj
Indexes
Mar 2, 2001Is there a way T-SQL script can find out all indexes built on a set of tables, drop them and periodically ( quarterly as an example ) re-build them ?
Thanks in advance for help.
Ivan
Indexes
Mar 5, 2001How do you find out indexes ( with column names info ) on a table ?
Thanks in advance.
Ivan
Indexes!
Jun 20, 2001I am on SQL 6.5.
I have a question about speed and indexes. I have a static table (no updates except once a year). I want to be able to search data quickly on one column or many columns. I have created nonclustered indexes on each of the columns I search by. Is there anything else I can do to speed up my queries? Unfortunately all the searches involve using the like operator. I have even broken my table down into 2 smaller tables (Table A ~ 3 million rows, Table B 8 million rows).
All suggestions will be appreciated.
Thanks,
Eric
The Indexes
Nov 12, 1998We have to interduce a new naming convention for the indexes currently available in the user databases.
We also have to drop all the old indexes available in about 250 tables and recreate them all acording to the naming convention we are coming up with.
Can any body suggest any idea.
I thank you guys in advance for your considaration.
Indexes
Mar 10, 2006hi.
there 2 different queries
1
[MYSQL].... where Cat=@CatID and Date=@Date[/MYSQL]
2
[MYSQL]... where Cat=@CatID and Date=@Date and Salesman=@SID[/MYSQL]
these queries are often used.
my question is about indexes.
should I use two different indexes?
index 1 : Cat,Date
index 2 : Cat,Date,Salesman
or only index 2 is enough ?
SQL Indexes
Jul 11, 2006I need to alphabetize PART of a union all query, and was told that this may be accomplished with an index. I tried joining two views, but it does not work! I have NO experience with indexes and need some help.
Here is my code:
Select id, country from countries where id = 6 union all Select id, country from countries where id <> 6
I want the country with id 6 (USA) to be the default on a drop down list, then all the other countries listed after it in alphabetical order. Can you do this with an index? If so, how do I proceed?
Thanks!
Ronna
All Indexes In DB
Nov 15, 2004Hi all,
I want to know all indexes in database.
What do I do to get them?
Thanks in advanced,
Thi Nguyen
Indexes
Feb 6, 2006We recently updated some of the databases from MS Access 2000 to SQL Server 2000. In Access we had columns which were set to Indexed No Duplicates, these were not Primary key fields. Is this possible to set some indexes to prevent duplicates in SQL Server without creating performance issues?
Miranda
Indexes
Feb 16, 2006Do you have to take the DB offline to create or run indexes in SQL Server 2000??
View 2 Replies View RelatedIndexes
May 30, 2007Q1
The table i have stores max 2000 records. Not sure if i neeed a clustered index for this few records. I guess not.
Q2
For the same table as above. How do you create primary keys if there is not unique records.
Do i create a new column? like newColumnID identity? and create a primary key on this new column? Ok even if i create this newcolumn. I don't think it will improve the retrieving speed cause i'm not selecting this column.
Opinions, ideas?
Indexes
Aug 24, 2007i am running a stored procedure which has got clustered indexes created after creating table and data is inserted into it after creating clustered indexes. The tables which are meant in this sp is temporary tables and how to gain the performance of a query
View 2 Replies View RelatedIndexes
Nov 16, 2007I've created indexes for the queries below running select getdate() before and after the query to determine the time. I'm curioius as to how sql server determines and decides how and when to use the indexes for the queries and how the run times of these queries compare. I'm also curious to know what kind of difference there would be on the last two queries as the only difference is the values.
For the last two queries I don't think there would be a difference but hoping that someone would know.
Below are my results:
select count(distinct CustomerID)
from Orders
where Status = 5
SELECT getdate()
go
Create Index Orders_Index On Orders(customerID)
go
SELECT getdate()
select sum(TotalDue)
from Orders
where CustomerID = 11212
select getdate()
go
Create Index Orders_Index On Orders(customerID)
go
select getdate()
select count(distinct AccountNumber)
from Orders
where SalesPersonID = 288
select getdate()
go
Create Index Orders_Index On Orders(salespersonID)
go
select getdate()
select count(distinct AccountNumber)
from Orders
where SalesPersonID = 276
select getdate()
go
Create Index Orders_Index On Orders(salespersonID)
go
select getdate()
Indexes
Sep 13, 2007where can i find a example on how tobuild a script to reindex all my tablesTksDaveP
View 2 Replies View RelatedShould I Use Indexes?
Aug 31, 2006I have a very large table (about 200,000 records), but there are only 2 fields in the table only one populated with data. I need to update the 2nd field with the first field's data.
UPDATE Table1
SET field2 = field1
This is taking a really long time to run about 3.5 minutes.
Is this normal? Can I create an index? What can I do to shorten the run time?
Thanks,
Ninel
Indexes
Apr 23, 2008Aren't all indexes created as separate structures from a table?
Although the index is created against a particular
table, doesn't the index itself exist in the database as a separate,
self-contained structure?
Which index type -- clustered or nonclustered -- logically
sorts the database of a table?