Tagged Questions

5
votes
1answer
418 views

How to set SQL Server index pages per fragment?

I have SQL Server 2008, and a number of databases. I have discovered that one of my table's indexes is extremely fragmented (How I know: http://msdn.microsoft.com/en-us/library/ms189858.aspx) The ...
1
vote
2answers
113 views

SQL Server clustered index high fragmentation

I've got a Table with an Integer (4bytes) as primary key. it's defined as an identity. it is also the clustered index. Inserts are working perfectly fine. After inserting 2000 rows the fragmentation ...
1
vote
1answer
193 views

MySQL Index Fragmentation

Is there any way to find out the fragmentation of indexes in MySQL ? If such an output can be obtained, it would be helpful to identify which all indexes need to be rebuilt. I'm using MySQL 5.1 on ...
4
votes
2answers
306 views

Why index REBUILD does not reduce index fragmentatation with a page count > 1000?

This is kind of a followup to the existing question on this site "Why index REBUILD does not reduce index fragmentatation?". The accepted answer to that question, and all other resources I have found ...
3
votes
1answer
133 views

I have Fragmented Index on a empty table!

I ran the following query on my database to identify the fragmented indexes. However I surprised when saw the Indexes belong to some empty tables among the highly fragmented indexes! How can it be ...
7
votes
1answer
580 views

How to prevent daily index fragmentation of 99%

I have a highscore table for 100.000 players that is being inserted into 2 times a day with one record per player. At the end of the day the index fragmentation for the indexes in that table is 99%. ...
1
vote
0answers
1k views

SQL Server Rebuild/Reorganize Fragmented Indexes causes CRC error or consistency errors

In our test lab I've been experimenting with different jobs to keep our critical indexes from becoming too fragmented. I'm currently using the approach described here: sys.dm_db_index_physical_stats ...
5
votes
2answers
1k views

Why index REBUILD does not reduce index fragmentatation?

I have used ALTER INDEX REBUILD to remove index fragmentation. In some cases REBUILD does not seem to remove this fragmentation. What are the reasons why REBUILD does not remove fragmentation? It ...
6
votes
2answers
905 views

Defragmentation - Rebuilding Indexes SQL Server 2005

I'm researching defragmenting databases and it seems the following SQL statement is what I'm looking for: ALTER INDEX ALL ON mytablename REBUILD WITH(ONLINE = ON) When I pull the info from ...
5
votes
4answers
855 views

How does SQL Server reduce index fragmentation?

If a user never runs REBUILD or REORGANIZE on their database, does SQL Server still somehow defragment the indexes? MSDN suggests that if an index is over 30% fragmented, it is recommended to run ...
3
votes
1answer
334 views

Index fragmentation increase as more row being deleted

I have a table that contains more than 18 million records. I have a process that clears data out of that table everyday. Index fragmentation was low. This table has high transaction throughput. ...
1
vote
2answers
507 views

How can an identity primary key index become fragmented?

From what I understand about index fragmentation, this should not be possible. The cases I have found in my databases are non-clustered. Example: ALTER TABLE [dbo].[ClaimLineInstitutional] ADD ...
6
votes
3answers
4k views

Why is my database still fragmented after I rebuilt and reindexed everything?

I have a database which I tried to defragment all the tables at once by running this T-SQL: SELECT 'ALTER INDEX all ON ' + name + ' REORGANIZE;' + CHAR(10) + 'ALTER INDEX all ON ' + ...
7
votes
1answer
350 views

B-tree node split strategy in SQL Server for monotonically increasing value

Consider a B-tree index on a value that will always increase monotonically, e.g. a column of type IDENTITY. With a conventional B-tree implementation, whenever a node is full, it will be split 50%/50% ...
2
votes
3answers
790 views

SQL Server Index Fragmentation

When should you rebuild an index? vs reorganize? What index fragmentation value is considered healthy?