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The script below will create a data file, create a 10MB ‘filler’ table at the start of the data file, create a 10MB ‘production’ clustered index, and then analyze the fragmentation of the new clustered index.
USE [master]; GO IF DATABASEPROPERTYEX (N'DBMaint2008', N'Version') IS NOT NULL DROP DATABASE [DBMaint2008]; GO CREATE DATABASE DBMaint2008; GO USE [DBMaint2008]; GO SET NOCOUNT ON; GO -- Create the 10MB filler table at the 'front' of the data file CREATE TABLE [Filler Table] ( [c1] INT IDENTITY, [c2] CHAR (8000) DEFAULT 'filler'); GO -- Fill up the filler table INSERT INTO [Filler Table] DEFAULT VALUES; GO 1280 -- Create the production table, which will be 'after' the filler table in the data file CREATE TABLE [Prod Table] ( [c1] INT IDENTITY, [c2] CHAR (8000) DEFAULT 'production'); CREATE CLUSTERED INDEX [prod_cl] ON [Prod Table] ([c1]); GO INSERT INTO [Prod Table] DEFAULT VALUES; GO 1280 -- Check the fragmentation of the production table SELECT [avg_fragmentation_in_percent] FROM sys.dm_db_index_physical_stats ( DB_ID (N'DBMaint2008'), OBJECT_ID (N'Prod Table'), 1, NULL, 'LIMITED'); GO The logical fragmentation of the clustered index before the shrink is a near-perfect 0.4%.
In the case above, it completely reversed the order of the clustered index, taking it from perfectly defragmented to perfectly fragmented.
.) One of my biggest hot-buttons is around shrinking data files.
Although I used to own the shrink code while I was at Microsoft, I didn’t write it (so don’t blame me!
I tried to have it removed from the product for SQL 2005 and SQL 2008 when I was in a position to do so – the only reason it’s still there is for backwards compatibility.
Don’t fall into the trap of having a maintenance plan that rebuilds all indexes and then tries to reclaim the space required to rebuild the indexes by running a shrink – that’s a zero-sum game where all you do is generate a log of transaction log for no actual gain. For instance, if you’ve deleted a large proportion of a very large database and the database isn’t likely to grow, or you need to empty a file before removing it?
And what's more, Google will actually reward you for doing it!
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I’m talking about actually running the shrink algorithm.
Shrinking of data files should be performed even more rarely, if at all.
Now, will that have any effect on your workload performance? A data file shrink operation works on a single file at a time, and uses the GAM bitmaps (see Inside The Storage Engine: GAM, SGAM, PFS and other allocation maps) to find the highest page allocated in the file.Tags: Adult Dating, affair dating, sex dating