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DMV categories in SQL Server
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GO SELECT * FROM AB_Utility.dbo.AB_GetMissingIndexes ( 'Org00010001', 50 );
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DMV categories in SQL Server
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Table 1 lists the DMV categories in both SQL Server 2005 and SQL Server 2008. Table 2 lists the new DMV categories in SQL Server 2008.
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Table 1 DMV categories in SQL Server 2005 and 2008 DMVs sys.dm_clr_* URL for more information http://msdn.microsoft.com/en-us/ library/ms179982.aspx http://msdn.microsoft.com/en-us/ library/ms181626.aspx http://msdn.microsoft.com/en-us/ library/ms173571.aspx http://msdn.microsoft.com/en-us/ library/ms188068.aspx http://msdn.microsoft.com/en-us/ library/ms174971.aspx http://msdn.microsoft.com/en-us/ library/ms187974.aspx http://msdn.microsoft.com/en-us/ library/ms190314.aspx http://msdn.microsoft.com/en-us/ library/ms187407.aspx http://msdn.microsoft.com/en-us/ library/ms176053.aspx http://msdn.microsoft.com/en-us/ library/ms176110.aspx http://msdn.microsoft.com/en-us/ library/ms176083.aspx http://msdn.microsoft.com/en-us/ library/ms178621.aspx
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DMV category Common Language Runtime (CLR) Database
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sys.dm_db_*
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sys.dm_db_mirroring_*
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sys.dm_exec_*
Full-text search
sys.dm_fts_*
Indexes
sys.dm_db[_missing|_index_*
Input/output (I/O)
sys.dm_io_*
Query notifications
sys.dm_qn_*
Replication
sys.dm_repl_*
Service broker
sys.dm_broker_*
SQL Server operating system Transactions
sys.dm_os_*
sys.dm_tran_*
Table 2
My favorite DMVs, and why
New DMV categories in SQL Server 2008 DMV URL http://msdn.microsoft.com/ en-us/library/bb522478.aspx http://msdn.microsoft.com/ en-us/library/bb677293.aspx http://msdn.microsoft.com/ en-us/library/bb630390.aspx http://msdn.microsoft.com/ en-us/library/bb934218.aspx http://msdn.microsoft.com/ en-us/library/bb677257.aspx
Change data capture
sys.dm_cdc_*
Extended events
sys.dm_xe_*
Object (dependency)
sys.dm_sql_*
Resource governor
sys.dm_resource_governor_*
Security
sys.dm_[audit|cryptographic|etc]_*
Summary
Gone are the days of running DBCC commands and system stored procedures over and over again, and keeping links to Profiler and Performance Monitor on every machine s desktop, when trying to peek into the usage characteristics of our SQL Server instances. I hope I have provided a glimpse of how much power we have been given through DMVs and DMFs, and that I have inspired you to use them more often when observing usage or troubleshooting performance issues.
About the author
Aaron Bertrand is the Senior Data Architect at One to One Interactive, a global marketing agency headquartered in Boston, Massachusetts. At One to One, Aaron is responsible for database design and application architecture. Due to his commitment to the community, shown through blogging at http:/ /www.sqlblog.com, peer-to-peer support on forums and newsgroups, and speaking at user group meetings and code camps, he has been awarded as a Microsoft MVP since 1998. Aaron recently published a technical white paper for Microsoft, detailing how to use the new Resource Governor feature in SQL Server 2008.
30 Reusing space in a table
Joe Webb
People who have switched to Microsoft SQL Server from Microsoft Access sometimes ask, If I delete a bunch of rows, do I need to compact my SQL Server database It s been many years since I ve used Access, but I still remember the reason for their concern. Access would continually add rows to the end of the table. If some, or even all, of the rows were deleted from the table, Access wouldn t reuse the space. It kept adding rows to the end of the table and never backfilled the holes. Compacting the Access database file would get rid of the holes.
Understanding how SQL Server automatically reuses table space
I m not an expert in Access, and I m certainly not knocking it. I haven t even used Access since v2.0 back in the 1990s. This behavior may have changed since then, or perhaps I misremember, but suffice it to say that with SQL Server this is not an issue. But don t take my word for it. Let s consider an example to prove the point. To set up the example, let s create a table with three columns and then populate it with test data. The T-SQL code for doing this is shown in listing 1.
Listing 1 Creating and populating the dbo.Test table
USE tempdb ; GO --create a test table CREATE TABLE dbo.Test ( col1 INT ,col2 CHAR(25) ,col3 VARCHAR(4000) ) ; --create some test data DECLARE @cnt INT ; SET @cnt = 0 ;
WHILE @cnt < 1000 BEGIN SELECT
Reusing space in a table
@cnt = @cnt + 1 ; INSERT VALUES dbo.Test ( col1,col2,col3 ) ( @cnt ,'test row # ' + CAST(@cnt AS VARCHAR(10)) + 'A' ,REPLICATE('ABCD', ROUND(RAND() * @cnt, 0)) ) ;
The CREATE TABLE statement creates a table called Test as part of the dbo schema in the tempdb database. The table is composed of three columns. The first is an integer, the second is a fixed length character string that contains 25 characters, and the third and final column is a variable length character string that can contain up to 1900 characters. To add test data, we will use a simple INSERT statement. The INSERT statement has been placed inside a WHILE loop and is executed 1,000 times. Note that the last column in the table will vary in length from zero to a maximum of 4,000. Statistically, it should average around 1,000 characters. Let s view the contents of the table to make sure we have what we think we have. We can do this by running a SELECT statement to retrieve the data, as shown in listing 2. The results of the query are shown in figure 1.
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