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Display SQL Server table I/O

SQL Server Tips by Donald Burleson


This is one of the many SQL Server Windows scripts to display table I/O, from the book "High Performance SQL Server DBA".

This SQL Server 2005 enhancement means the procedures above need to be altered to account for the iostall column being broken up into two columns.  The temporary table holding the I/O statistical data must be changed, as does the INSERT statement that inserts file metric info into it and the final SELECT, which presents the information. 

SQL Server 2005 presents an easy way to drill deeper in order to retrieve actual object I/O statistical data.  The sys.dm_db_index_operational_stats function provides good data that helps pinpoint hot objects in various databases.  This function can be used to get data back on: an entire SQL Server but is not recommended if there are many of databases and objects; a particular database; or a specific object.  There are many columns returned by the function, but the object_io.sql   query below will give some of the most interesting statistics that will help reveal the objects under heavy I/O pressure:

 

<    table_io.sql

select
    object_name = object_name(object_id),
    index_id,
    partition_number,
    range_scans,
    singleton_lookups
    forwarded_fetches,
    lob_fetches,
    leaf_inserts
    leaf_updates,
    leaf_deletes
    row_locks,
    row_lock_waits,
    row_lock_wait_ms,
    page_locks,
    page_lock_waits,
    page_lock_wait_ms,
    page_latch_waits
    page_latch_wait_ms
from
    sys.dm_db_index_operational_stats (db_id(),-1,-1)
where
See code depot for full script

The above query uses the current database as an example, but a database name can be fed to the query if the DBA desires to run it outside of the database for which statistics are desired.  Again, this query will help uncover hub objects in key databases that may benefit from better indexing, partitioning, reorganization, or relocation to lesser-used physical devices so response times may be reduced.  Special attention must be paid to the range_scans , forwarded_fetches , and wait time columns.

This is one of the many SQL Server scripts to display table I/O from the book "High Performance SQL Server DBA".


 

 

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