Data File Auto Grow Event Class Data File Auto Shrink Event Class in VB.NET

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Data File Auto Grow Event Class Data File Auto Shrink Event Class
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This event indicates that the data file has been
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shrunk.
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This event indicates that the log file grew automatically. It is not triggered if the log file is grown explicitly through ALTER DATABASE.
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Log File Auto Grow Event Class Log File Auto Shrink Event Class
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This event indicates that the log file shrunk automatically. It is not triggered if the log file shrinks explicitly through ALTER DATABASE.
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Updating Statistics
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After a series of INSERT, DELETE, or UPDATE Transact-SQL statements are performed on a table, the statistics might not reflect the true data distribution in a given column or index. If a column in a table has undergone substantial update activity since the last time the statistics were created or updated, SQL Server automatically updates the statistics by sampling the column values (using auto-update statistics). The statistics auto-update is triggered by query optimization or by execution of a compiled plan, and it involves only a subset of the columns referred to in the query. If the query optimizer needs a particular statistics object when a query is first compiled and that statistics object exists, the statistics object is updated (if it is out of date). When
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Troubleshooting Database and Server Performance
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you execute a query and its plan is in the cache, the query optimizer checks the statistics on which the plan depends to see whether they are out of date. If so, SQL Server removes the plan from the cache and updates the statistics during recompilation of the query. SQL Server also removes the plan from the cache if any of the statistics that it depends on have changed. The auto-update statistics feature can be turned off at different levels. At the database level, you can disable auto-update statistics using ALTER DATABASE dbname SET AUTO_UPDATE_STATISTICS OFF. At the table level, you can disable auto-update statistics using the NORECOMPUTE option of the UPDATE STATISTICS or CREATE STATISTICS command.
NOTE
Sampling rate
Auto-statistics update is always performed by sampling the index or table using the default sampling rate. To set the sampling rate explicitly, you need to run CREATE STATISTICS or UPDATE STATISTICS.
The sp_autostats Stored Procedure
You can use the stored procedure sp_autostats to display and change the auto-update statistics setting for a table, an index, or a statistics object. You can re-enable the automatic updating of statistics by using ALTER DATABASE, UPDATE STATISTICS, or the sp_autostats stored procedure. You cannot override the database setting of OFF for auto-update statistics by setting it ON at the statistics object level.
NOTE
Disabled nonclustered indexes
Statistics on disabled nonclustered indexes are also updated by sp_updatestats. The sp_updatestats stored procedure ignores tables with a disabled clustered index.
The sp_updatestats Stored Procedure
The sp_updatestats stored procedure runs UPDATE STATISTICS against all userdefined and internal tables in the current database. It specifies the ALL keyword against all user-defined and internal tables in the database. The stored procedure displays messages that indicate its progress. When the update is completed, it reports that statistics have been updated for all tables.
Lesson 3: Troubleshooting Database Performance
Evaluating Index Usage
A database index lets SQL Server quickly find specific information in a table or indexed view. It contains keys built from one or more columns in the table or view, and pointers that map to the storage location of the specified data. You can significantly improve the performance of database queries and applications by creating welldesigned indexes to support your queries. Indexes can reduce the amount of data that must be read to return the query result set. Indexes can also enforce uniqueness on the rows in a table, ensuring the data integrity of the table data. An index contains keys built from one or more columns in the table or view. These keys are stored in a structure known as a b-tree that enables SQL Server to find the row or rows associated with the key values quickly and efficiently. A table or view can contain clustered or nonclustered indexes.
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