sys.dm_exec_cached_plan_dependent_objects in Visual Basic .NET

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sys.dm_exec_cached_plan_dependent_objects
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The sys.dm_exec_cached_plan_dependent_objects function returns one row for every dependent object of a compiled plan when you pass a valid plan_handle in as a parameter. If the plan_handle is not that of a compiled plan, the function returns NULL. Dependent objects include executable plans, as discussed previously, as well as plans for cursors used by the compiled plan. The example shown here uses sys.dm_exec_cached_plan_dependent_objects, as well as sys.dm_exec_cached_plans, to retrieve the dependent objects for all compiled plans, the plan_handle, and their usecounts. It also calls the sys.dm_exec_sql_text function to return the associated T-SQL batch:
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SELECT text, plan_handle, d.usecounts, d.cacheobjtype FROM sys.dm_exec_cached_plans CROSS APPLY sys.dm_exec_sql_text(plan_handle) CROSS APPLY sys.dm_exec_cached_plan_dependent_objects(plan_handle) d;
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Microsoft SQL Server 2008 Internals
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sys.dm_exec_requests
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The sys.dm_exec_requests view returns one row for every currently executing request within your SQL Server instance and is useful for many purposes in addition to tracking down plan cache information. This DMV contains the sql_handle and the plan_handle for the current statement, as well as resource usage information for each request. For troubleshooting purposes, you can use this view to help identify long-running queries. Keep in mind that the sql_handle points to the T-SQL for the entire batch. However, the sys.dm_exec_requests view contains the statement_start_offset and statement_end_offset columns, which indicate the position within the entire batch where the currently executing statement can be found. The offsets start at 0, and an offset of 1 indicates the end of the batch. The statement offsets can be used in combination with the sql_handle passed to sys.dm_exec_sql_text to extract the query text from the entire batch text, as demonstrated in the following code. This query returns the 10 longest-running queries currently executing:
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SELECT TOP 10 SUBSTRING(text, (statement_start_offset/2) + 1, ((CASE statement_end_offset WHEN -1 THEN DATALENGTH(text) ELSE statement_end_offset END - statement_start_offset)/2) + 1) AS query_text, * FROM sys.dm_exec_requests CROSS APPLY sys.dm_exec_sql_text(sql_handle) ORDER BY total_elapsed_time DESC;
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Note that including the * in the SELECT list indicates that this query should return all of the columns from the sys.dm_exec_requests view. You should replace the * with the columns that you are particularly interested in, such as start_time, blocking_session_id, and so on.
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sys.dm_exec_query_stats
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Just as the text returned from the sql_handle is the text for the entire batch, the compiled plans that are returned are for the entire batch. For optimum troubleshooting, we can use sys.dm_exec_query_stats to return performance information for individual queries within a batch. This view returns performance statistics for queries, aggregated across all executions of the same query. This view also returns both a sql_handle and a plan_handle, as well as the start and end offsets like we saw in sys.dm_exec_requests. The following query returns the top 10 queries by total CPU time, to help you identify the most expensive queries on your SQL Server instance:
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SELECT TOP 10 SUBSTRING(text, (statement_start_offset/2) + 1, ((CASE statement_end_offset WHEN -1 THEN DATALENGTH(text) ELSE statement_end_offset END - statement_start_offset)/2) + 1) AS query_text, *
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FROM sys.dm_exec_query_stats CROSS APPLY sys.dm_exec_sql_text(sql_handle) CROSS APPLY sys.dm_exec_query_plan(plan_handle) ORDER BY total_elapsed_time/execution_count DESC;
Plan Caching and Recompilation
This view has one row per query statement within a batch, and when a plan is removed from cache, the corresponding rows and the accumulated statistics for that statement are removed from this view. In addition to the plan_handle, sql_handle, and performance information, this view contains two new columns in SQL Server 2008, which can help you identify similar queries with different plans.
query_hash This value is a hash of the query text and can be used to identify similar queries with the plan cache. Queries that differ only in the values of constants have the same query_hash value. query_plan_hash This value is a hash of the query execution plan and can be used to identify similar plans based on logical and physical operators and a subset of the operator attributes. To look for cases where you might not want to implement forced parameterization, you can search for queries that have similar query_hash values but different query_plan_hash values.
There are two main differences between sys.dm_exec_cached_plans and sys.dm_exec_query_stats. First, sys.dm_exec_cached_plans has one row for each batch that has been compiled and cached, whereas sys.dm_exec_query_stats has one row for each statement. Second, sys.dm_exec_query_stats contains summary information aggregating all the executions of a particular statement. The sys.dm_exec_query_stats returns a tremendous amount of performance information for each query, including the number of times it was executed, and the cumulative I/O, CPU, and duration information. Keep in mind that this view is updated only when a query is completed, so you might need to retrieve information multiple times if there is currently a large workload on your server.
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