2017年10月11日 · For ad-hoc queries, the object_id column in the sys.query_store_query DMV will be 0, as stated in the sys.query_store_query documentation: object_id : ID of the database object that the query is part of (stored procedure, trigger, CLR UDF/UDAgg, etc.). 0 if the query is not executed as part of a database object (ad-hoc query).

2019年2月24日 · Those ad hoc queries will be removed from the plan cache if they're old enough and room in the cache is required for a newer plan. @DanGuzman's suggestion of optimize for ad hoc workloads is the correct approach to use; only minimal space in the cache will be used for a single-use ad hoc query plan.

2015年8月28日 · An Ad-hoc query is a TSQL Batch that does not contain parameters and is not pre-prepared. SQL Server requires an exact text match for two ad-hoc queries before reuse can occur. The text match is both case- and space-sensitive, even on case-insensitive servers. -- get a count of the number of adhoc query plans use select count(*) as ...

2018年1月31日 · When I run Glen Barrys query: -- Find single-use, ad-hoc and prepared queries that are bloating the plan cache (Query 43) (Ad hoc Queries) SELECT TOP(50) [text] AS [QueryText], cp.cacheobjtype, cp.objtype, cp.size_in_bytes/1024 AS [Plan Size in KB] FROM sys.dm_exec_cached_plans AS cp WITH (NOLOCK) CROSS APPLY …

When you turn the "Optimize for Ad Hoc Workloads" option on, you will cause ad-hoc queries that are run the 2nd time to be just as slow as the 1st, because you will be Compiling an Execution Plan and pulling the same Data (without it cached) those first 2 times. This may not be a big deal, but you'll notice it when testing queries.

2022年9月23日 · For ad hoc and prepared SQL statements, the ID of the database where the statements were compiled. sys.dm_exec_sql_text. But that doesn't match the observed behavior of the system (doc pr here). In the old days, and when that report was written having a null dbid meant that the query wasn't part of a stored procedure.

2015年12月19日 · When it comes to executing ad hoc queries, query plans are created based on complete code, so different parameters or any change in code will prevent reuse of the existing plan. On DBA.StackExchange, the comment on an answer related to the benefits of stored procedures indicates that parametrized queries have exactly the same effect than stored ...

2021年8月9日 · In contrast, running the same SQL ad hoc - outside of sp_executesql but still with parameters - only takes 600 ms. Looking at the cached execution plans, the 2 queries have the exact same query hash but different plans. I DBCC FREEPROCCACHEd the Prepared one (slow one) hoping the following execution would reuse the plan for the Adhoc, fast query.

From the link provided by @SQLFox - The compiled plan stub allows the Database Engine to recognize that this ad hoc batch has been compiled before but has only stored a compiled plan stub, so when this batch is invoked (compiled or executed) again, the Database Engine compiles the batch, removes the compiled plan stub from the plan cache, and adds the full compiled …

2020年1月7日 · Ad hoc queries receive an original query cost value of zero, by default. Upon subsequent execution of the exact same ad hoc query text, by another user process (or the same one), the current query cost is reset to the original compile cost. Since our ad hoc query compile cost is zero, this does not bode well for the possibility of reuse.