X Force X32 Exe BIM 360 Plan 2018 Free Download
Janet Denzel
When a plan is forced for a particular query, every time SQL Server encounters the query, it tries to force the plan in the Query Optimizer. If plan forcing fails, an Extended Event is fired and the Query Optimizer is instructed to optimize in the normal way.
You can force plans on a secondary replica when Query Store for secondary replicas is enabled. Execute sp_query_store_force_plan and sp_query_store_unforce_plan on the secondary replica. The optional @force_plan_scope argument defaults only to the local replica (primary or secondary), but you can optionally specify a replica_group_id referencing sys.query_store_replicas.
The resulting execution plan forced by this feature is the same or similar to the plan being forced. Because the resulting plan may not be identical to the plan specified by sys.sp_query_store_force_plan, the performance of the plans may vary. In rare cases, the performance difference may be significant and negative; in that case, the administrator must remove the forced plan.
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I've been wondering for a while why there doesn't seem to be any option to 'Disable' a query plan from running. I know I can delete a plan from the cache, but there's nothing stopping it recreating it right?
I don't understand also why it picked a timeout plan 10 times in a row (the last purple square) and didn't even attempt the other plans once. But that's probably a different question. Also if you're curious - the above query is to get order history for a specific SKU - so the corresponding number of source rows may vary greatly for each SKU.
If we instead blacklisted one or more plans, the optimizer now has to generate a plan and iterate through a list of blacklisted plans to see if any match (or something similar). And what is the matching criteria - do the variables and row estimates have to be the exact same, or just the "shape" of the plan? In addition to requiring caching space for all these potential blacklist plans, if the newly created plan matches a blacklisted plan, what would happen?
Try to generate a new one again? Fall back to the "next best" (so now we're saving multiple plan copies for potential use...)? Something else? What if we've accidentally blacklisted all the valid plans to get the data?
The more you go through this thought exercise, the more intricacies come about, and it quickly becomes clear that this isn't a good idea. Keeping the optimizer from landing on a specific plan would be costly and incredibly complex in addition to probably not working well.
The current ways (I'm oversimplifying) to affect plan shape are hinting, which usually removes options from the optimizer, and forcing a particular plan, whether with USE PLAN, plan guide, or Query Store.
SQL Server Query Store is a new feature introduced in SQL Server 2016 that is used to automatically and asynchronously capture query execution history, statistics and plans, with minimal impact to overall SQL Server Performance. The Query Store feature makes performance problem troubleshooting simple; you can view the query execution plans changes and compare its performance to decide which execution plan the SQL Server Query Optimizer should use for that query.
By default, SQL Server keeps the latest execution plan only for the query, and any schema, statistics or indexes changes could change the query execution plan that is used by the Query Optimizer. The plan can be also dropped due to pressure in the plan cache memory. Not all changes in the execution plans will enhance the query performance, such changes could cause degradation in the query performance.
What gives this feature value over monitoring the query performance using the classic system DMVs, is that the Query Store data is available after restarting or upgrading the SQL Server instance. It also allows you to choose the execution plan that will be followed to run the query, rather than using the one preferred by the SQL Server Query Optimizer.
The SQL Server Query Store consists of two main store parts; the Plan Store, where the execution plans information stored, and the Runtime State Store, where the execution statistics will be stored. The query execution statistics and plans are stored first in memory, and flushed to the disk after a specific interval of time. In this way, the Query Store information will not be lost when the SQL Server service is restarted, as the data is hardened to the disk. The default flush to disk configurable database option DATA_FLUSH_INTERNAL_SECONDS value is 15 minutes, this means that, the executed queries information will be written to the disk from the Query Store every 15 minutes. The smaller flush interval, the more frequent write-to-disk operations, the worst SQL performance. The Query Store data will be flushed automatically to the disk to release the memory for other processes if there is a memory pressure. For proper memory and space usage for the Query Store, the execution information is aggregated in the memory first over fixed interval of time, and then flushed to the disk in aggregated form. The max_plans_per_query option can be used to control the number of plans that will be stored for review.
SQL Server Query Store provides you with an easy way to troubleshoot query performance, where you can identify the top CPU, Memory and IO consuming queries, with full execution history for these queries in addition to find which and when the query performance regressed and fix it directly by forcing the best plan, preventing the SQL Server Query Optimizer from using the less efficient new plan. It also can be used to draw a general image about the workload of your environment, with the query text, execution plans, the number of executions and SQL Server resources utilization, which can help you in evaluating how much resources required by your SQL Server database.
When the query is executed for its first time, the query execution plan with full query properties and statistics will be stored in the Query Store internal tables. If you run the query again and the SQL Server Query Optimizer decides to recompile the query and create a new execution plan, this plan will be added to the Query Store, in addition to the old one, with the plan and query execution statistics. Query Store allows you to track the queries execution plans and performance changes, and enforce the plan that the query behaves better when you execute the query with it. When a query is compiled, the SQL Server Query Optimizer will take the latest plan in the plan cache if it is still useful, unless a PLAN HINT is used, or another plan is forced by the Query Store. In this case, the Query Optimizer will recompile the query and use that new plan. No change is required from the application side to perform that, as this is performed transparently from the users.
To start using the new Query Store feature, you need to enable it at the database level, then it will start capturing the queries execution statistics and plans automatically. The below ALTER DATABASE statement is used to enable the Query Store feature on the SQLShackDemo database , which is disabled by default, and specify the operation mode for that feature:
You can also use the SQL Server Management Studio to enable the Query Store, from the Database Properties window below, where you can find the new Query Store tab introduced when you use the SQL Server 2016 version:
As you can see from the previous image, SQL Server Query Store can be run in two operation modes; Read-Only mode, where you can only use the persisted statistics to analyze the queries , without capturing any new data. This occurrs when the Query Store reaches its maximum allocation space. In Read-Write mode, the Query Store will capture the execution statistics for the current workload and store it, to be used for analyzing the queries execution performance. The DATA_FLUSH_INTERVAL_SECONDS option determines how frequent the Query Store data stored in the memory will be asynchronously transferred to the disk. By default, SQL Server will write the in-memory Query Store statistics to the disk every 15 minutes, or 900 seconds. You can also flush the Query Store data manually from the memory to the disk by executing the below query:
The maximum size of data that can be stored in the Query Store can be controlled by the MAX_STORAGE_SIZE_MB option. As mentioned previously, exceeding that limit will change the Query Store operation mode to Read-Only mode automatically. By default, the Query Store can keep up to 100 MB of query statistical data before transferring to the Read-Only operation mode. You can make sure that the Query Store will activate the cleanup process if the execution data exceeds the MAX_STORAGE_SIZE_MB value by setting the SIZE_BASED_CLEANUP_MODE to AUTO, which is the default value, or turn it OFF to stop the automatic cleanup process.
The QUERY_CAPTURE_MODE option specifies if the Query Store will capture ALL queries, or ignore the queries that are not running frequently or running on a very small time with AUTO capture mode or stop capturing any new query using the NONE capture mode. The number of days to keep the Query Store data is specified by the STALE_QUERY_THRESHOLD_DAYS parameter.
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