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Factors Affecting Changes to the Internal colmodctr Values
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Changes to colmodctr Values r
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All colmodctr values increased by 1 for each row inserted. All colmodctr values increased by 1 for each row deleted. If the update is to nonkey columns: colmodctr values for modi ed columns are increased by 1 for each row updated. If the update is to key columns: colmodctr values are increased by 2 for all the columns in the table, for each row updated. Treated like N INSERT operations. All colmodctr values increased by N where N is the number of rows bulk inserted. Treated like N DELETE operations. All colmodctr values increased by N where N is the table s cardinality.
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BULK INSERT TRUNCATE TABLE
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Skipping the Recompilation Step
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There are several situations in which SQL Server bypasses recompiling a statement for plan optimality reasons. These include the following:
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When the plan is a trivial plan. A trivial plan is one for which there are no alternative plans, based on the tables referenced by the query, and the indexes (or lack of indexes) on those tables. In these cases, where there really is only one way to process a query, any recompilation would be a waste of resources, no matter how much the statistics had changed. Keep in mind that there is no assurance that a query will continue to have a trivial plan just because it originally had a trivial plan. If new indexes have been added since the query was last compiled, there may now be multiple possible ways to process the query.
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Microsoft SQL Server 2008 Internals
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If the query contains the OPTION hint KEEPFIXED PLAN, SQL Server will not recompile the plan for any optimality-related reasons. If automatic updates of statistics for indexes and statistics de ned on a table or indexed view are disabled, all plan optimality-related recompilations caused by those indexes or statistics will stop.
Caution Turning off the auto-statistics feature is usually not a good idea because the
Query Optimizer would no longer be sensitive to data changes in those objects, and suboptimal query plans could easily result. You can consider using this technique only as a last resort after exhausting all of the other alternative ways to avoid recompilation. Make sure you thoroughly test your applications after changing the auto-statistics options to verify that you are not hurting performance in other areas.
If all the tables referenced in the query are read-only, SQL Server will not recompile the plan.
Multiple Recompilations
In the previous discussion of unplanned recompilation, we primarily described situations in which a cached plan would be recompiled prior to execution. However, even if SQL Server calculates that it can reuse an existing plan, there may be cases where stale statistics or schema changes are discovered after the batch begins execution, and then a recompile occurs after execution starts. Each batch or stored procedure can contain multiple query plans, one for each optimizable statement. Before SQL Server begins executing any of the individual query plans, it checks for correctness and optimality of that plan. If one of the checks fails, the corresponding statement is compiled again, and a possibly different query plan is produced. In some cases, query plans may be recompiled even if the plan for the batch was not cached. For example, if a batch contains a literal larger than 8 KB, it is never cached. However, if this batch creates a temporary table, and then inserts multiple rows into that table, the insertion of the seventh row causes a recompilation because of passing the recompilation threshold for temporary tables. Because of the large literal, the batch was not cached, but the currently executing plan needs to be recompiled. In SQL Server 2000, when a batch was recompiled, all the statements in the batch were recompiled, not just the one that initiated the recompilation. SQL Server 2005 introduced statement-level recompilation, which means that only the statement that causes the recompilation has a new plan created, not the entire batch. This means that SQL Server spends less CPU time and memory during recompilations.
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