22 Nov 2019 An Eager Index Spool reads all rows from its child operator into an indexed worktable, before it starts returning rows to its parent operator.
2 dagar sedan · There are different logical spool operators like Lazy Spool, Eager Spool (we are going discuss in near future). The difference between them are how data is populated for each of these operators.In general Spool temporary tables are referenced as worktables in I/O stats.
The primary advantage of an index spool is that it caches all previously seen results. Both Eager spools are on the target table and are indicated as index inserts. This seems really strange to me since I am doing an insert, and not an update. The target table is about 8M rows, and The eager table spool is supposed to provide full phase separation between the reading and writing sides of the statement.
Index spool / eager spool costing 70% of query. Hi, After installing SP3 I have a query that is taking about 10 times longer to execute. When I turn on the query analyzer exection plan I see that 70% of the cost is in doing an Index spool / eager spool step after a table scan. However the execution plan says that the row count was 0 for this The large query now ran in 51 seconds using a clustered index seek, rather than the 972 of the eager spool it was using before.
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The target table is about 8M rows, and The eager table spool is supposed to provide full phase separation between the reading and writing sides of the statement. It fails to do that on this occasion, partly because the spool is executed using parallelism. Multiple threads cooperate to fully scan the test table once.
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Query performance and SP2 2009-09-09 · Spool operations are temporary storage of the data for later reuse in a query plan. There are two types of spool operations, eager spool and lazy spool. A spool is basically a temporary table created within the execution of the query that is used when it’s likely that data will be needed again, and again during the execution of the query. Index spool / eager spool costing 70% of query. Hi, After installing SP3 I have a query that is taking about 10 times longer to execute.
Index and Table Spools.
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The Lazy Index Spool operator is only available with apply. The index spool maintains a worktable that is not truncated when outer reference values change. Instead, new data is added to the existing cache, indexed by the outer reference values. Hi Yogesh, There are different logical spool operators like Lazy Spool, Eager Spool (we are going discuss in near future).
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So that makes the eager spool a blocking operator as it fetches all the rows at one go and stores it in a temp table. Removing cross join does remove the index spool eager spool. it runs in about 16 min now in prod. Not sure if this is what the results should be as the output is much less - will ask developer.
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Lazy Spool. Let’s first understand each of the above spool in details and then we will proceed for examples-Table Spool.