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Optimize data retrieval for tables when no fields are accessed [CORE1598] #2019

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firebird-issue-importer opened this issue Nov 16, 2007 · 6 comments

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Submitted by: @dyemanov

There are some queries (e.g. select count(*) from <tab>) that don't access any table fields (explicitly or implicitly). In this case, only the record header could be processed and the record data decompression could be avoided. Simple tests against the prototype implementation show about 50-80% of performance improvement (when appropriate data pages are cached).

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@firebird-issue-importer firebird-issue-importer commented Nov 21, 2007

Modified by: @dyemanov

status: Open [ 1 ] => Resolved [ 5 ]

resolution: Fixed [ 1 ]

Fix Version: 2.5 Alpha 1 [ 10224 ]

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@firebird-issue-importer firebird-issue-importer commented Nov 21, 2007

Modified by: @dyemanov

Target: 2.5.0 [ 10221 ]

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@firebird-issue-importer firebird-issue-importer commented Nov 21, 2007

Modified by: @dyemanov

priority: Major [ 3 ] => Minor [ 4 ]

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@firebird-issue-importer firebird-issue-importer commented Jan 28, 2008

Modified by: @pcisar

Workflow: jira [ 13430 ] => Firebird [ 14075 ]

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@firebird-issue-importer firebird-issue-importer commented Nov 12, 2009

Modified by: @pcisar

status: Resolved [ 5 ] => Closed [ 6 ]

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@firebird-issue-importer firebird-issue-importer commented Jan 19, 2016

Modified by: @pavel-zotov

QA Status: No test

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