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Performance degradation in FB 3.0.2 compared to FB 2.5.7 [CORE5421] #5694

firebird-automations opened this issue Dec 15, 2016 · 5 comments


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Submitted by: Andrei Kireev (andreik)

Votes: 2

Here is the query:

SELECT FIRST(1), doc.documentdate
usr$wg_taxation card
JOIN gd_document doc ON = card.documentkey
card.usr$emplkey = :emplkey
doc.documentdate <= :begindate
doc.documentdate DESC

Table usr$wg_taxation has 1 record, table gd_document -- 7.5 millions.

Statistics for PK of usr$wg_taxation -- 1.
Statistics for PK of GD_DOCUMENT -- 1.3158557976567E-7
Statistics for GD_X_DOCUMENT_DOCUMENTDATE index -- 0.00020177561964374.

FB 2.5.7 execution time less than 1 ms.


FB 3.0.2 execution time 13 156 ms.

Query plan:

Select Expression
-> First N Records
-> Nested Loop Join (inner)
-> Filter
-> Table "GD_DOCUMENT" as "DOC" Access By ID
-> Index "GD_X_DOCUMENT_DOCUMENTDATE" Range Scan (lower bound: 1/1)
-> Filter
-> Table "USR$WG_TAXATION" as "CARD" Access By ID
-> Bitmap
-> Index "RDB$PRIMARY502" Unique Scan

Commits: 60d20db 5dca3df

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Collaborator Author

Modified by: @dyemanov

assignee: Dmitry Yemanov [ dimitr ]

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Commented by: José R López (jrl)

It seems that this issue is the same described in CORE5310 and comments (Incorrect PLAN using in Firebird 3 making it slow): Firebird 3 is sometimes choosing the index with less selectivity.

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Modified by: @dyemanov

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

resolution: Fixed [ 1 ]

Fix Version: 3.0.2 [ 10785 ]

Fix Version: 4.0 Alpha 1 [ 10731 ]

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Modified by: @pavel-zotov

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

QA Status: No test => Done successfully

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Modified by: @pavel-zotov

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

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