Select slowing down
-------------------

                 Key: CORE-4628
                 URL: http://tracker.firebirdsql.org/browse/CORE-4628
             Project: Firebird Core
          Issue Type: Bug
          Components: Engine
    Affects Versions: 2.5.3
            Reporter: Attila Molnár
            Priority: Minor
         Attachments: test.gbk.zip, test.sql

Hi!

See attached files.
Running the SQL you'll see that SELECT statement in the loop block slows down 
by every iteration (dSelect).
Updata (dUpdate) and fetch (dFetch) times are stable.

Runtime statistic shows what you expect
IR : 87121 (form the slowing down select )
NIR : 87121 (from the for select)
UPD : 87121 (from the update)

So looks like index reading slows down.

This is a bug and can be fixed, or this cames from inner desing and works as 
expected?

Thank you!

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