Yes, this wideo is usefull and show where the problem is.

1. Something is not satisfy by ypour filter and go throught 1M rows when you 
have this one additional record vs 21K.
2. First run go from disk – 59K reads from disk vs 2.5K.

Look about your where clause and also if your inner join catch whole index 
segments (explained plan can help here).
Also increase cache of this database.

Regards,
Karol Bieniaszewski
        • ... Rudi Feijó rudi.fe...@multidadosti.com.br [firebird-support]
          • ... Dimitry Sibiryakov s...@ibphoenix.com [firebird-support]
            • ... Rudi Feijó rudi.fe...@multidadosti.com.br [firebird-support]
              • ... Dimitry Sibiryakov s...@ibphoenix.com [firebird-support]
              • ... Rudi Feijó rudi.fe...@multidadosti.com.br [firebird-support]
              • ... John vdW j...@jvdw.nl [firebird-support]
              • ... Rudi Feijó rudi.fe...@multidadosti.com.br [firebird-support]
              • ... John vdW j...@jvdw.nl [firebird-support]
  • [firebi... Rudi Feijó rudi.fe...@multidadosti.com.br [firebird-support]
    • [f... hv...@users.sourceforge.net [firebird-support]
    • OD... Karol Bieniaszewski liviusliv...@poczta.onet.pl [firebird-support]
      • ... Rudi Feijó rudi.fe...@multidadosti.com.br [firebird-support]
        • ... Dimitry Sibiryakov s...@ibphoenix.com [firebird-support]

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