Firebird删除非常慢

Question

Im making this simple transaction:

DELETE FROM ominve01 
WHERE CVE_OBS IN (SELECT CVE_OBS 
                  FROM minve01 M 
                  WHERE M.FECHA_DOCU < '31.12.2010' 
                  OR FECHA_DOCU > '31.12.2015')

• minve01 has 189k rows
• ominve01 has 86k rows

But it takes about 2 1/2 hours to complete deleting. Is my query bad? how can I improve it?

or how can i increase the transaction speed?

• ominve01.cve_obs is pk
• minve01.cve_obs is not pk

Answer 1

DELETE FROM ominve01 N 
WHERE 
exists(SELECT * FROM minve01 M 
       WHERE M.FECHA_DOCU < '31.12.2010' 
       OR FECHA_DOCU > '31.12.2015' and
N.CVE_OBS=M.CVE_OBS)

or execute block (you need to correct type of variable)

execute block
as
declare variable v integer;
begin
for SELECT M.CVE_OBS 
                  FROM minve01 M 
                  WHERE M.FECHA_DOCU < '31.12.2010' 
                  OR FECHA_DOCU > '31.12.2015'
into :v do delete from ominve01 WHERE CVE_OBS=:v;
end