Can anyone tell me how can i optimize this query...

Question

Can anyone tell me how can i optimize this query ??? :
Select Distinct eopersona.numident From rscompeten , rscompet , rscv , eopersona , rscurso , rseduca , rsexplab , rsinteres
Where ( ( (LOWER (rscompeten.nombre LIKE '%caracas%') AND ( rscompeten.id = rscompet.idcompeten ) AND ( rscv.id = rscompet.idcv ) AND ( eopersona.id = rscv.idpersona ) )
OR ( (LOWER (rscurso.nombre) LIKE '%caracas%') AND ( rscv.id = rscurso.idcv ) AND ( eopersona.id = rscv.idpersona ) )
OR ( (LOWER (rscurso.lugar) LIKE '%caracas%') AND ( rscv.id = rscurso.idcv ) AND ( eopersona.id = rscv.idpersona ) )
OR ( (LOWER (rseduca.univinst) LIKE '%caracas%)' AND ( rscv.id = rseduca.idcv ) AND ( eopersona.id = rscv.idpersona ) )
OR ( (LOWER (rsexplab.nombempre) LIKE '%caracas%' AND ( rscv.id = rsexplab.idcv ) AND ( eopersona.id = rscv.idpersona ) )
OR ( (LOWER (rsinteres.descrip) LIKE '%caracas%' AND ( rscv.id = rsinteres.idcv ) AND ( eopersona.id = rscv.idpersona ) )
OR ( (LOWER (rscv.cargoasp) LIKE '%caracas%' AND ( eopersona.id = rscv.idpersona ) )
OR ( LOWER (eopersona.ciudad) LIKE '%caracas%' AND ( eopersona.id = rscv.idpersona )
PLEASE IF YOU FIND SOMETHING WRONG.. PLEASE HELP ME.. this query takes me aproximatelly 10 minutes and the database is really small ( with only 200 records on each table )

Answer 1

You are querying eight tables, however in any of your OR predicates you're only restricting 3 or 4 of those tables. That means that the remaining 4 or 5 tables are generating cartesian products. (n.b. the cartesian product of 5 tables with 200 rows each results in g 200^5 = 320,000,000,000 rows) Then you casually hide this behind "distinct".
A simple restatement of your requirements looks like this:
Select eopersona.numident
  From rscompeten,
       rscompet,
       rscv,
       eopersona
Where LOWER (rscompeten.nombre) LIKE '%caracas%'
   AND rscompeten.id = rscompet.idcompeten
   AND rscv.id = rscompet.idcv
   AND eopersona.id = rscv.idpersona
UNION
Select eopersona.numident
  From rscurso ,
       rscv,
       eopersona
Where LOWER (rscurso.nombre) LIKE '%caracas%'
   AND rscv.id = rscurso.idcv
   AND eopersona.id = rscv.idpersona
UNION
Select eopersona.numident
  From rscurso ,
       rscv,
       eopersona
Where LOWER (rscurso.lugar) LIKE '%caracas%'
   AND rscv.id = rscurso.idcv
   AND eopersona.id = rscv.idpersona
UNION
...From there you can eliminate redundancies as desired, but I imagine that the above will perform admirably with the data volumes you describe.