Regroup a lot of small sql request

Question

hello
I'am developping a server in c
This server connects to a database
I use oo4o for the connection
But I have I problem because I have a lot of small request like that
select cdf_nom
from cdf_codif, fitty_typeinteraction
where
     fitty_fit_code_fk_pk like '183'
     and fitty_cdf_type_code_fk_pk = cdf_code_pk
     and cdf_numero_pk like 'IY'
All works ok but the application is too slow because I have a function in c by request like that
     strcpy(sqls,"select cdf_nom");
     strcat(sqls," from splab_specialite_labo, cdf_codif");
     strcat(sqls," where");
     strcat(sqls," splab_sp_code_fk_pk like '");
     strcat(sqls,idLabo);
     strcat(sqls,"' ");
     strcat(sqls," and splab_cdf_lab_code_fk_pk = cdf_code_pk");
     strcat(sqls," and cdf_numero_pk like '15'");
     /* execute la requete */
     requete.Open(*databb,sqls);
     while (!requete.IsEOF())
          /* balise statutLabo */
          requete.GetFieldValue("cdf_nom", statutLabo,TAILLE_CDF_NOM);
          if (strlen(statutLabo) != 0)
               bstrValue = AsciiToBSTR(statutLabo);
               if (!bstrValue)
                    ERROR1("Theriaque : AsciiToBSTR function failed");
                    goto shutdown ;
               cleanAllString(bstrValue);
               elementNode = requestDoc->CreateNode(NODE_ELEMENT, V_StatutLabo, rootRequestNode, bstrValue);
               if (!elementNode)
                    ERROR1("Theriaque : creation of element node failed");
                    goto shutdown ;
               SAFERELEASE(elementNode);
               if (bstrValue) SysFreeString(bstrValue);
               bstrValue = NULL ;
          requete.MoveNext();
I would like to know how to optimise it but I can't regroup all the small request in a big requestbecause it's to slow
If it's possible a pl/sql bloc it's will be great

Answer 1

Usually very large directories suffer from bad access times. If you have a single directory with nearly a million files, you will discover that the time for opening the file is much greater than the time for reading it.
If you have a directory tree containing the files (say that you have a directory, with 100 subdirectories, each one containing 100 subdirectories, each one containing 100 files) you can open the files much faster.