Zeoslib Portal

Posted: **04.03.2009, 14:24**

Hello.

I'm working in a little database with SQLite. Till now I'm using CNPack for SQLite2. Works very well, It make 3 tables and 1 index in 10 seconds or less. The tables are populating with records and the greatest have 1700 records with 5 fields. I repeat, all in 10 seconds. I find Zeos components and now I'm migrating the database. But now creating the database spent 5 minutes. I test several things but doesn't work, for example

Executing all commands in this sequence

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   ZConsultaBD.SQL.Clear;
   ZConsultaBD.SQL.Add(comandoSQL);
   ZConsultaBD.Open;

Make an script for the commands

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   ZProcesoBD.Script.Clear;
   ZProcesoBD.Script.Add(comandoSQL+';');
   ZProcesoBD.Execute;

I test also execute ZProcesoBD.Script.Clear before the generator loop and ZProcesoBD.Execute after the loop. Worst results.

I have these relations and definitions:

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    ZConexionBD.Database:=ficheroBaseDatos;
    ZConexionBD.Protocol:='sqlite-3';
    ZConexionBD.Connected:=TRUE;
    ZConsultaBD.Connection:=ZConexionBD;
    ZProcesoBD.Connection:=ZConexionBD;

¿Somebody can tell me what is wrong? Or ¿Can tell me what is missing to optimize the queries? Thanks. I'm working with Delphi 2005.

Posted: **05.03.2009, 07:19**

Try to write the records in a single transaction otherwise there will be a fsync on every write of a record which slows down updating speed. I don't know how it is done in Zeos, MSEgui has a dedicated tmsetransaction component and a slo_transactions flag in tsqlite3connection.options. It is off by default because transactions with Sqlite3 are a little bit tricky to use. A not finished fetch operation locks write operations for example.

Martin

Posted: **05.03.2009, 11:44**

First

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ZConsultaBD.SQL.Text('BEGIN');
ZConsultaBD.Open;

NO work

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ZConexion.StartTransaction;

Last

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ZConsultaBD.SQL.Text('COMMIT');
ZConsultaBD.Open;

Thanks. (Thank you Martin)

Posted: **05.03.2009, 13:16**

Did you Try ZConexion.AutoCommit := false ?

Mark

Zeoslib Portal

Slow creating database

Slow creating database

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