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From "Thomas Dudziak" <tom...@gmail.com>
Subject Re: DatabaseToDdl schemapattern -> writeDataToFile
Date Thu, 22 May 2008 16:22:29 GMT
On Wed, May 21, 2008 at 10:24 AM, Lubomir Sterba
<lubomir.sterba@swlab.eu> wrote:
> Hello,
> as I write in previous mail, we try to export relatively bigger database
> with DdlUtils and migrate it from Oracle to  PostgresSQL. After some
> problems with ant tasks and schema definition (which are probably given by
> bug in Oracle JDBC driver I think) we use DdlUtils Java API end export table
> data table per table. After that quick operation we try to import data to
> Postgres using Ddl API DataReader. And that was a big problem, table with
> cca 1M records dont import after cca 8 hours. And this situation  force us
> after profiling DdwlUtils code where  cca 50% of CPU  time was spend in
> commons-digester code to write own  SAX based import. It is now now in
>  state can be published (converting datatypes written only for our purposes,
> etc), bud  1M records inserts in two minutes opposite many hours with
> digester API used by DataReader (we drop constraints and indexes and after
> data load we will build them with Ddlutils). DdlUtils are superlative in
> data structure manipulation, but with data manipulation I think there are
> some lack for bigger databases (cca 10GB gzipped in DdlUtils .xml). But
> there are many workarounds to use this tool and evaluate it very usefull.
> Many thanks to authors
> Lubos

Feel free to file an issue in DdlUtils' JIRA and attach a patch there,
I'd be happy to look at it and incorporate your performance
improvements into DdlUtils.


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