Hi Martín,

I have done various tests on replace and delete, but in all cases, delete performed better than replace (see e.g. the attached Java example)..

* Did you already find out more about the causes? * Did you encounter the same behavior without the C# client or rest? * What happens after a full database optimization?

Best, Christian

On Tue, Aug 25, 2015 at 5:16 PM, Martín Ferrari ferrari_martin@hotmail.com wrote:

Sure. I'm using BaseX 8.2.3 on linux, using the C# client located at https://github.com/BaseXdb/basex/blob/master/basex-api/src/main/c%23/BaseXCl.... The DB, as reported by the rest interface:

<rest:database resources="1015172" size="10063643321">mferrari_test_6</rest:database>

This is my simplified test function:

    static void DoSingleDeleteProcessing(string db)
    {
        int localId = 310072;

        BaseXClient.Session baseXClientSession = new

BaseXClient.Session(server, 1984, user, password); baseXClientSession.Execute("open " + db);

        string filename = "prueba" + localId.ToString("D8") + ".xml";
        baseXClientSession.Execute("DELETE " + filename);
        baseXClientSession.Close();
    }

This is what I get in the logs:

17:20:22.253 10.1.5.144:61340 admin REQUEST OPEN mferrari_test_6 39.83 ms 17:20:22.321 10.1.5.144:61340 admin OK Database 'mferrari_test_6' was opened in 68.44 ms. 68.54 ms 17:20:22.324 10.1.5.144:61340 admin REQUEST DELETE prueba00310072.xml 1.47 ms 17:21:20.794 10.1.5.144:61340 admin OK 1 resource(s) deleted in 58469.92 ms. 58469.98 ms

A Replace on the same DB results in the following entries:

17:24:38.070 10.1.5.144:61359 admin REQUEST OPEN mferrari_test_6 39.97 ms 17:24:38.138 10.1.5.144:61359 admin OK Database 'mferrari_test_6' was opened in 67.69 ms. 67.79 ms 17:24:38.170 10.1.5.144:61359 admin REQUEST REPLACE prueba00310071.xml [...] 0.34 ms 17:24:38.548 10.1.5.144:61359 admin OK 0 resource(s) replaced in 377.84 ms. 377.98 ms

Thanks! Martín.

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Subject: Re: [basex-talk] DELETE Performance From: alex@holupirek.de Date: Tue, 25 Aug 2015 09:06:59 +0200 CC: basex-talk@mailman.uni-konstanz.de To: ferrari_martin@hotmail.com

...

Hi Martín,

could you provide a simple, self-contained code snippet that demonstrates this behaviour? This way we could have a look.

Alex

...

On 25.08.2015, at 00:43, Martín Ferrari ferrari_martin@hotmail.com wrote:

Hi: I have a DB with around a million records. Adding resources to it takes some milliseconds. However, executing DELETE on a resource takes more than 60 seconds. Am I doing something wrong? Is this by design?

Thanks! Martín.