B4J Question [jRDC2] with SQLite -> need help with WAL & Pool

Discussion in 'B4J Questions' started by jmon, Sep 20, 2016.

  1. jmon

    jmon Well-Known Member Licensed User


    I am using jRDC2 with SQLite.

    I have already set my SQLite db in PRAGMA journal_mode = wal:

    but I read here:
    that I should set the min & max pool size to 1:
    Dim jo As JavaObject = pool
    Is this correct? Because in my tests, that appeared to slow down the jRDC server.
    If I leave the default value of the pool, it returns results faster when I do multiple queries.

    Also, any other tweaks I could perform to improve the performance? For example, is there a way to cache queries?

    Thanks for your help
  2. Erel

    Erel Administrator Staff Member Licensed User

    Yes. There should only be a single connection at a time.

    The performance should be still quite fast: https://www.b4x.com/android/forum/threads/server-performance-measures.37502/#post-238853

    This is the responsibility of the SQL engine. You can extend jRDC and cache common query results. I recommend you to try first without it.

    The most important optimization is to use indices correctly.
    jmon likes this.
  3. jmon

    jmon Well-Known Member Licensed User

    Thank you, I will do that.

    I'm doing some performance tests, and I can insert 10K rows in 900ms with jRDC2, but on a local network.
    Querying a quite complex statement with multiple JOINs, I get the result in 500ms.
    Querying a simple statement, I get the result in 60ms.

    So that seems quite good.
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