Examples of com.db4o.config.Configuration.blockSize()

com.db4o.config.Configuration.blockSize()
sets the storage data blocksize for new ObjectContainers.

The standard setting is 1 allowing for a maximum database file size of 2GB. This value can be increased to allow larger database files, although some space will be lost to padding because the size of some stored objects will not be an exact multiple of the block size. A recommended setting for large database files is 8, since internal pointers have this length.

This setting is only effective when the database is first created, in client-server environment in most cases it means that the setting should be used on the server side. @param bytes the size in bytes from 1 to 127

     * Add our own hook to rollback and close... */
    dbConfig.automaticShutDown(false);
    /* Block size 8 should have minimal impact since pointers are this
     * long, and allows databases of up to 16GB.
     * FIXME make configurable by user. */
    dbConfig.blockSize(8);
    dbConfig.diagnostic().addListener(new DB4ODiagnosticListener());


    dbConfig.exceptionsOnNotStorable(false);


    System.err.println("Optimise native queries: "+dbConfig.optimizeNativeQueries());

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      /* Open Source DB */
      sourceDb = Db4o.openFile(createConfiguration(true), source.getAbsolutePath());


      Configuration destinationDbConfiguration = createConfiguration(true);
      if (useLargeBlockSize)
        destinationDbConfiguration.blockSize(LARGE_DB_BLOCK_SIZE);


      /* Open Destination DB */
      destinationDb = Db4o.openFile(destinationDbConfiguration, destination.getAbsolutePath());


      /* Copy (Defragment) */

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    //efficient startup. For example, the following could be used. We'd have
    //to include a file when we need to evolve the schema or something similar
    //config.detectSchemaChanges(false)


    if (getLargeBlockSizeMarkerFile().exists())
      config.blockSize(LARGE_DB_BLOCK_SIZE); //The DB has been migrated to a larger block size


    config.setOut(new PrintStream(new ByteArrayOutputStream()) {
      @Override
      public void write(byte[] buf, int off, int len) {
        if (buf != null && len >= 0 && off >= 0 && off <= buf.length - len)

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