Examples of com.sleepycat.je.DatabaseConfig

com.sleepycat.je.DatabaseConfig

Specifies the attributes of a database.

There are two groups of database attributes: per-database handle attributes, and database-wide attributes. An attribute may be persistent/transient or mutable/immutable:

Scope	Mutable	Persistent	Attribute
Database-wide attribute	True	True	{@link DatabaseConfig#getBtreeComparator() btree comparator} {@link DatabaseConfig#getDuplicateComparator() duplicate comparator} {@link DatabaseConfig#getKeyPrefixing() key prefixing} {@link DatabaseConfig#getNodeMaxEntries() nodeMaxEntries}
	True	False	{@link DatabaseConfig#getDeferredWrite() deferred write} {@link DatabaseConfig#getTransactional() transactional}
	False	True	{@link DatabaseConfig#getSortedDuplicates() sorted duplicates}
	False	False	{@link DatabaseConfig#getTemporary() temporary}
Per-database handle attributes	False	False	{@link DatabaseConfig#getAllowCreate() allow create} {@link DatabaseConfig#getExclusiveCreate() exclusive create} {@link DatabaseConfig#getReadOnly() read only} {@link DatabaseConfig#getUseExistingConfig() use existing config}

Persistent attributes will be saved in the log and remain in effect every time the environment is reopened. Transient attributes only remain in effect until:

the database configuration is updated
the database handle(per-database handle attributes) is closed, or all handles for this database (database-wide attributes) are closed.

    public void testDupInitialized()
        throws DatabaseException {


        /* Open db. */
        initEnv(false);
        DatabaseConfig dbConfig = new DatabaseConfig();
        dbConfig.setAllowCreate(true);
        Database myDb = exampleEnv.openDatabase(null, "fooDb", dbConfig);


        /* Open uninitialized cursor. */
        Cursor c1 = myDb.openCursor(null, null);
        try {

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       * comes before ckptStart.
       */
            Transaction txn1 = env.beginTransaction(null, null);
      DatabaseEntry key = new DatabaseEntry(new byte[] { 1, 2, 3, 4 });
      DatabaseEntry data = new DatabaseEntry(new byte[] { 4, 3, 2, 1 });
      DatabaseConfig dbConfig = new DatabaseConfig();
      dbConfig.setAllowCreate(true);
      dbConfig.setSortedDuplicates(false);
      dbConfig.setTransactional(true);
            Database otherDb = env.openDatabase(txn1, "extradb", dbConfig);
      otherDb.put(txn1, key, data);


            /* Delete all and abort. */
            txn = env.beginTransaction(null, null);

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       * comes before ckptStart.
       */
            Transaction txn1 = env.beginTransaction(null, null);
      DatabaseEntry key = new DatabaseEntry(new byte[] { 1, 2, 3, 4 });
      DatabaseEntry data = new DatabaseEntry(new byte[] { 4, 3, 2, 1 });
      DatabaseConfig dbConfig = new DatabaseConfig();
      dbConfig.setAllowCreate(true);
      dbConfig.setSortedDuplicates(false);
      dbConfig.setTransactional(true);
            Database otherDb = env.openDatabase(txn1, "extradb", dbConfig);
      otherDb.put(txn1, key, data);


            /* Delete all and abort. */
            txn = env.beginTransaction(null, null);

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        try {
            /* Make Dbs, abort */
            Transaction txn = env.beginTransaction(null, null);


            DatabaseConfig dbConfig = new DatabaseConfig();
            dbConfig.setTransactional(true);
            dbConfig.setAllowCreate(true);
            for (int i = 0; i < N2; i++) {
                Database db = env.openDatabase(txn, dbName1 + i, dbConfig);
            }
            txn.abort();

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        /*
         * Create a log file full of LNs, DeletedDupLNs, MapLNs and Debug
         * Records
         */
        DatabaseConfig dbConfig = new DatabaseConfig();
        dbConfig.setAllowCreate(true);
        db = env.openDatabase(null, "foo", dbConfig);
        LogManager logManager = envImpl.getLogManager();


        long lsn;
        Txn userTxn = new Txn(envImpl, new TransactionConfig());

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        }
        String dbName = (String)params[2];


        Database db = null;
        try {
            DatabaseConfig dbConfig = new DatabaseConfig();
            dbConfig.setReadOnly(true);
            DbInternal.setUseExistingConfig(dbConfig, true);
            db = targetEnv.openDatabase(null, dbName, dbConfig);
            return db.getStats(getStatsConfig(params));
        } finally {
            if (db != null) {

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        openEnv();


        /* Write db0 and db1. */
        for (int i = 0; i < 2; i += 1) {
            DatabaseConfig dbConfig = new DatabaseConfig();
            dbConfig.setAllowCreate(true);
            dbConfig.setSortedDuplicates(true);
            Database db = env.openDatabase(null, "db" + i, dbConfig);


            /* Write: {0, 0}, {0, 1}, {1, 0}, {2, 0}, {3, 0} */
            for (int j = 0; j < N_ENTRIES; j += 1) {
                db.put(null, entry(j), entry(0));

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     * First and only record in db1 should be {3,0}.
     */
    private void checkFirstRecord()
        throws DatabaseException {


        DatabaseConfig dbConfig = new DatabaseConfig();
        dbConfig.setAllowCreate(false);
        dbConfig.setReadOnly(true);
        dbConfig.setSortedDuplicates(true);
        Database db = env.openDatabase(null, "db1", dbConfig);
        Cursor cursor = db.openCursor(null, null);
        DatabaseEntry key = new DatabaseEntry();
        DatabaseEntry data = new DatabaseEntry();
        OperationStatus status = cursor.getFirst(key, data, null);

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      envConfig.setCacheSize(100000);
      envConfig.setConfigParam("java.util.logging.level", "OFF");
      env = new Environment(envHome, envConfig);


      String databaseName = "ioexceptiondb";
      DatabaseConfig dbConfig = new DatabaseConfig();
      dbConfig.setAllowCreate(true);
      dbConfig.setSortedDuplicates(true);
      dbConfig.setTransactional(true);
      db = env.openDatabase(null, databaseName, dbConfig);
  
      Transaction txn = env.beginTransaction(null, null);
      DatabaseEntry oneKey =
    (dupes ?

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      envConfig.setConfigParam("java.util.logging.level", "OFF");
  }
  env = new Environment(envHome, envConfig);


        String databaseName = "ioexceptiondb";
        DatabaseConfig dbConfig = new DatabaseConfig();
        dbConfig.setAllowCreate(true);
        dbConfig.setSortedDuplicates(true);
  dbConfig.setTransactional(true);
        db = env.openDatabase(null, databaseName, dbConfig);
    }

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