Getting Started with Transactional Data Store Applications

• Opening the Environment

  Use DB_ENV->open() to initialize the database environment. Once the application has called DB_ENV->open(), it opens its databases within the environment. The application then makes changes to the databases inside of transactions. Note that the databases accessed by a transaction must not be closed during the transaction.

  Once all outstanding transactions are finished, all open Berkeley DB files should be closed. After that the environment should be closed by calling DB_ENV->close(). For more information, see Opening the environment.

• Opening the Databases

  For information on opening databases in the database environment, see Opening the databases.

• Using a Transaction

  There are a number of reasons to include transactional support in your applications. The most common ones are the following:

  • Recoverability

    For more information, see Recoverability and deadlock handling.

  • Atomicity

    For more information, see Atomicity.

  • Isolation

    For more information, see Isolation.

• Using Transactional Cursor

  Berkeley DB cursors may be used inside a transaction, just like any other database method. The enclosing transaction ID must be specified when the cursor is created, but it does not need to be further specified on operations performed using the cursor. Note that a cursor must be closed before the enclosing transaction is committed or aborted. For more information, see Transactional cursors.