Berkeley DB: DbTxn.commit
Description: Berkeley DB: An embedded database programmatic toolkit.
Keywords: embedded,database,programmatic,toolkit,b+tree,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,java,C,C++

# DbTxn.commit |

`

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    import com.sleepycat.db.*;

    public void commit(u_int32_t flags)
    	throws DbException;

# Description

The DbTxn.commit method ends the transaction.

In the case of nested transactions, if the transaction is a parent transaction with unresolved (neither committed or aborted) child transactions, the child transactions are aborted and the commit of the parent will succeed.

In the case of nested transactions, if the transaction is a child transaction, its locks are not released, but are acquired by its parent. While the commit of the child transaction will succeed, the actual resolution of the child transaction is postponed until the parent transaction is committed or aborted, i.e., if its parent transaction commits, it will be committed, and if its parent transaction aborts, it will be aborted.

If Db.DB_TXN_NOSYNC is not specified, a commit log record is written and flushed to disk, as are all previously written log records.

The flags parameter must be set to 0 or one of the following values:

Db.DB_TXN_NOSYNC
  Do not synchronously flush the log. This means the transaction will exhibit the ACI (atomicity, consistency and isolation) properties, but not D (durability), i.e., database integrity will be maintained but it is possible that this transaction may be undone during recovery instead of being redone.

  This behavior may be set for an entire Berkeley DB environment as part of the DbEnv.open interface.

Db.DB_TXN_SYNC
  Synchronously flush the log. This means the transaction will exhibit all of the ACID (atomicity, consistency and isolation and durability) properties.

  This behavior is the default for Berkeley DB environments unless the Db.DB_TXN_NOSYNC flag was specified to the DbEnv.open or DbEnv.txn_begin interfaces.

The DbTxn.commit method throws an exception that encapsulates a non-zero error value on failure.

# Errors

If a fatal error occurs in Berkeley DB, the DbTxn.commit method will fail and throw a DbRunRecoveryException, at which point all subsequent database calls will fail in the same way.

In addition, the DbTxn.commit method may fail and throw an exception encapsulating a non-zero error for the following conditions:

EINVAL
  The transaction was already aborted.

In addition, the DbTxn.commit method may fail and throw an exception for errors specified for other Berkeley DB and C library or system methods.

### Classes

DbEnv, DbTxn

# See Also

DbEnv.set_tx_max, DbTxn.abort, DbEnv.txn_begin, DbEnv.txn_checkpoint, DbTxn.commit, DbTxn.id, DbTxn.prepare and DbEnv.txn_stat.`

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