Berkeley DB: DbTxn::set_timeout
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::set_timeout |

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    #include <db_cxx.h>

    u_int32_t
    DbTxn::set_timeout(db_timeout_t timeout, u_int32_t flags);

### Description: DbTxn::set_timeout

The DbTxn::set_timeout method sets timeout values for locks or transactions for the specified transaction.

Timeouts are checked whenever a thread of control blocks on a lock or when deadlock detection is performed. (In the case of DB_SET_LOCK_TIMEOUT, the lock is one requested explicitly through the Lock subsystem interfaces. In the case of DB_SET_TXN_TIMEOUT, the lock is one requested on behalf of a transaction. In either case, it may be a lock requested by the database access methods underlying the application.) As timeouts are only checked when the lock request first blocks or when deadlock detection is performed, the accuracy of the timeout depends on how often deadlock detection is performed.

Timeout values may be specified for the database environment as a whole. See DbEnv::set_timeout and for more information.

The DbTxn::set_timeout method configures operations performed on the underlying transaction, not only operations performed using the specified DbTxn handle.

The DbTxn::set_timeout method may be called at any time during the life of the application.

The DbTxn::set_timeout method either returns a non-zero error value or throws an exception that encapsulates a non-zero error value on failure, and returns 0 on success.

### Parameters

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

  DB_SET_LOCK_TIMEOUT
    Set the timeout value for locks in this transaction.

  DB_SET_TXN_TIMEOUT
    Set the timeout value for this transaction.

timeout
  The timeout parameter is specified as an unsigned 32-bit number of microseconds, limiting the maximum timeout to roughly 71 minutes. A value of 0 disables timeouts for the transaction.

### Errors

The DbTxn::set_timeout method may fail and throw DbException, encapsulating one of the following non-zero errors, or return one of the following non-zero errors:

EINVAL
  An invalid flag value or parameter was specified.

### Class

DbEnv, DbTxn

### See Also

Transaction Subsystem and Related Methods`

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