Berkeley DB: DbEnv::set_tx_timestamp
Description: Berkeley DB: An embedded database programmatic toolkit.
Keywords: embedded,database,programmatic,toolkit,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,Java,C,C++

### DbEnv::set_tx_timestamp |

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###

    #include <db_cxx.h>

    int
    DbEnv::set_tx_timestamp(time_t *timestamp);

    int
    DbEnv::get_tx_timestamp(time_t *timestampp);

### Description: DbEnv::set_tx_timestamp

Recover to the time specified by timestamp rather than to the most current possible date.

Once a database environment has been upgraded to a new version of Berkeley DB involving a log format change (see Upgrading Berkeley DB installations), it is no longer possible to recover to a specific time before that upgrade.

The DbEnv::set_tx_timestamp method configures operations performed using the specified DbEnv handle, not all operations performed on the underlying database environment.

The DbEnv::set_tx_timestamp method may not be called after the DbEnv::open method is called.

The DbEnv::set_tx_timestamp 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

timestamp
  The timestamp parameter references the memory location where the recovery timestamp is located.

  The timestamp parameter should be the number of seconds since 0 hours, 0 minutes, 0 seconds, January 1, 1970, Coordinated Universal Time; that is, the Epoch.

### Errors

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

EINVAL
  If it is not possible to recover to the specified time using the log files currently present in the environment; or if an invalid flag value or parameter was specified.

### Description: DbEnv::get_tx_timestamp

The DbEnv::get_tx_timestamp method returns the recovery timestamp.

The DbEnv::get_tx_timestamp method may be called at any time during the life of the application.

The DbEnv::get_tx_timestamp 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

timestampp
  The DbEnv::get_tx_timestamp method returns the recovery timestamp in timestampp.

### Class

DbEnv, DbTxn

### See Also

Transaction Subsystem and Related Methods`

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