DbEnv::get_backup_config()

#include <db_cxx.h>
 
DB_ENV->get_backup_config(DB_BACKUP_CONFIG option, u_int32_t *valuep);

The DbEnv::get_backup_config() method retrieves the value set for hot backup tuning parameters. See the DbEnv::backup() and DbEnv::dbbackup() methods for a description of the hot backup APIs. These tuning parameters can be set using the DbEnv::set_backup_config() method.

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

The DbEnv::get_backup_config() 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

option

The option parameter identifies the backup parameter to be retrieved. It must be one of the following:

  • DB_BACKUP_WRITE_DIRECT

    Turning this on causes direct I/O to be used when writing pages to the disk.

  • DB_BACKUP_READ_COUNT

    Configures the number of pages to read before pausing.

  • DB_BACKUP_READ_SLEEP

    Configures the number of microseconds to sleep between batches of reads.

  • DB_BACKUP_SIZE

    Configures the size of the buffer, in megabytes, to read from the database.

valuep

The valuep parameter references memory into which is copied the current value of the backup tuning parameter identified by the option parameter.

Class

DbEnv,

See Also

Database Environments and Related Methods, DbEnv::set_backup_config() , DbEnv::backup() , DbEnv::dbbackup()