0I0Berkeley DB: DbTxnMgr::checkpoint[P

DbTxnMgr::checkpoint





#include <db_cxx.h>

int;DbTxnMgr::checkpoint(u_int32_t kbyte, u_int32_t min) const;





Description



CThe DbTxnMgr::checkpoint method flushes the underlying memory pool,?writes a checkpoint record to the log and then flushes the log.

HIf either kbyte or min is non-zero, the checkpoint is onlyKdone if more than min minutes have passed since the last checkpoint,Jor if more than kbyte kilobytes of log data have been written sincethe last checkpoint.

The DbTxnMgr::checkpoint>method either returns errno or throws an exception that:encapsulates an errno on failure, and 0 on success,+ and DB_INCOMPLETE if there were pages thatmneeded to be written but that DbMpool::sync was unable to write immediately.>In this case, the DbTxnMgr::checkpoint call should be retried.

ŠThe DbTxnMgr::checkpoint method is the underlying method used by the db_checkpoint utility.…See the db_checkpoint utility source code for an example of using DbTxnMgr::checkpointin a POSIX 1003.1 environment.



Errors

[If a fatal error occurs in Berkeley DB, the DbTxnMgr::checkpoint method may fail and eitherIreturn DB_RUNRECOVERY or throw an exception encapsulating DB_RUNRECOVERY,Gat which point all subsequent database calls will also fail in the sameFway. Methods marked as returning errno will, by default, throwHan exception that encapsulates the error information. The default error\behavior can be changed, see DbException.

The DbTxnMgr::checkpoint&method may fail and throw an exceptionKfor any of the errors specified for the following Berkeley DB and C library functions: abort(3), fcntl(3), fflush(3), fprintf(3),free(3), getpid(3),>DbLog::compare,6DbLog::put, malloc(3), memcpy(3),<DbMpool::sync, memset(3), strerror(3),time(3), vfprintf(3),and vsnprintf(3).

%In addition, the DbTxnMgr::checkpoint&method may fail and throw an exceptionor return errnofor the following conditions:

B

EINVAL
An invalid flag value or parameter was specified.







Class

8DbTxnMgr



See Also

@DbTxnMgr::begin,DbTxnMgr::checkpoint,@DbTxnMgr::close,>DbTxnMgr::open,=DbTxnMgr::statandBDbTxnMgr::unlink.
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