0I*Berkeley DB: txn_checkpoint[P

txn_checkpoint





#include <db.h>

int%txn_checkpoint(const DB_TXNMGR *txnp,$ u_int32_t kbyte, u_int32_t min);





Description



?The txn_checkpoint function 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 txn_checkpointDfunction returns the value of errno on failure, 0 on success,+ and DB_INCOMPLETE if there were pages thatgneeded to be written but that memp_sync was unable to write immediately.8In this case, the txn_checkpoint call should be retried.

ˆThe txn_checkpoint function is the underlying function used by the db_checkpoint utility.See the db_checkpoint utility source code for an example of using txn_checkpointin a POSIX 1003.1 environment.



Errors

WIf a fatal error occurs in Berkeley DB, the txn_checkpoint function may fail and returnFDB_RUNRECOVERY, at which point all subsequent database calls will alsoreturn DB_RUNRECOVERY.

The txn_checkpoint)function may fail and return errnoKfor 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),9log_compare,1log_put, malloc(3), memcpy(3),6memp_sync, memset(3), strerror(3),time(3), vfprintf(3),and vsnprintf(3).

In addition, the txn_checkpoint)function may fail and return errnofor the following conditions:

B

EINVAL
An invalid flag value or parameter was specified.







See Also

5txn_abort,8txn_begin,txn_checkpoint,8txn_close,7txn_commit,/txn_id,6txn_open,9txn_prepare,5txn_statand:txn_unlink.
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