DbEnv::memp_trickle()

#include <db_cxx.h>
 
int
DbEnv::memp_trickle(int percent, int *nwrotep);

The DbEnv::memp_trickle() method ensures that a specified percent of the pages in the cache are clean, by writing dirty pages to their backing files.

The purpose of the DbEnv::memp_trickle() function is to enable a memory pool manager to ensure that a page is always available for reading in new information without having to wait for a write.

The DbEnv::memp_trickle() 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

percent

The percent parameter is the percent of the pages in the cache that should be clean.

nwrotep

The nwrotep parameter references memory into which the number of pages written to reach the specified percentage is copied.

Errors

The DbEnv::memp_trickle() method may fail and throw a DbException exception, encapsulating one of the following non-zero errors, or return one of the following non-zero errors: following non-zero errors:

EINVAL

An invalid flag value or parameter was specified.

Class

DbEnv, DbMpoolFile

See Also

Memory Pools and Related Methods