DbEnv::set_mp_max_write API Ref

#include <db_cxx.h>

int DbEnv::set_mp_max_write(int maxwrite, db_timeout_t maxwrite_sleep);

int DbEnv::get_mp_max_write(int *maxwritep, db_timeout_t *maxwrite_sleepp);


Description: DbEnv::set_mp_max_write

The DbEnv::set_mp_max_write method limits the number of sequential write operations scheduled by the library when flushing dirty pages from the cache.

The database environment's maximum number of sequential write operations may also be configured using the environment's DB_CONFIG file. The syntax of the entry in that file is a single line with the string "set_mp_max_write", one or more whitespace characters, and the maximum number of sequential writes and the number of microseconds to sleep, also separated by whitespace characters. Because the DB_CONFIG file is read when the database environment is opened, it will silently overrule configuration done before that time.

The DbEnv::set_mp_max_write method configures a database environment, not only operations performed using the specified DbEnv handle.

The DbEnv::set_mp_max_write 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
maxwrite maxwrite_sleep

Errors

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


EINVAL

Description: DbEnv::get_mp_max_write

The DbEnv::get_mp_max_write method returns the current maximum number of sequential write operations and microseconds to pause.

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

The DbEnv::get_mp_max_write 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
maxwritep maxwrite_sleepp


Class DbEnv, DbMpoolFile
See Also Memory Pools and Related Methods

APIRef

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