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DbEnv::set_mp_max_write

API Ref

#include <db_cxx.h>

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

int DbEnv::get_mp_max_write(int *maxwritep, int *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 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
The maximum number of sequential write operations scheduled by the library when flushing dirty pages from the cache.
maxwrite_sleep
The number of microseconds the thread of control should pause before scheduling further write operations.

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
An invalid flag value or parameter was specified.

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
The maxwritep parameter references memory into which the maximum number of sequential write operations is copied.
maxwrite_sleepp
The maxwrite_sleepp parameter references memory into which the microseconds to pause before scheduling further write operations is copied.

Class

DbEnv, DbMpoolFile

See Also

Memory Pools and Related Methods

APIRef

Copyright (c) 1996-2005 Sleepycat Software, Inc. - All rights reserved.