#include <db.h> int DB_ENV->set_cache_max(DB_ENV *dbenv, u_int32_t gbytes, u_int32_t bytes);
The DB_ENV->set_cache_max()
method sets the maximum cache size, in
bytes. The specified size is rounded to the nearest multiple of the
cache region size, which is the initial cache size divided by the
number of regions specified to the
DB_ENV->set_cachesize()
method. If no value is specified, it defaults to the initial cache
size.
The database environment's maximum cache size 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_cache_max", one or more whitespace characters, and the size in bytes. Because the DB_CONFIG file is read when the database environment is opened, it will silently overrule configuration done before that time.
The DB_ENV->set_cache_max()
method configures a database environment,
not only operations performed using the specified
DB_ENV handle.
The DB_ENV->set_cache_max()
method may be called at any time during
the life of the application.
The DB_ENV->set_cache_max()
method returns a non-zero error value on failure and 0 on success.
The bytes parameter specifies the number of bytes which, when added to the gbytes parameter, specifies the maximum size of the cache.
The DB_ENV->set_cache_max()
method may fail and return one of the following non-zero errors: