Berkeley DB: DB_ENV->set_cache_max
Description: Berkeley DB: An embedded database programmatic toolkit.
Keywords: embedded,database,programmatic,toolkit,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,Java,C,C++

### DB_ENV->set_cache_max |

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###

    #include <db.h>

    int
    DB_ENV->set_cache_max(DB_ENV *dbenv, u_int32_t gbytes, u_int32_t bytes);

    int
    DB_ENV->get_cache_max(DB_ENV *dbenv, u_int32_t *gbytesp, u_int32_t *bytesp);

### Description: DB_ENV->set_cache_max

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.

### Parameters

mp_mmapsize
  The mp_mmapsize parameter is the maximum file size, in bytes, for a file to be mapped into the process address space.

### Errors

The DB_ENV->set_cache_max method may fail and return one of the following non-zero errors:

EINVAL
  If the method was called after DB_ENV->open was called; or if an invalid flag value or parameter was specified.

### Description: DB_ENV->get_cache_max

The DB_ENV->get_cache_max method returns the maximum size of the cache.

The DB_ENV->get_cache_max method may be called at any time during the life of the application.

The DB_ENV->get_cache_max method returns a non-zero error value on failure and 0 on success.

### Parameters

bytesp
  The bytesp parameter references memory into which the additional bytes of memory in the cache is copied.
gbytesp
  The gbytesp parameter references memory into which the gigabytes of memory in the cache is copied.

### Class

DB_ENV

### See Also

Database Environments and Related Methods`

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