Berkeley DB: DB_ENV->set_lg_regionmax
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_lg_regionmax |

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    #include <db.h>

    int
    DB_ENV->set_lg_regionmax(DB_ENV *dbenv, u_int32_t lg_regionmax);

    int
    DB_ENV->get_lg_regionmax(DB_ENV *dbenv, u_int32_t *lg_regionmaxp);

Description: DB_ENV->set_lg_regionmax

Set the size of the underlying logging area of the Berkeley DB environment, in bytes. By default, or if the value is set to 0, the default size is approximately 60KB. The log region is used to store filenames, and so may need to be increased in size if a large number of files will be opened and registered with the specified Berkeley DB environment's log manager.

The database environment's log region 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_lg_regionmax", 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_lg_regionmax method configures a database environment, not only operations performed using the specified DB_ENV handle.

The DB_ENV->set_lg_regionmax method may not be called after the DB_ENV->open method is called. If the database environment already exists when DB_ENV->open is called, the information specified to DB_ENV->set_lg_regionmax will be ignored.

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

Parameters
lg_regionmax

- The lg_regionmax parameter is the size of the logging area in the Berkeley DB environment, in bytes.

Errors

The DB_ENV->set_lg_regionmax 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_lg_regionmax

The DB_ENV->get_lg_regionmax method returns the size of the underlying logging subsystem region.

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

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

Parameters
lg_regionmaxp

- The DB_ENV->get_lg_regionmax method returns the size of the underlying logging subsystem region in lg_regionmaxp.

Class DB_ENV, DB_LOGC, DB_LSN
See Also Logging Subsystem and Related Methods`

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