Berkeley DB: DB_ENV->set_lg_regionmax
Description: Berkeley DB: An embedded database programmatic toolkit.
Keywords: embedded,database,programmatic,toolkit,b+tree,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);

# Description

Set the size of the underlying logging subsystem region, in bytes. By default, or if the value is set to 0, the base region size is 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 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 interface may not be called after the DB_ENV->open interface 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.

The database environment's log region size may also be set 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.

# Errors

The DB_ENV->set_lg_regionmax method may fail and return a non-zero error for the following conditions:

EINVAL
  An invalid flag value or parameter was specified.

  Called after DB_ENV->open was called.

The DB_ENV->set_lg_regionmax method may fail and return a non-zero error for errors specified for other Berkeley DB and C library or system functions. If a catastrophic error has occurred, the DB_ENV->set_lg_regionmax method may fail and return DB_RUNRECOVERY, in which case all subsequent Berkeley DB calls will fail in the same way.

# Class

DB_ENV, DB_LOGC, DB_LSN

# See Also

Logging Subsystem and Related Methods`

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