NAME

       mdb - OpenLDAP Lightning Memory-Mapped Database Manager.

SYNOPSIS

   Modules
       Version Macros
       Environment Flags
       Database Flags
       Write Flags

   Data Structures
       struct MDB_val
           Generic structure used for passing keys and data in and out of the database.

   Typedefs
       typedef unsigned int MDB_dbi
           A handle for an individual database in the DB environment.
       typedef int() MDB_cmp_func(const MDB_val *a, const MDB_val *b)
           A callback function used to compare two keys in a database.
       typedef void() MDB_rel_func(MDB_val *item, void *oldptr, void *newptr, void *relctx)
           A callback function used to relocate a position-dependent data item in a fixed-address database.

Detailed Description

       OpenLDAP Lightning Memory-Mapped Database Manager.

Data Structure Documentation

struct MDB_val

       Generic structure used for passing keys and data in and out of the database.

       Values returned from the database are valid only until a subsequent update operation, or the end of the
       transaction. Do not modify or free them, they commonly point into the database itself.

       Key sizes must be between 1 and mdb_env_get_maxkeysize() inclusive. The same applies to data sizes in
       databases with the MDB_DUPSORT flag. Other data items can in theory be from 0 to 0xffffffff bytes long.

   Data Fields

       size_t mv_size
       void * mv_data

Typedef Documentation

   typedef void() MDB_rel_func(MDB_val *item, void *oldptr, void *newptr, void *relctx)
       A callback function used to relocate a position-dependent data item in a fixed-address database. The
       newptr gives the item's desired address in the memory map, and oldptr gives its previous address. The
       item's actual data resides at the address in item. This callback is expected to walk through the fields
       of the record in item and modify any values based at the oldptr address to be relative to the newptr
       address.

       Parameters
           item The item that is to be relocated.
           oldptr The previous address.
           newptr The new address to relocate to.
           relctx An application-provided context, set by mdb_set_relctx().

       Todo
           This feature is currently unimplemented.

Author

       Generated automatically by Doxygen for LMDB from the source code.

LMDB                                             Wed Mar 25 2020                                          mdb(3)