SLAPD-NDB(5)                  File Formats Manual                 SLAPD-NDB(5)

       slapd-ndb - MySQL NDB backend to slapd


       The ndb backend to slapd(8) uses the MySQL Cluster package to store
       data, through its NDB API.  It provides fault tolerance with extreme
       scalability, along with a degree of SQL compatibility.

       This backend is designed to store LDAP information using tables that
       are also visible from SQL. It uses a higher level SQL API for creating
       these tables, while using the low level NDB API for storing and
       retrieving the data within these tables. The NDB Cluster engine allows
       data to be partitioned across multiple data nodes, and this backend
       allows multiple slapd instances to operate against a given database

       The general approach is to use distinct tables for each LDAP object
       class.  Entries comprised of multiple object classes will have their
       data spread across multiple tables. The data tables use a 64 bit
       entryID as their primary key. The DIT hierarchy is maintained in a
       separate table, which maps DNs to entryIDs.

       This backend is experimental. While intended to be a general-purpose
       backend, it is currently missing a number of common LDAP features.  See
       the TODO file in the source directory for details.

       These slapd.conf options apply to the ndb backend database.  That is,
       they must follow a "database ndb" line and come before any subsequent
       "backend" or "database" lines.  Other database options are described in
       the slapd.conf(5) manual page.

       dbhost <hostname>
              The name or IP address of the host running the MySQL server. The
              default is "localhost". On Unix systems, the connection to a
              local server is made using a Unix Domain socket, whose path is
              specified using the dbsocket directive.

       dbuser <username>
              The MySQL login ID to use when connecting to the MySQL server.
              The chosen user must have sufficient privileges to manipulate
              the SQL tables in the target database.

       dbpasswd <password>
              The password for the dbuser.

       dbname <database name>
              The name of the MySQL database to use.

       dbport <port>
              The port number to use for the TCP connection to the MySQL

       dbsocket <path>
              The socket to be used for connecting to a local MySQL server.

       dbflag <integer>
              Client flags for the MySQL session. See the MySQL documentation
              for details.

       dbconnect <connectstring>
              The name or IP address of the host running the cluster manager.
              The default is "localhost".

       dbconnections <integer>
              The number of cluster connections to establish. Using up to 4
              may improve performance under heavier load. The default is 1.

       attrlen <attribute> <length>
              Specify the column length to use for a particular attribute.
              LDAP attributes are stored in individual columns of the SQL
              tables. The maximum column lengths for each column must be
              specified when creating these tables. If a length constraint was
              specified in the attribute's LDAP schema definition, that value
              will be used by default. If the schema didn't specify a
              constraint, the default is 128 bytes.  Currently the maximum is

       index <attr[,attr...]>
              Specify a list of attributes for which indexing should be
              maintained.  Currently there is no support for substring
              indexing; a single index structure provides presence, equality,
              and inequality indexing for the specified attributes.

       attrset <set> <attrs>
              Specify a list of attributes to be treated as an attribute set.
              This directive creates a table named set which will contain all
              of the listed attributes.  Ordinarily an attribute resides in a
              table named by an object class that uses the attribute. However,
              attributes are only allowed to appear in a single table.  For
              attributes that are derived from an inherited object class
              definition, the attribute will only be stored in the superior
              class's table.  Attribute sets should be defined for any
              attributes that are used in multiple unrelated object classes,
              i.e., classes that are not connected by a simple inheritance

       The ndb backend honors most access control semantics as indicated in

              default slapd configuration file

       slapd.conf(5), slapd-config(5), slapd(8), slapadd(8), slapcat(8),
       slapindex(8), MySQL Cluster documentation.

       Howard Chu, with assistance from Johan Andersson et al @ MySQL.

OpenLDAP 2.4.40                   2014/09/20                      SLAPD-NDB(5)