mdb manpage

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+.TH SLAPD-MDB 5 "RELEASEDATE" "OpenLDAP LDVERSION"
+.\" Copyright 2011 The OpenLDAP Foundation All Rights Reserved.
+.\" Copying restrictions apply.  See COPYRIGHT/LICENSE.
+.\" $OpenLDAP$
+.SH NAME
+slapd\-mdb \- Memory-Mapped DB backend to slapd
+.SH SYNOPSIS
+.B ETCDIR/slapd.conf
+.SH DESCRIPTION
+The \fBmdb\fP backend to
+.BR slapd (8)
+uses OpenLDAP's own Memory-Mapped DB (MDB) library to store data.
+It relies completely on the underlying operating system for memory
+management and does no caching of its own.
+.LP
+The \fBmdb\fP backend is similar to the \fBhdb\fP backend in that
+it uses a hierarchical database layout which
+supports subtree renames. It is both more space-efficient and more
+execution-efficient than the \fBbdb\fP backend, while being overall
+much simpler to manage.
+.SH CONFIGURATION
+These
+.B slapd.conf
+options apply to the \fBmdb\fP backend database.
+That is, they must follow a "database mdb" line and
+come before any subsequent "backend" or "database" lines.
+Other database options are described in the
+.BR slapd.conf (5)
+manual page.
+.TP
+.BI checkpoint \ <kbyte>\ <min>
+Specify the frequency for flushing the database disk buffers.
+This setting is only needed if the \fBdbnosync\fP option is used.
+Note: this feature is not yet implemented.
+The checkpoint will occur if either \fI<kbyte>\fP data has been written or
+\fI<min>\fP minutes have passed since the last checkpoint.
+Both arguments default to zero, in which case they are ignored. When
+the \fI<min>\fP argument is non-zero, an internal task will run every 
+\fI<min>\fP minutes to perform the checkpoint.
+.TP
+.B dbnosync
+Specify that on-disk database contents should not be immediately
+synchronized with in memory changes.
+Enabling this option may improve performance at the expense of data
+security. By default, a full data flush/sync is performed when each
+transaction is committed.
+.TP
+.BI directory \ <directory>
+Specify the directory where the MDB files containing this database and
+associated indexes live.
+A separate directory must be specified for each database.
+The default is
+.BR LOCALSTATEDIR/openldap\-data .
+.TP
+\fBindex \fR{\fI<attrlist>\fR|\fBdefault\fR} [\fBpres\fR,\fBeq\fR,\fBapprox\fR,\fBsub\fR,\fI<special>\fR]
+Specify the indexes to maintain for the given attribute (or
+list of attributes).
+Some attributes only support a subset of indexes.
+If only an \fI<attr>\fP is given, the indices specified for \fBdefault\fR
+are maintained.
+Note that setting a default does not imply that all attributes will be
+indexed. Also, for best performance, an
+.B eq
+index should always be configured for the
+.B objectClass
+attribute.
+
+A number of special index parameters may be specified.
+The index type
+.B sub
+can be decomposed into
+.BR subinitial ,
+.BR subany ,\ and
+.B subfinal
+indices.
+The special type
+.B nolang
+may be specified to disallow use of this index by language subtypes.
+The special type
+.B nosubtypes
+may be specified to disallow use of this index by named subtypes.
+Note: changing \fBindex\fP settings in 
+.BR slapd.conf (5)
+requires rebuilding indices, see
+.BR slapindex (8);
+changing \fBindex\fP settings
+dynamically by LDAPModifying "cn=config" automatically causes rebuilding
+of the indices online in a background task.
+.TP
+.BI maxsize \ <bytes>
+Specify the maximum size of the database in bytes. A memory map of this
+size is allocated at startup time and the database will not be allowed
+to grow beyond this size. The default is 10487560 bytes. This setting
+may be changed upward if the configured limit needs to be increased.
+.TP
+.BI mode \ <integer>
+Specify the file protection mode that newly created database 
+files should have.
+The default is 0600.
+.TP
+.BI searchstack \ <depth>
+Specify the depth of the stack used for search filter evaluation.
+Search filters are evaluated on a stack to accommodate nested AND / OR
+clauses. An individual stack is assigned to each server thread.
+The depth of the stack determines how complex a filter can be
+evaluated without requiring any additional memory allocation. Filters that
+are nested deeper than the search stack depth will cause a separate
+stack to be allocated for that particular search operation. These
+allocations can have a major negative impact on server performance,
+but specifying too much stack will also consume a great deal of memory.
+Each search stack uses 512K bytes per level. The default stack depth
+is 16, thus 8MB per thread is used.
+.SH ACCESS CONTROL
+The 
+.B mdb
+backend honors access control semantics as indicated in
+.BR slapd.access (5).
+.SH FILES
+.TP
+.B ETCDIR/slapd.conf
+default 
+.B slapd 
+configuration file
+.SH SEE ALSO
+.BR slapd.conf (5),
+.BR slapd\-config (5),
+.BR slapd (8),
+.BR slapadd (8),
+.BR slapcat (8),
+.BR slapindex (8),
+OpenLDAP MDB documentation.
+.SH ACKNOWLEDGEMENTS
+.so ../Project
+Written by Howard Chu.