Commit 993649b4 authored by Howard Chu's avatar Howard Chu
Browse files

Add back-hdb description

parent 996e8729
......@@ -3,7 +3,7 @@
.\" Copying restrictions apply. See COPYRIGHT/LICENSE.
.\" $OpenLDAP$
.SH NAME
slapd-bdb \- BDB backend to slapd
slapd-bdb, slapd-hdb \- BDB backends to slapd
.SH SYNOPSIS
ETCDIR/slapd.conf
.SH DESCRIPTION
......@@ -15,6 +15,10 @@ it properly.
It uses the Sleepycat Berkeley DB (BDB) package to store data.
It makes extensive use of indexing and caching to speed data access.
.LP
"hdb" is a variant of the BDB backend that uses a hierarchical database
layout which supports subtree renames. It is otherwise identical to
the "bdb" behavior, and all the same configuration options apply.
.LP
It is noted that these options are intended to complement
Berkeley DB configuration options set in the environment's
.B DB_CONFIG
......@@ -28,14 +32,14 @@ take precedence.
These
.B slapd.conf
options apply to the BDB backend database.
That is, they must follow a "database bdb" line and come before any
subsequent "backend" or "database" lines.
That is, they must follow a "database bdb" or "database hdb" line and
come before any subsequent "backend" or "database" lines.
Other database options are described in the
.BR slapd.conf (5)
manual page.
.TP
.B cachesize <integer>
Specify the size in entries of the in-memory cache maintained
Specify the size in entries of the in-memory entry cache maintained
by the BDB backend database instance.
The default is 1000 entries.
.TP
......@@ -76,7 +80,9 @@ will return a different result.
.B idlcachesize <integer>
Specify the size of the in-memory index cache, in index slots. The
default is zero. A larger value will speed up frequent searches of
indexed entries.
indexed entries. An hdb database needs a large idlcachesize
for good search performance, typically three times the entry cache size
or larger.
.TP
.B
index {<attrlist>|default} [pres,eq,approx,sub,<special>]
......
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