---
name: "slapd-wt"
section: "5"
platform: "linux"
package: "openldap"
version: "2.7.2-2"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/slapd-wt"
---

# slapd-wt(5)

WiredTiger backend to slapd

## NAME

slapd-wt - WiredTiger backend to slapd

## SYNOPSIS

**/etc/openldap/slapd.conf**

## DESCRIPTION

The **wt** backend to [**slapd**(8)](/slapd/8.md) uses WiredTiger database library to store data.

The **wt** backend is experimental module that have potential high write performance and high concurrency performance. This backend have not some basic feature yet. Please backup data using slapcat before update the module.

## CONFIGURATION

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

- **directory** *\<directory\>*

  Specify WiredTiger home directory that containing this database and associated indexes live. A separate directory must be specified for each database. The default is **/var/lib/openldap/openldap-data**.

- **idlcache** *\<boolean\>*

  Use the in-memory idlcache. The default is true.

- **index** {*\<attrlist\>*\|**default**} \[**pres**,**eq**,**approx**,**sub**,*\<special\>*\]

  Specify the indexes to maintain for the given attribute (or list of attributes). Some attributes only support a subset of indexes. If only an *\<attr\>* is given, the indices specified for **default** are maintained. Note that setting a default does not imply that all attributes will be indexed. Also, for best performance, an **eq** index should always be configured for the **objectClass** attribute.

- **mode** *\<integer\>*

  back-wt does not support mode option. use umask instead.

- **wtconfig** {**create**,**cache\_size=512M**,**async=(enabled)**}

  Specify configuration for wiredtiger, This parameter is pass to **wiredtiger\_open**(3).

  - **create**

    create the database if it does not exist.

  - **cache\_size**

    maximum heap memory to allocate for the cache.

  - **async**

    asynchronous operations configuration options. disabled by default.

## ACCESS CONTROL

The **wt** backend honors access control semantics as indicated in [**slapd.access**(5)](/slapd.access/5.md).

## FILES

- **/etc/openldap/slapd.conf**

  default **slapd** configuration file

## SEE ALSO

[**slapd.conf**(5)](/slapd.conf/5.md), [**slapd-config**(5)](/slapd-config/5.md), [**slapd**(8)](/slapd/8.md), [**slapadd**(8)](/slapadd/8.md), [**slapcat**(8)](/slapcat/8.md), [**slapindex**(8)](/slapindex/8.md), [**slapmodify**(8)](/slapmodify/8.md), WiredTiger documentation.

## ACKNOWLEDGEMENTS

**OpenLDAP Software** is developed and maintained by The OpenLDAP Project \<http://www.openldap.org/\>. **OpenLDAP Software** is derived from the University of Michigan LDAP 3.3 Release.   Written by HAMANO Tsukasa \<hamano@osstech.co.jp\>.