System indexes

The PingDirectory server contains a set of system database index files that ensure that the server operates efficiently. These indexes cannot be modified or deleted.

System Indexes
Index	Description
dn2id	Allows quick retrieval of distinguished names (DNs). The `dn2id` database has one record for each entry. The key is the normalized entry DN and the value is the entry ID.
id2entry	Allows quick retrieval of entries. The `id2entry` database contains the LDAP entries. The database key is the entry ID and the value is the entry contents.
referral	Allows quick retrieval of referrals. The referral database called `dn2uri` contains URIs from referral entries. The key is the DN of the referral entry and the value is that of a labeled URI in the `ref` attribute for that entry.
id2children	Allows quick retrieval of an entry and its children. The `id2children` database provides a mapping between an entry’s unique identifier and the entry unique identifiers of the corresponding entry’s children.
id2subtree	Allows quick retrieval of an entry’s subtree. The `id2subtree` database provides a mapping between an entry’s unique identifier and the unique identifiers in its subtree.

Viewing the system indexes

Steps

To view the system and user indexes, use the dbtest command.

Example:
```
$ bin/dbtest list-index-status --baseDN dc=example,dc=com --backendID userRoot
```
The index status indicates whether or not an index is trusted. An untrusted index requires rebuilding.