What does the slapindex tool do?

While `slapindex` manipulates indexes, its primary function is rebuilding them, not displaying their configuration details; other tools or methods are used for viewing index definitions.

`slapindex` reads the entire LDAP database content and rebuilds all configured indexes from scratch or updates existing ones based on the index definitions in `slapd.conf`. This process is critical for maintaining optimal search performance, particularly after significant data imports, deletions, or structural modifications to the directory.

Displaying DNs or sorting entries is typically performed using the `ldapsearch` utility with appropriate options and filters, not with `slapindex`.

`slapindex` rebuilds indexes, but it does not perform defragmentation of the underlying database files; that functionality is usually handled by the specific database backend (e.g., LMDB, BDB).