Hi Team,

I'm currently working with OpenLDAP (Symas 2.6.7) using the MDB backend, and we've encountered limitations with the length of a single RDN component while importing LDIFs.

**Observed Behavior:** While `MDB_MAXKEYSIZE` is defined as 511 bytes, we found through testing that: - An RDN component (like `uid=...`) of **241 bytes** works - An RDN component of **242 bytes or more** consistently fails with: ldap_add: Other (e.g., implementation specific) error (80) - The full DN length is far below the 8192-byte DN limit, and only the RDN seems to be affected

**Test Environment:** - OpenLDAP version: `Symas 2.6.7` - Backend: `mdb` - OS: `RHEL8`

We confirmed this limit by iteratively creating entries with increasing `uid` lengths and saw consistent breakage at 242 bytes. **Questions:** 1. Is 241 & below bytes the *officially safe practical limit* for a single RDN in LMDB-based OpenLDAP setups? 2. Can we increase the limit?

Reference link: https://www.openldap.org/lists/openldap-technical/201401/msg00239.html

Regards, Anil P