Hi Gus > Is there some other documentation that I should be looking in? > Wasn't there once upopn a time a Working Aid that decrypted all > the kg*, kc*, kl* modules with at least a good guess about > their function and usage. Have a look to the following MOS note: ORA-600 Lookup Error Categories [ID 175982.1] HTH Chris Antognini Troubleshooting Oracle Performance, Apress 2008 http://top.antognini.ch -- //www.freelists.org/webpage/oracle-l