I have a SELECT query using several WITH blocks. Sometimes it runs successfully. Very often it fails with the error "Lookup Error - Oracle Database Error: ORA-32696: HTI: No free slot". I Googled the error, but the only advice is to "Increase memory". There are several discussion boards where people metion this error and ask what memory needs to be increased. I am not a DBA and cannot increase any memory allotments. I contacted my DBA and she said my only option was to try to optimize my query. Does anyone know specifically what causes this error?