If you do GUID PK or clustered index in an RDBMS, probably want to turn it into a monotonic GUID. Many DBs order the table by PK. If the GUID value moves back

If you do GUID PK or clustered index in an RDBMS, probably want to turn it into a monotonic GUID. Many DBs order the table by PK. If the GUID value moves backward, that's a slow insert into the middle instead of a fast append to the end. https://dba.stackexchange.com/a/17212 https://dba.stackexchange.com/a/17212