Error on large select statement

[Rob Benton]

Got DBI version 1.3.5 (not sure which version DBD::Oracle.  Is there a 
way to tell?) on RedHat AS 2.1.

I need some advice.  I'm doing an oracle query on a table that has over 
23 million records and I keep running into this error near the end.  I'm 
not doing any updates, only a select.

PrintError, RaiseError are on and AutoCommit is off.
DBD::Oracle::st fetchrow_array failed: ORA-01555: snapshot too old: 
rollback segment number 19 with name "_SYSSMU19$" too small (DBD ERROR: 
OCIStmtFetch) at ./group_bb.pl line 144.