We have an overnight job that runs a number of text queries against the
database (WHERE contains('x','y')>0)

Occasionally, one or more of these queries generates an error -

ORA-29903: error in executing ODCIIndexFetch() routine
ORA-20000: ConText error: DRG-50857: oracle error in drekrgm (reselect
rowid row locator)
ORA-01054: user storage address cannot be written

When we retry the query in the morning it works OK. Any ideas on where we
should start looking?

Alan Brown
Millstream Associates Limited