Am Freitag, 3. Dezember 2004 13:18 schrieb Mª José Sempere: > We've created a table with a bytea type field. > We'd like having no more than one row with identical content > In that field. So, we've declared a unique index on that field. > We'd like to know if in tables with a lot of rows the existence of that > index will slow the insertion of new rows
Yes. > (perhaps because before inserting > it must compare that field with the content of the same bytea field > For all the existing rows in the table). Not with all rows, since it's a B-tree index, but with some rows for sure. > We'd also like to know how does PostgreSql implement that comparation > Between bytea fields (if it compares all the content of the field, Yes. -- Peter Eisentraut http://developer.postgresql.org/~petere/ ---------------------------(end of broadcast)--------------------------- TIP 7: don't forget to increase your free space map settings
