sql - Oracle snapshot too old and DBLINK -


i getting

ora-01555: snapshot old: rollback segment number 234 name "_syssmu234_1378897836$"

too smal while selecting data using dblink in oracle database.

select a,b localtab union select a,b rmottab@remotedb;

is there way override error?
have situation take data in periodical manner.

you need close cursor when finished retrieving data. problem holding cursor open long. there tons of reasons that: - row-by-row processing on client side. take forever finish. (the database waiting deliver data client) hint. arraysize (fetchsize) set low. arraysize of 100-200 can speed things up. - there nice view hidden behind "rmotab" takes > 30 minutes return burning cpu (logical reads)

basically, have these options:

  1. speed process. (end cursor (query) faster). bulk load.
  2. schedule process happen when no dml going on.
  3. materialized view (pre-load data (read-only))
  4. increase undo.

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