I have a TOracleDataSet that has a SELECT
statement that uses several databases eg:

SELECT project_no
FROM ledger l
UNION
SELECT project_no
FROM ledger@db.melbourne.home.com l
UNION
SELECT project_no
FROM ledger@db.sydney.home.com l

This query's results are used in a Quick Report. However, after the report has been closed, a transaction TX lock that Oracle created is not released. From reading around I believe that it is necessary to commit even SELECT statements due to two-phase commit used for distributed databases.

However, have tried using the OracleSession.Commit directly after opening the query but this has no affect.

Any advice greatly appreciated.

A TOracleSession.Commit should do the trick. Note that if the dataset fetches new records (e.g. a refresh), Oracle will start a new transaction due to the database link.

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Marco Kalter
Allround Automations

Thanks very much. The query had a master,so I put a TOracleSession.Commit in the AfterPrint of the master query's report band and hey presto!