When using the DB Access Module for PostgreSQL, the DB Interface Module class RWDBCursor is implemented using PostgreSQL server text cursors. For writable cursors, the system column, ctid, of PostgreSQL tables, is used as the keyset. The DB Access Module for PostgreSQL doesn't support writable cursors, and therefore updates, deletes, and inserts are performed with separate SQL statements using the same connection as the cursor.
PostgreSQL binary cursors are not supported.
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