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42.38. pg_prepared_xacts

The view pg_prepared_xacts displays information about transactions that are currently prepared for two-phase commit (see PREPARE TRANSACTION for details).

pg_prepared_xacts contains one row per prepared transaction. An entry is removed when the transaction is committed or rolled back.

Table 42-38. pg_prepared_xacts Columns

Name Type References Description
transaction xid   Numeric transaction identifier of the prepared transaction
gid text   Global transaction identifier that was assigned to the transaction
prepared timestamp with time zone   Time at which the transaction was prepared for commit
owner name pg_authid .rolname Name of the user that executed the transaction
database name pg_database .datname Name of the database in which the transaction was executed

When the pg_prepared_xacts view is accessed, the internal transaction manager data structures are momentarily locked, and a copy is made for the view to display. This ensures that the view produces a consistent set of results, while not blocking normal operations longer than necessary. Nonetheless there could be some impact on database performance if this view is read often.

  Published courtesy of The PostgreSQL Global Development Group Design by Interspire