54.17. 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 54.17. pg_prepared_xacts Columns
Column Type Description |
|---|
Numeric transaction identifier of the prepared transaction |
Global transaction identifier that was assigned to the transaction |
Time at which the transaction was prepared for commit |
Name of the user that executed the transaction |
Name of the database in which the transaction was executed |
State of the three-phase commit (used only by multimaster) |
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 frequently accessed.