pg_prepared_xacts

PostgreSQL 9.5.3 Documentation
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# 49.67. `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 49-68. `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 frequently accessed.

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