Amazon Redshift will no longer support the creation of new Python UDFs starting November 1, 2025.
If you would like to use Python UDFs, create the UDFs prior to that date.
Existing Python UDFs will continue to function as normal. For more information, see the
blog post
SVV_TRANSACTIONS
Records information about transactions that currently hold locks on tables in the database. Use the SVV_TRANSACTIONS view to identify open transactions and lock contention issues. For more information about locks, see Managing concurrent write operations and LOCK.
SVV_TRANSACTIONS is visible to all users. Superusers can see all rows; regular users can see only their own data. For more information, see Visibility of data in system tables and views.
Table columns
| Column name | Data type | Description |
|---|---|---|
| txn_owner | text | Name of the owner of the transaction. |
| txn_db | text | Name of the database associated with the transaction. |
| xid | bigint | Transaction ID. |
| pid | integer | Process ID associated with the lock. |
| txn_start | timestamp | Start time of the transaction. |
| lock_mode | text | Name of the lock mode held or requested by this
process. If lock_mode is ExclusiveLock and
granted is true (t), then this
transaction ID is an open transaction. |
| lockable_object_type | text | Type of object requesting or holding the lock,
either relation if it is a table or
transactionid if it is a transaction. |
| relation | integer | Table ID for the table (relation) acquiring the
lock. This value is NULL if lockable_object_type is
transactionid. |
| granted | boolean | Value that indicates whether that the lock has
been granted (t) or is pending (f)
. |
Sample queries
The following command shows all active transactions and the locks requested by each transaction.
select * from svv_transactions; txn_ lockable_ owner | txn_db | xid | pid | txn_start | lock_mode | object_type | relation | granted -------+--------+--------+-------+----------------------------+---------------------+----------------+----------+--------- root | dev | 438484 | 22223 | 2016-03-02 18:42:18.862254 | AccessShareLock | relation | 100068 | t root | dev | 438484 | 22223 | 2016-03-02 18:42:18.862254 | ExclusiveLock | transactionid | | t root | tickit | 438490 | 22277 | 2016-03-02 18:42:48.084037 | AccessShareLock | relation | 50860 | t root | tickit | 438490 | 22277 | 2016-03-02 18:42:48.084037 | AccessShareLock | relation | 52310 | t root | tickit | 438490 | 22277 | 2016-03-02 18:42:48.084037 | ExclusiveLock | transactionid | | t root | dev | 438505 | 22378 | 2016-03-02 18:43:27.611292 | AccessExclusiveLock | relation | 100068 | f root | dev | 438505 | 22378 | 2016-03-02 18:43:27.611292 | RowExclusiveLock | relation | 16688 | t root | dev | 438505 | 22378 | 2016-03-02 18:43:27.611292 | AccessShareLock | relation | 100064 | t root | dev | 438505 | 22378 | 2016-03-02 18:43:27.611292 | AccessExclusiveLock | relation | 100166 | t root | dev | 438505 | 22378 | 2016-03-02 18:43:27.611292 | AccessExclusiveLock | relation | 100171 | t root | dev | 438505 | 22378 | 2016-03-02 18:43:27.611292 | AccessExclusiveLock | relation | 100190 | t root | dev | 438505 | 22378 | 2016-03-02 18:43:27.611292 | ExclusiveLock | transactionid | | t (12 rows) (12 rows)