using atomic(), the outer-most call will be wrapped in a transaction, and any nested calls will use savepoints. with db.atomic() as txn: perform_operation() with db.atomic() as nested_txn: perform_another_operation() Peewee supports nested transactions through the use of savepoints (for more information, see savepoint()). Explicit transaction If you wish to explicitly run code in a transaction that you use atomic(). Explicit Savepoints Just as you can explicitly create transactions, you can also explicitly create savepoints using the savepoint() method. Savepoints must occur within a transaction

will use savepoints. with db.atomic() as txn: perform_operation() with db.atomic() as nested_txn: perform_another_operation() Peewee supports nested transactions through the use of savepoints (for more that you use atomic(). Explicit Savepoints Just as you can explicitly create transactions, you can also explicitly create savepoints using the savepoint() method. Savepoints must occur within a transaction • Manages the underlying database connection. • Executes queries. • Manage transactions and savepoints. • Create and drop tables and indexes. • Introspect the database. commit_select = False Whether

and then can be used to: Open and close connections. Execute queries. Manage transactions (and savepoints). Introspect tables, columns, indexes, and constraints. Model integration Peewee comes with support using atomic(), the outer-most call will be wrapped in a transaction, and any nested calls will use savepoints. with db.atomic() as txn: perform_operation() with db.atomic() as nested_txn: perform_another_operation() Peewee supports nested transactions through the use of savepoints (for more information, see savepoint()). Explicit transaction If you wish to explicitly run code in a transaction

and then can be used to: Open and close connections. Execute queries. Manage transactions (and savepoints). Introspect tables, columns, indexes, and constraints. Model integration Peewee comes with support using atomic(), the outer-most call will be wrapped in a transaction, and any nested calls will use savepoints. with db.atomic() as txn: perform_operation() with db.atomic() as nested_txn: perform_another_operation() Peewee supports nested transactions through the use of savepoints (for more information, see savepoint()). Explicit transaction If you wish to explicitly run code in a transaction

and then can be used to: Open and close connections. Execute queries. Manage transactions (and savepoints). Introspect tables, columns, indexes, and constraints. Model integration Peewee comes with support using atomic(), the outer-most call will be wrapped in a transaction, and any nested calls will use savepoints. with db.atomic() as txn: perform_operation() with db.atomic() as nested_txn: perform_another_operation() Peewee supports nested transactions through the use of savepoints (for more information, see savepoint()). Explicit transaction If you wish to explicitly run code in a transaction

can be used to: • Open and close connections. • Execute queries. • Manage transactions (and savepoints). • Introspect tables, columns, indexes, and constraints. • Model integration Peewee comes with will use savepoints. with db.atomic() as txn: perform_operation() with db.atomic() as nested_txn: perform_another_operation() Peewee supports nested transactions through the use of savepoints (for more that you use atomic(). Explicit Savepoints Just as you can explicitly create transactions, you can also explicitly create savepoints using the savepoint() method. Savepoints must occur within a transaction

can be used to: • Open and close connections. • Execute queries. • Manage transactions (and savepoints). • Introspect tables, columns, indexes, and constraints. • Model integration Peewee comes with will use savepoints. with db.atomic() as txn: perform_operation() with db.atomic() as nested_txn: perform_another_operation() Peewee supports nested transactions through the use of savepoints (for more that you use atomic(). Explicit Savepoints Just as you can explicitly create transactions, you can also explicitly create savepoints using the savepoint() method. Savepoints must occur within a transaction

395 10.1.6. Internal Savepoints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 396 10.1.7. Savepoints and PSQL . . . . . . . rdb$set_context('USER_SESSION', 'RecordsFound', RecCounter); select rdb$set_context('USER_TRANSACTION', 'Savepoints', 'Yes') from rdb$database Notes • The maximum number of variables in any single context is variables set with RDB$SET_CONTEXT() remain unchanged. • Any savepoints that were created after the one named are destroyed. Savepoints earlier than the one named are preserved, along with the named

7 Restart strategies ??? Vasiliki Kalavri | Boston University 2020 Reconfiguration with Savepoints ??? Vasiliki Kalavri | Boston University 2020 • Change parallelism • scale out to process increased • Checkpoints are automatically created and removed by Flink. • Savepoints are never automatically removed. 14 savepoint Savepoints: user-triggered checkpoints ??? Vasiliki Kalavri | Boston University

and then can be used to: Open and close connections. Execute queries. Manage transactions (and savepoints). Introspect tables, columns, indexes, and constraints. Peewee comes with support for SQLite, using atomic(), the outer-most call will be wrapped in a transaction, and any nested calls will use savepoints. with db.atomic() as txn: perform_operation() with db.atomic() as nested_txn: perform_another_operation() Peewee supports nested transactions through the use of savepoints (for more information, see savepoint()). Explicit transaction If you wish to explicitly run code in a transaction