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https://stackoverflow.com/questions/25425944/does-postgres-support-nested-or-autonomous-transactions
Postgres does support nested transactions, but they differ from the conventional SQL, more like transactions with nested partial points. On the top level you always have your typical BEGIN/COMMIT/ROLLBACK, and on nested levels you have to use the following commands: SAVEPOINT name - creates a new savepoint, with name unique for the transaction
https://stackoverflow.com/a/25428060
Postgres does support nested transactions, but they differ from the conventional SQL, more like transactions with nested partial points. On the top level you always have your typical BEGIN/COMMIT/ROLLBACK , and on nested levels you have to use the following commands:
https://grokbase.com/t/postgresql/pgsql-general/09acwk38px/nested-transactions
There was a REALLY long discussion on the subject in the hackers list I believe that led to pgsql supporting savepoints but not nested transactions That's something entirely different and a …
https://www.postgresql.org/message-id/CAH1rg6YS5n6PjiV%3D9cBr2E--oKXtUuL%3DS7fNPs%2BY6BuwRA0iGA%40mail.gmail.com
I'd like to implement support for nested transactions in psycopg2 using a context manager that internally uses postgres savepoints to implement the ability to nest transactions within each other, with sensible commit and rollback semantics. The end goal is to allow code composability through support for nested transactions.
https://dba.stackexchange.com/questions/81011/transactions-within-a-transaction
Proper support for nested transactions means that the result of a successful sub-transaction isn't rolled back when its parent transaction is rolled back. But with PostgreSQL save-points, if you roll-back the top-level transaction, the result of all inner save-points is also rolled back.
https://www.postgresql.org/docs/9.1/transaction-iso.html
The Repeatable Read isolation level only sees data committed before the transaction began; it never sees either uncommitted data or changes committed during transaction execution by concurrent transactions. (However, the query does see the effects of previous updates executed within its own transaction, even though they are not yet committed.)
https://www.postgresql.org/files/developer/transactions.pdf
• Postgres does not support distributed transactions, so all commands of a transaction are executed by one backend. • We don’t currently handle nested transactions, either. 5 30 Oct 2000 Tom Lane
https://forum.hibernate.org/viewtopic.php?t=929449
Aug 11, 2009 · While Hibernate does not explicitly support nested transactions, using a JDBC 3.0 driver that is able to create savepoints can achieve this. Create a Connection at the start of the program when the SessionFactory is created. At this point you also create a Savepoint that serves as the starting point for the transaction.
https://www.postgresql.org/docs/8.3/tutorial-transactions.html
PostgreSQL actually treats every SQL statement as being executed within a transaction. If you do not issue a BEGIN command, then each individual statement has an implicit BEGIN and (if successful) COMMIT wrapped around it. A group of statements surrounded by BEGIN and COMMIT is sometimes called a transaction block.
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