On Thu, Oct 28, 2021 at 12:02:30PM -0400, Chapman Flack wrote: > On 10/28/21 10:37, Bruce Momjian wrote: > > > I know of no plans to implement 64-bit transaction ids in community > > Postgres because of the longer tuple header and file format changes. > > It is discussed occasionally though. > > Is there anything you can use a SubTransactionId for outside of C code? > > PL/Java interacts with these things through BeginInternalSubTransaction(), > ReleaseCurrentSubTransaction(), or RollbackAndReleaseCurrentSubTransaction() > in C. > > It also has been obeying the letter of the JDBC spec by implementing > a method that can return it to the caller (as a Java 32-bit int, oops, > so decreed by the spec). [0] > > But as I think about it, I am not sure there is anything interesting or > useful a Java caller could do with a SubTransactionId anyway. I mean, does > it even appear in a statistics view or SQL-exposed function anywhere? I see > there is a top-level backend_xid in pg_stat_activity, but is there any > exposure of SubTransactionIds anywhere? > > Everything you can do with a Savepoint in JDBC (release it or roll it back, > what else is there?) is just a method on the Java object and you don't need > to know its underlying id.
That is my assumption too. -- Bruce Momjian <br...@momjian.us> https://momjian.us EDB https://enterprisedb.com If only the physical world exists, free will is an illusion.
