Hi,
I think I can find out the transaction ids of concurrent transactions
older than the current one by:
select * from txid_snapshot_xip(txid_current_snapshot())
union
select * from txid_snapshot_xmax(txid_current_snapshot());
Now, I want to map these transaction ids to backend process ids.
pg_stat_activity does not provide the transaction id. So, I turned to
pg_locks.
select l.pid
from (
select * from txid_snapshot_xip(txid_current_snapshot())
union
select * from txid_snapshot_xmax(txid_current_snapshot())) tx(id)
join pg_locks l
on ( l.locktype='transactionid'
and l.transactionid::TEXT::BIGINT=tx.id);
This works. But my transaction ids are still far less than 2^32.
Will it also work after the wraparound? I am worried because there is no
default cast from XID to INT or BIGINT.
Is there a better way?
Thanks,
Torsten
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