On 9/18/24 1:40 PM, veem v wrote:
You were spot on. When we turned off the "auto commit" we started
seeing less number of commits as per the number of batches.
However we also started seeing deadlock issues. We have foreign key
relationships between the tables and during the batch we do insert
into the parent first and then to the child , but this does happen
from multiple sessions for different batches. So why do we see below
error, as we ensure in each batch we first insert into parent and
then into the child tables?
caused by: org.postgresql.util.PSQLException: ERROR: deadlock detected
Detail: Process 10443 waits for ShareLock on transaction
220972157; blocked by process 10454.
Process 10454 waits for ShareLock on transaction 220972155; blocked
by process 10443.
Hint: See server log for query details.
Where: while inserting index tuple (88736,28) in relation
"TAB1_p2024_08_29"
As we are able to get hold of one session, we see "insert into <parent
partition table>" was blocked by "insert into <child partition table>".
And the "insert into <child partition table> " was experiencing a
"client read" wait event. Still unable to understand why it's happening
and how to fix it?
This needs clarification.
1) To be clear when you refer to parent and child that is:
FK
parent_tbl.fld <--> child_tbl.fld_fk
not parent and child tables in partitioning scheme?
2) What are the table schemas?
3) What is the code that is generating the error?
Overall it looks like this process needs a top to bottom audit to map
out what is actually being done versus what needs to be done.
--
Adrian Klaver
adrian.klaver@xxxxxxxxxxx
