Are these blocking queries just executing or parsing? See the various IN% flags
in ASH output.
Sent from my iPhone
On 11 Sep 2023, at 19:22, Ls Cheng <exriscer@xxxxxxxxx> wrote:
Forgot to mention that the queries are all parallel queries
On Mon, Sep 11, 2023 at 8:13 PM Ls Cheng
<exriscer@xxxxxxxxx<mailto:exriscer@xxxxxxxxx>> wrote:
Hi
Running 19.15.
I have some batch processes which run exchange partition commands then run some
ETL, sometimes the exchange partition takes minutes instead of seconds and the
ALTER is waiting for the library cache lock. From ASH we can see that the
blocking sessions are running queries against the partition. I tried to
reproduce the issue but in my tests the exchange partition runs successfully
and there is no library cache lock while the table is being queried.
So I wonder what is exactly causing library cache lock to the ALTER TABLE
exchange partition?
Thanks
