Because You dropped/deleted the table cache in Session A.
The simplest way to look at it is Session B was lock out when the Drop table command was issued from Session A. Now when session B finally got its chance to drop/delete the table it was already gone .
What kind error were you expecting from Postgresql to Return when it can't find the table???
In the future please don't cross post to multiple lists.
Step -7 now we can the see the error in the session B
ERROR: cache lookup failed for relation X
Could plese tell me, why this is generated and what is the cause.
Thanks in advance
Regards
Raghavendra
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