Query on "bigtable" from remote Client hangs (certain queries or fields) (Doc ID 2104257.1)

Last updated on MARCH 03, 2022

Applies to:

Symptoms

Certain queries are hanging when run from some remote Clients.
However, other (smaller) queries are successful.

This is especially evident on queries that require more than 2kb of data to be returned.
Some examples:

select * from v$database; --> hangs
select count(*) from v$database; --> works

DESCRIBE with large data results --> hangs
DESCRIBE with small data results --> works

This might also show up with Database Links (DBLINK) as well.

Trace data
~~~~~~~~~
Matching Client and Server (level 16) tracing on each side shows the following at the time of the "hang"

Client -->

--> Server waits on the Client for "MOREDATA" (but the Client is waiting on the information requested by the last query).
Hence the hanging.

Cause

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