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I need to bring some data (blobs) from another database. I created global links to enable bidirectional communication. The links work. When I try to bring some data from tables that have BLOB columns I get intermittently the ORA-12516:

TNS:listener could not find available handler with matching protocol stack

Here's what I run to bring BLOBs to my schema:

CREATE TABLE TEMP_MY_TABLE AS 
SELECT * FROM SOME_REMOTE_TABLE_WITH_BLOB_COLUMN@dblink_source;

Oracle 11 r2. Blobs have different sizes.

Number of PROCESSES is set to 1000 and only half is utilized during the run. Sessions = 1528.

Both source and target are identical in hardware and software including patches.

The links work fine for hundreds of other queries. I checked and they are resolved properly.

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  • Add the definition of the dblink. If it uses a TNS alias, post what that TNS alias is resolved to. Add the output of lsnrctl services from the source system. Add the output of select * from gv$resource_limit where resource_name in ('sessions', 'processes'); from the source database. Blob, dblink are most likely irrelevant here, sounds just like a typical connecion issue with inadequate free sessions/processes.
    – Balazs Papp
    Commented Jun 12, 2019 at 19:52

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Most probably you are reaching the maximum connections allowed. Make sure that old sessions are being closed properly and try increasing the processes and sessions parameters.

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