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Tuesday, June 20, 2017

ORA-12528: TNS:listener: all appropriate instances are blocking new connections

ORA-12528: TNS:listener: all appropriate instances are blocking new connections

LSNRCTL> status APPLE7
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=ggdomain)(PORT=1522)))
STATUS of the LISTENER
------------------------
Alias                     APPLE7
Version                   TNSLSNR for Linux: Version 11.2.0.3.0 - Production
Start Date                20-JUN-2017 06:07:39
Uptime                    0 days 0 hr. 37 min. 7 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   /u01/app/oracle/product/11.2.0/dbhome_1/network/admin/listener.ora
Listener Log File         /u01/app/oracle/diag/tnslsnr/ggdomain/apple7/alert/log.xml
Listening Endpoints Summary...
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=ggdomain)(PORT=1522)))
  (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1522)))
Services Summary...
Service "APPLE7" has 1 instance(s).
  Instance "APPLE7DR", status UNKNOWN, has 1 handler(s) for this service...
Service "APPLE7DR" has 2 instance(s).
  Instance "APPLE7DR", status BLOCKED, has 1 handler(s) for this service...
  Instance "apple7dr", status BLOCKED, has 1 handler(s) for this service...
The command completed successfully

How to overcome this?
Add  (UR = A) in the TNSnames.ora
The (UR=A) clause for TNS connect strings has been created as an enhancement request.

TNSnames.ora

APPLE7DR =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.150)(PORT = 1522))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = apple7dr)
 (UR = A)
  )
  )

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