Instance status BLOCKED

Question

system: ORACLE RAC 9i on Solaris 9. have 2 databases (4 instances).
problem: can connect 3 instances but unable to connect 4th. following error.
ORA-12521: TNS:listener could not resolve INSTANCE_NAME given in connect descriptor.
when I check listener status its shows following.
Service "BODB.world" has 2 instance(s).
Instance "BODB1", status READY, has 2 handler(s) for this service...
Instance "BODB2", status READY, has 1 handler(s) for this service...
Service "DB.world" has 2 instance(s).
Instance "DB1", status READY, has 2 handler(s) for this service...
Instance "DB2", status BLOCKED, has 1 handler(s) for this service...
how can I change instance status BLOCKED to READY?

Answer 1

Hi,
it very nice your solve your problem but one of possible reason when database configure in SHARED SERVER mode. or we received ORA-12520 error.
Oracle Version : 10.1.0.2.0
OS : Windows XP sp2
Database configure in Shared Server Mode.
SQL> show parameter dispatchers
NAME TYPE VALUE
dispatchers
string
(PROTOCOL=TCP)
max_dispatchers integer
SQL> show parameter shared_servers
NAME TYPE VALUE
max_shared_servers integer
shared_servers integer 1
---------------------------------------------------------after change shared server = 0 then i got error "ora-12520".
SQL> alter system set shared_servers = 0;
System altered.
SQL> conn scott/tiger@sh
ERROR:ORA-12520: TNS:listener could not find available handler for requested type ofserver
C:\>lsnrctl services
Service "sh" has 1 instance(s).
Instance "sh", status READY, has 2 handler(s) for this service...
Handler(s):
"DEDICATED" established:0 refused:0 state:ready
LOCAL SERVER
"D000" established:3 refused:0 current:2 max:1002 state:blocked
DISPATCHER
(ADDRESS=(PROTOCOL=tcp)(HOST=alwarid-taj.fakhruddin.local)(PORT=3348))
For above error you have to check configure two parameters.
1.Shared_servers
2.Dispatchers
SQL> alter system set shared_servers = 1;
System altered.
SQL> alter system set dispatchers = "(PROTOCOL=TCP)" ;
System altered.
Service "sh" has 1 instance(s).
Instance "sh", status READY, has 2 handler(s) for this service...
Handler(s):
"DEDICATED" established:0 refused:0 state:ready
LOCAL SERVER
"D000" established:4 refused:0 current:2 max:1002 state:ready
DISPATCHER
(ADDRESS=(PROTOCOL=tcp)(HOST=alwarid-taj.fakhruddin.local)(PORT=3348))
The command completed successfullyregards
Taj
Message was edited by:
M. Taj