ORA-12505: Database Instance and Agent Connection to Instance will not work

Question

Hi,
I have the following error: in Oracle 10g I try to connect to OEM and the listener is up but the Database Instance and Agent Connection to Instance are down. When I attempt to restart the instance, OEM will just hang indefinitely. I have used tnsping and the results are OK. Is that descriptive enough? What can I do to fix this?
regards,
John

Answer 1

I changed the SID because I was mistaken and thought of the oracle database name. I have corrected the ORACLE_SID to that given in my tnsnames.ora file which I post here:
ORACLE =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = Lasirius-laptop)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = oracle)
EXTPROC_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
(CONNECT_DATA =
(SID = PLSExtProc)
(PRESENTATION = RO)
These are the default settings that were made on installation. I have been working with this installation for 2 months, and it just suddenly stopped working. I have changed no other settings apart from the mistaken ORACLE_SID environment variable in this post, which has now been changed to PLSExtProc. Here is my init.ora:
# replace "clustdb" with your database name
db_name = clustdb
compatible=9.0.0
db_files = 1024 # INITIAL
#INITIAL
#db_files=80
#SMALL
#DB_files=400
#MEDIUM
#db_files=1000
#LARGE
control_files = ("\\.\clustdb_control1", "\\.\clustdb_control2")
db_file_multiblock_read_count = 8 # INITIAL
# db_file_multiblock_read_count = 8
#SMALL
#db_file_multiblock_read_count = 16
#MEDIUM
#db_file_multiblock_read_count = 32
#LARGE
#Datawarehouse
db_block_size=8192
# Transaction processing
# db_block_size=4096
open_cursors=300
#Transaction processing
#sort_area_size=524288
#Datawarehouse
sort_area_size=1048576
large_pool_size=1048576 #Transaction processing, Datawarehouse
db_cache_size=50331648 #Datawarehouse, Transaction processing
java_pool_size=67108864 #Datawarehouse, Transaction processing
# db_block_buffers = 200 # INITIAL
# db_block_buffers=100 #SMALL
# db_block_buffers =550 # MEDIUM
# db_block_buffers=3200 #LARGE
#shared_pool_size = 52428800 # INITIAL
shared_pool_size = 67108864 # datewarehouse, transaction processing
log_checkpoint_interval = 10000
processes = 59 # INITIAL
# processes = 50
#SMALL
#processes = 100
#MEDIUM
#processes = 200
#LARGE
parallel_max_servers = 5
#SMALL
# parallel_max_servers = 4 x (number of CPUs)
#MEDIUM
# parallel_max_servers = 4 x (number of CPUs)
# LARGE
log_buffer = 8192 # INITIAL
#log_buffer = 8192
#SMALL
#log_buffer = 32768
#MEDIUM
#log_buffer = 163840
#LARGE
# audit_trail = true # if you want auditing
# timed_statistics = true # if you want timed statistics
max_dump_file_size = 10240 # limit trace file size to 10 K each
# Uncommenting the line below will cause automatic archiving if archiving has
# been enabled using ALTER DATABASE ARCHIVELOG.
# log_archive_start = true
# log_archive_dest = %ORACLE_HOME%/admin/clustdb/arch
# log_archive_format = "%%ORACLE_SID%%T%TS%S.ARC"
# If using private rollback segments, place lines of the following
# form at the end of this file:
# <sid>.rollback_segments = (name1, name2)
# If using public rollback segments, define how many
# rollback segments each instance will pick up, using the formula
# # of rollback segments = transactions / transactions_per_rollback_segment
# In this example each instance will grab 40/10 = 4:
# transactions = 40
# transactions_per_rollback_segment = 10
# Global Naming -- enforce that a dblink has same name as the db it connects to
global_names = TRUE
# Edit and uncomment the following line to provide the suffix that will be
# appended to the db_name parameter (separated with a dot) and stored as the
# global database name when a database is created. If your site uses
# Internet Domain names for e-mail, then the part of your e-mail address after
# the '@' is a good candidate for this parameter value.
# db_domain = us.acme.com # global database name is db_name.db_domain
# Uncomment the following line if you wish to enable the Oracle Trace product
# to trace server activity. This enables scheduling of server collections
# from the Oracle Enterprise Manager Console.
# Also, if the oracle_trace_collection_name parameter is non-null,
# every session will write to the named collection, as well as enabling you
# to schedule future collections from the console.
# oracle_trace_enable = TRUE
# define directories to store trace and alert files
background_dump_dest=%ORACLE_HOME%/admin/clustdb/bdump
user_dump_dest=%ORACLE_HOME%/admin/clustdb/
db_block_size = 4096
remote_login_passwordfile = exclusive
# text_enable = TRUE
# The following parameters are needed for the Advanced Replication Option
job_queue_processes = 2
# job_queue_processes = 4 #datawarehouse
# job_queue_interval = 10
# job_queue_keep_connections = false
distributed_transactions = 5
open_links = 4
# The following parameters are instance-specific parameters that are
# specified for two instances named clustdb1 and clustdb2
undo_management=AUTO # For automatic undo management
# = MANUAL For manual/RBS undo management
cluster_database= true
cluster_database_instances=2
remote_listener=LISTENERS_CLUSTDB
# First instance specific parameters
clustdb1.thread=1
clustdb1.instance_name=clustdb1
clustdb1.instance_number=1
clustdb1.local_listener=listener_clustdb1
clustdb1.remote_login_passwordfile = exclusive
# Comment out clustdb1.undo_tablespace and uncomment clustdb1.rollback_segments
# when undo_management=MANUAL
clustdb1.undo_tablespace = UNDOTBS1
# clustdb1.rollback_segments = (rbs1_1,rbs1_2)
# Second instance specific parameters
clustdb2.thread=2
clustdb2.instance_name = clustdb2
clustdb2.instance_number = 2
clustdb2.local_listener = listener_clustdb2
clustdb2.remote_login_passwordfile = exclusive
# Comment out clustdb2.undo_tablespace and uncomment clustdb2.rollback_segments
# when undo_management=MANUAL
clustdb2.undo_tablespace = UNDOTBS2
# clustdb2.rollback_segments = (rbs2_1,rbs2_2)