Doubt on single server multiple vs single-server instances several databases
Hello
Here is my banner for oracle:
Oracle banner:
Oracle Database 11 g Enterprise Edition Release 11.2.0.1.0 - 64 bit Production
PL/SQL Release 11.2.0.1.0 - Production
"CORE 11.2.0.1.0 Production."
AMT for 64-bit Windows: Version 11.2.0.1.0 - Production
NLSRTL Version 11.2.0.1.0 - Production
When you use the dbca command, it creates a new database. So is it possible to have multiple databases at the same time running on the same server?
I tried this option where I had created 2 databases A and B both running.
He kept to launch ' ORA-12520: TNS:listener could not find a Manager is available for the type of requested server "intermittently. I have not found any useful document to solve this because of which I ended up recreate all objects in database B to the database A. Data Base A therefore has its own schemas and schemas from database B.
Below are examples of files tnsnames.ora and listener.ora, sqlnet.ora trying this option:
sample tnsnames.ora file.
A =.
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = abc.com) (PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = A)
)
)
B =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = abc.com) (PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = B)
)
)
Listener.ora, example:
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = abc.com) (PORT = 1521))
(ADDRESS = (PROTOCOL = CIP)(KEY = EXTPROC1521))
)
)
ADR_BASE_LISTENER = C:\OracleDatabase
SQL Net.ora:
NAMES. DIRECTORY_PATH = (TNSNAMES, EZCONNECT)
ADR_BASE = C:\OracleDatabase
Lsnrctl status showed services for each database.
All the world is facing this problem? Can we have multiple databases on a server with a listener running on the same computer? So my Tnsnames.ora file would have 2 strings of connections and file listener with an entry of the listener.
Can you please share your tnsnames.ora and listener.ora files?
Also, how to create a single database with multiple instances on the same server? Please tell me about the document that contains an example of this.
Yes, you can have several databases (running different ORACLE_SIDs) the ORACLE_HOME even on a single server.
I suspect that the ORA-12520 error was the result of certain constraints of resources (cpu, memory or i/o) resulting in the inability to create a new database session.
Hemant K Collette
Tags: Database
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