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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