Need a domain name?

Hello

in recent weeks, trying to set up a database of the 12 Oracle and Oracle Enterprise Manager on a Microsoft Windows Server 2008 R2 virtual computer. The last time I had some problems connecting to the PDB, so I deleted the CBD and started around. Then, I couldn't even connect to the CBD.

I chose an easy global name: 'WS2014' without any domain name. Everything I tried, I could not connect. So I suspect that the domain name is necessary, isn't it?

Now, I created a false domain name in my hosts file:

192.168.73.2local.com
192.168.73.128ORCL.local.comORCL

The new global name now is orcl.local.com, the name of the service of the CDB is also orcl.local.com (the installer set on its own to this value) and the PDB is pdborcl.local.com.

After the opening of the PDB (alter connectable to all database open; why I have to explicitly open them?) I can connect to the CBD and the PDB as well.

So my questions as stated above:

  1. is the domain name needed, although it is only a fake that I put in the hosts file?
  2. What could be the problem on my last setup when I chose WS2014 as the name of name service / overall?
  3. Why should I run alter database connectable to all open; explicitly?

Thanks in advance!

in recent weeks, trying to set up a database of the 12 Oracle and Oracle Enterprise Manager on a Microsoft Windows Server 2008 R2 virtual computer. The last time I had some problems connecting to the PDB

Well - we cannot help you at the level of the "problems you might have had since you do not" post.

The most common problem with 12 c is that people didn't RTFM before you begin to install and you try to use the database.

If you have not already done, so you must read and understand the chapters 17 and 18 of the doc of Concepts on the new multitenancy of the 12 c.

http://docs.Oracle.com/CD/E16655_01/server.121/e17633/part_consol.htm#CHDGDBHJ

These chapters introduce the new architecture and BEGIN (and I emphasize the word 'start') the process of clarification on the differences again. They talk about some of the differences between users the and common.

The next most common 'number' is trying to connect to a PDB file that has not been opened. The START command does NOT open the PDB files. If you want to pdb open for you is obliged to open them manually after the boot or create a trigger AFTER STARTUP that runs the alter and opens to them.

Third place 'question' trying to connect ot a PDB file that does not have the appropriate entry in the TNSNAMES file. ORA or try to use the SID instead of SERVICE_NAME. The 12 c DB REQUIRES service_name, not MSN.

The fourth most common 'question' is trying to create a local user in the CBD. Local users cannot be created in the CBD - only in the PDB files. But then the people who have not read these chapters two doc don't know the difference between a common user and a local user so they get exceptions, they do not understand. Save yourself a LOT of trouble and read these two chapters.

I chose an easy global name: 'WS2014' without any domain name. Everything I tried, I could not connect. So I suspect that the domain name is necessary, isn't it?

No - it is NOT necessary in 12 c and hasn't ' st was necessary in any previous version. It is also in the documentation.

See "determine the global database name"

https://docs.Oracle.com/database/121/Admin/create.htm#i1013998

The global database name includes the name specified by the local database user and location of the database in a network structure. The DB_NAME initialization parameter determines the local name of the name of database component and the DB_DOMAIN optional parameter indicates the domain (logical location) within a network structure. The combination of settings for these two parameters must form a unique database name within a network.

DB_DOMAIN initialization parameter

DB_DOMAINis a text string that specifies the network domain where the database is created. If the database you are about to create will never be part of a distributed database system, and then pay special attention to this initialization parameter before the creation of the database. This parameter is optional.

If you use the DB_DOMAIN parameter, then the overall DB name includes the value that you specify.

After the opening of the PDB (alter connectable to all database open; why I have to explicitly open them?) I can connect to the CBD and the PDB as well.

PDB does NOT open by default. You need to manually open them, or you create a trigger AFTER the opening of SESSION that issues an ALTER statement to open the PDB files that you want to open.

If Oracle has just opened all the PDBs default (or rather "tried" to open) you don't have control over those who had opened. Oracle would even try to open those that you have intentionally shutdown. What sense would it make?

A PDB file is a database. Like all databases - you want it opened, and then open.

  1. is the domain name needed, although it is only a fake that I put in the hosts file?
  2. What could be the problem on my last setup when I chose WS2014 as the name of name service / overall?
  3. Why should I run alter database connectable to all open; explicitly?

#1-No - see above reference doc

#2-who knows - we cannot help you if you do not post the problem and the necessary info

#3-already answered - if you want to open a database, ALL database, you must open. It's no different for 12 c for earlier versions of DB.

I STRONGLY suggest that you take a break and RTFM - in particular chapters 17 and 18 of the concepts doc.

If you do not you will display the questions again about 'where are default patterns', "why can I not connect to the PDB" or "why can I not create a user named User1.

Tags: Database

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