I'm trying to connect to a load-balanced virtual host specified in tnsnames.ora in my Grails application in DataSource.groovy, with no luck - it (obviously) throws an "Unknown Host Specified" exception.
The tnsnames entry looks like this
someServiceName =
(DESCRIPTION_LIST =
(FAILOVER=ON)
(LOAD_BALANCE=ON)
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = someServerName1)(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = someServiceName1)
)
)
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = someServerName2)(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = someServiceName2)
)
)
)
I can connect to one of the services (someServiceName1 & someServiceName2) by simply setting the values in DataSource.groovy in the usual way, but I don't know how to connect to the load-balanced virtual host.
I've searched around for using tnsnames.ora in Grails but I can't seem to find a particularly "groovy" way of making this work. Any pointers will be appreciated.
P.S. I would prefer a solution where I would still be able to inject the dataSource into my controllers etc.
I think you need to configure a single service with multiple addresses. Then you have to set your datasource URL string to something like this (without the newlines of course):
jdbc:oracle:thin#(DESCRIPTION=
(LOAD_BALANCE=on)
(ADDRESS=(PROTOCOL=TCP)(HOST=someServerName1) (PORT=1521))
(ADDRESS=(PROTOCOL=TCP)(HOST=someServerName2) (PORT=1521))
(CONNECT_DATA=(SERVICE_NAME=theOnlyServiceName)))
Look here and here for references.
You could use
jdbc:oracle:oci:#someServiceName
I use this, notice it's oci, not thin. It works for me.
Just ran into this issue, here's what fixed it for me:
url='jdbc:oracle:thin:#servername:PORT/servicename'
It was the forward slash between the port and the service name that tripped me up. If you use a colon there, it reads it as a SID instead of a service name.
Good luck!
Related
Dear stackoverflow community,
I know this question was already asked, but I tried to find a solution and unfortunately I'm blocked since 3 days now.
I installed Oracle 12c in Linux centos 7 server. When I try to access to the Oracle DB with SQL developer I have the following error:
Listener refused the connection with following error: ORA-12514, TNS:listener does not currently know of service requested in connect descriptor
What I do not understand is that if I restart the database I can connect. But Once I disconnect a try a reconnect I got the same error. Here is my listener.ora file
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = ns3008269.ip-151-80-45.eu)(PORT = 1521))
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
)
)
And my tnsnames.ora is :
rspdata =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = ns3008269.ip-151-80-45.eu)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = rspdata)
)
)
oraclepdb =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = ns3008269.ip-151-80-45.eu)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = oraclepdb)
)
)
And finally you can fin in attachment a screenshot of my Installation configuration.
I tried lot of and lot of thing... but still blocked.
Hello Stackoverflow community,
I was able to solve this issue. I re-installed Oracle 12c in Linux server and I used the tools netmgr and catmgr in order to configure the listener for the global DBname and also configure the services for PDB. This will automatically will modified the listener.ora and tnsnames.ora.
So my conclusion is that when installing Oracle12c do not modify by hand the listener.ora and tnsnames.ora.
Thank you all for your help and for the tips.
Please see screenshot:
I was successfully connected using SQL*Plus.
But when I trying to connect same database using same user using SQL Developer, then I'm getting error. Anyone have any idea ? I see all services running fine.
tnsnames.ora
ORCL =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = orcl)
)
)
Write
orcl in SID, not service name.
I think it will be good idea :)
I've installed Oracle 12c (desktop class) on my machine, and I can use it via sql developer on the same machine. Now how can I use the same database from another machine (for java application) in the LAN? I tried using the jdbc thin driver as follows: jdbc:oracle:thin:#10.0.11.69:1521:orcl where 10.0.11.69 is my ip address where Oracle is installed. Do i need to install any server where oracle is installed(10.0.11.69) to connect to my db from another machine?
I'm trying this from past 3 days and referred to many questions of the same model but none solved my issue.
My tnsnames.ora description is as follows:
LISTENER_ORCL =
(ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521))
ORACLR_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
)
(CONNECT_DATA =
(SID = CLRExtProc)
(PRESENTATION = RO)
)
)
ORCL =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = orcl)
)
)
Thanks in advance.
You need to connect to PDB if it is a Oracle 12c installation. You can add the following entry in tnsnames.ora:
pdborcl =
(DESCRIPTION =
(ADDRESS = (PROTOCOL=TCP)(HOST=localhost)(PORT=1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = pdborcl)
)
)
After setting this, the listener needs to be restarted.
lsnrctl stop
lsnrctl start
Then the connect string will be something like this:
jdbc:oracle:thin:#//10.0.11.69:1521/pdborcl
Note the connect string above uses service name instead of SID, because in 12C we need to use service name instead of SID to connect to PDB. Check this post for more details.
Java application will not use tnsnames.ora by it's own. You have to call:
System.setProperty("oracle.net.tns_admin", "..path to tnsnames.ora");
To tell the driver where to search for it.
Also note, that some tnsnames.ora constructs are not supported by thin driver. For examples the "include" directive.
Thanks for the following link, Configuring the connection between client and server Oracle 10g
after researching for a long time I found that I need to add my LAN address(10.0.11.69) in the listener.ora file which solves my problem.
so my listener.ora will looks like this now:
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS_LIST=
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = 10.0.11.69)(PORT = 1521))
)
)
)
How do I query two different Oracle database servers using a shell script?
How do I handle connecting to two different servers?
I have two different user ID and password.
I know this is not safe to include the id/pw in the shell script file but can you tell me how this is done?
server 1:
s1.mycompnay.com:1587/hr_dev.mycompany.com/HR_DB
server 1:
s2.mycompnay.com:1587/bank_dev.mycompany.com/BANK_DB
my shell script has something this:
sqlplus hr_db/$1 << EOF
You need to ensure that the path between the two servers is open and both servers have a registry in your tnsnames.ora file:
Using your description you would want two entries
HR_DB =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(Host = s1.mycompnay.com)(Port = 1587))
)
(CONNECT_DATA =
(SERVICE_NAME = HR_DB)
)
)
BANK_DB=
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(Host = s2.mycompnay.com)(Port = 1587))
)
(CONNECT_DATA =
(SERVICE_NAME = BANK_DB)
)
)
You already noted that it is bad practice to include the passwords in the script so I don't need to comment on that any further. After you get the entries in and have taken steps to ensure that firewalls are open you can test it by tnsping'ing the DBs:
tnsping HR_DB
tnsping BANK_DB
If those succeed it will tell you such as well as time in MS to return the packets. A failure will be immediately apparent.
I'm new here so I introduce myself, my name is Ettore Giallaurito and my job is in the IT services in Italy.
My question:
I'm trying to connect to an Oracle DB instance through an odbc (System DNS) connections under XP but I get an error ORA1254 TNS:could not resolvethe connect identifier specified.
I'm using oracle instant client 11.2 and I've my tnsnames properly configured, since I can get connected with DBVisualizer using the TNS method.
To be honest I do get connected in this case, but I need to insert the full connect string:
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = repsit01.sit.sor)(PORT = 1521))
(CONNECT_DATA = (SERVICE_NAME = REPSIT01))
)
since it doesn't get me in if I use just the SID, in my case REPSIT01 as showed below.
My tns entry is as follow:
REPSIT01 =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.1)(PORT = 1521))
(CONNECT_DATA = (SERVICE_NAME = REPSIT01))
)
Any help would be much apprecciated.
Thanks in advance Ettore.
Try setting the environment variable TNS_ADMIN to the directory where your tnsnames.ora file resides.