The sqlplus slow login is because sqlplus trying to connect to db server ONS/6200,
sqldeveloper does not have this issue because sqldeveloper will not auto configure FAN.
a. open port 6200
b. In the db side, use srvctl to configure all _srv db services NOT to enable notification
e.g.
srvctl modify service -d <dbname> -s <service name> -notification FALSE
c. Add a config file ons_oraaccess.xml to disable notification
12c Client: Approximate 9 - 10 Second Delay in Connecting via Remote SQL*Plus (Doc ID 2218140.1)
Symptoms
An Oracle 12c client (SQL*Plus) takes approximately 10 seconds to connect to 12c database.
A review of the client traces shows the connection seemed to hang during the authentication phase.
It also revealed the client was reaching out to the ONS on port 6200:
(2724587008) 22-DEC-2016 17:58:03:577 nsbasic_brc: 0F 00 00 00 0F 41 55 54 |.....AUT|
(2724587008) 22-DEC-2016 17:58:03:577 nsbasic_brc: 48 5F 4F 4E 53 5F 43 4F |H_ONS_CO|
(2724587008) 22-DEC-2016 17:58:03:577 nsbasic_brc: 4E 46 49 47 47 00 00 00 |NFIGG...|
(2724587008) 22-DEC-2016 17:58:03:577 nsbasic_brc: 47 6D 61 78 63 6F 6E 6E |Gmaxconn|
(2724587008) 22-DEC-2016 17:58:03:577 nsbasic_brc: 65 63 74 69 6F 6E 73 2E |ections.|
(2724587008) 22-DEC-2016 17:58:03:577 nsbasic_brc: 30 30 30 31 3D 30 30 30 |0001=000|
(2724587008) 22-DEC-2016 17:58:03:577 nsbasic_brc: 33 0A 6E 6F 64 65 73 2E |3.nodes.|
(2724587008) 22-DEC-2016 17:58:03:577 nsbasic_brc: 30 30 30 31 3D 73 73 30 |0001=any|
(2724587008) 22-DEC-2016 17:58:03:577 nsbasic_brc: 30 37 31 31 31 2E 69 6E |host.here|
(2724587008) 22-DEC-2016 17:58:03:577 nsbasic_brc: 74 72 61 30 31 2E 73 61 |.domain.|
(2724587008) 22-DEC-2016 17:58:03:577 nsbasic_brc: 6E 69 74 61 73 2E 63 6F |world.co|
(2724587008) 22-DEC-2016 17:58:03:577 nsbasic_brc: 6D 3A 36 32 30 30 0A 00 |m:6200..|
10 seconds pass when the client abandons the connection to the ONS because:
A) it is not running or
B) it is not reachable through a firewall.
Connection does get established to the database around 10 seconds later:
Note that at 17:58:13 the banner is delivered to the client indicating the connection to the database
is successful:
(2724587008) 22-DEC-2016 17:58:13:005 nsprecv: 00 00 00 BE 06 00 00 00 |........|
(2724587008) 22-DEC-2016 17:58:13:005 nsprecv: 00 00 08 A5 00 A5 4F 72 |......Or|
(2724587008) 22-DEC-2016 17:58:13:005 nsprecv: 61 63 6C 65 20 44 61 74 |acle.Dat|
(2724587008) 22-DEC-2016 17:58:13:005 nsprecv: 61 62 61 73 65 20 31 32 |abase.12|
(2724587008) 22-DEC-2016 17:58:13:005 nsprecv: 63 20 45 6E 74 65 72 70 |c.Enterp|
(2724587008) 22-DEC-2016 17:58:13:005 nsprecv: 72 69 73 65 20 45 64 69 |rise.Edi|
(2724587008) 22-DEC-2016 17:58:13:005 nsprecv: 74 69 6F 6E 20 52 65 6C |tion.Rel|
(2724587008) 22-DEC-2016 17:58:13:005 nsprecv: 65 61 73 65 20 31 32 2E |ease.12.|
(2724587008) 22-DEC-2016 17:58:13:005 nsprecv: 31 2E 30 2E 32 2E 30 20 |1.0.2.0.|
(2724587008) 22-DEC-2016 17:58:13:005 nsprecv: 2D 20 36 34 62 69 74 20 |-.64bit.|
Changes
This is likely a new installation or an upgrade to the 12c client.
Cause
FAN or Fast Application Notification events are enabled by default in the 12c client.
The client will attempt to contact an Oracle Notification Server during the remote
connection process. The default port for the ONS is 6200.
See the following document:
Scroll to this section:
Database client 12c, FAN is auto-configured. This means that when the client starts, it queries the databases for the ONS
end-points automatically. The automatic configuration spans data centers. The client automatically receives an ONS
configuration from each database listed in the connection URL. No configuration of ONS is required at the client other
than enabling FAN.
The Oracle Notification Service on the database server was not running or not available.
Once the ONS was started, the TCP connections on the server itself are working normally.
The delay is corrected.
However, if a remote SQL*Plus connection continues (after confirming the ONS is up) to encounter a delay
of about 10 seconds, it may be necessary to open port 6200 on the firewall in order to allow the communication
from client to the ONS.
The problem is a 10 sec wait trying to get ONS on port 6200.
The firewall doesn't allow communication through port 6200.
Solution
-
Configure the firewall to allow access from the client to the ONS on port 6200.
-
Disable ONS event notifications as they are ON by default in 12c SQL*Plus client.
Oracle does not consider disabling events a "best practice" solution.
- Turn off notifications at the server using srvctl:
The service to which you're connecting can be modified with -notification =FALSE
srvctl modify service -d <dbname> -s <service name> -notification FALSE
See the srvctl documentation for assistance.
You can disable the ONS contact at the client using these instructions:
- Copy the ons_oraaccess.xml file from the database server at
$ORACLE_HOME/rdbms/demo
- Save the file to: ORACLE_HOME/network/admin or TNS_ADMIN
Rename the file to oraaccess.xml
The ons_oraaccess.xml file in its default state looks like this (header removed)
<oraaccess xmlns="http://xmlns.oracle.com/oci/oraaccess"
xmlns:oci="http://xmlns.oracle.com/oci/oraaccess"
schemaLocation="http://xmlns.oracle.com/oci/oraaccess
http://xmlns.oracle.com/oci/oraaccess.xsd">
<default_parameters>
<events>false</events>
</default_parameters>
</oraaccess>
- Make the following change to the file:
Go to the <default_parameters> section in the oraaccess.xml file. You might see that you have more than 1 <default_parameters> section but there
is only 1 setting like: <events>true<events>
<default_parameters> - This element describes any default parameter settings shared across connections. These default parameters include:
Change only this:
FROM:
<events>true<events>
TO:
<events>false<events>
3) Check the connection again and confirm that there is no delay. If the delay persists after this change,
this document may not apply to your situation and you should remove the oraaccess.xml file from the client.So to be clear, obtain your oraaccess.xml from $ORACLE_HOME/rdbms/demo on the
server.
Copy it to your remote client's ORACLE_HOME/network/admin or TNS_ADMIN
directory.
Try the connection again after changing events from true to false:
FROM:
<events>true <events>
TO:
<events>false <events>
Once you confirm that the communication to the ONS or Oracle Notification Service is the problem, take
the necessary action.
It is an acceptable workaround to de-subscribe to the ONS using the method described here. However,
enabling events is a valuable enhancement to the Oracle client.