Author: Apps DBA

Connecting to a Database from SQLDeveloper fails with IO Error: The Network Adapter Could Not Establish The Connection

Issue: New Users were trying to access a 3-node RAC Oracle Database system using SQLDeveloper


Below is the connection string provided to user for Oracle Database Connection. RAC Virtual IP is provided to connect to Database.




TESTDB01=
       (DESCRIPTION=
               (ADDRESS=(PROTOCOL=tcp)(HOST=test001-vip1.domain.com)(PORT=1521))
               (ADDRESS=(PROTOCOL=tcp)(HOST=test002-vip1.domain.com)(PORT=1521))
               (ADDRESS=(PROTOCOL=tcp)(HOST=test003-vip1.domain.com)(PORT=1521))
           (CONNECT_DATA=
               (SERVICE_NAME=TESTDB01)
               (INSTANCE_NAME=TESTDB01)
           )
       )




User tried to connect using one of the VIP and got the below error in SQLDeveloper.
Status : Failure -Test failed: IO Error: The Network Adapter Could Not Establish The Connection.


Analysis:


Verified the Oracle Database Services and Listener Services are running fine.
Other Users were able to connect to SQLDeveloper using the same Connection String.


Solution:


User does not have network communication open to port 1521 on Oracle RAC Virtual IP.


ping  test001-vip1.domain.com
ping  test002-vip1.domain.com
ping  test003-vip1.domain.com


telnet test001-vip1.domain.com 1521
telnet test002-vip1.domain.com 1521
telnet test003-vip1.domain.com 1521


Ping to VIP address works fine but Telnet to port 1521 on the VIP address is giving “Connect Failed” Error.


When Network communication is opened on port 1521 on all the Oracle RAC Virtual IP servers/Addresses, User can connect to Oracle Database using SQLDeveloper.

Troubleshooting concurrent requests struck at Post processing Phase

Sometimes , Eventhough the Database sessions related to the concurrent Programs are in INACTIVE State , we could not terminate the Concurrent Request with error “Could not Lock Request” , Issue could be Requests are struck at Post Processing Phase and OutPut Post Processor is locking the Concurrent Requests.


Need to follow the below steps to perform clean shutdown of Oracle Concurrent Manager.


a) Put Pending Concurrent Requests on hold using the below sql queries.


+Create table apps.conc_req_on_hold as select * from fnd_Concurrent_requests where PHASE_CODE=’P’ and hold_flag=’N’;
+select count(*) from apps.conc_req_on_hold
+ update fnd_Concurrent_requests set hold_flag=’Y’ where PHASE_CODE=’P’ and hold_flag=’N’ and request_id in (select request_id from apps.conc_req_on_hold);


NOTE: You have to commit if select & update are same number of records. Otherwise rollback and try again till the numbers are same


+ Commit;


You can find more details about putting Pending Concurrent Jobs on Hold here.
http://www.appsdbadiaries.com/2016/01/concurrent-requests-on-hold.html








b)Bring Down Concurrent Manager using adcmctl.sh stop


c) Update the status of Struck Concurrent Requests to “Terminated” 


SQL> update fnd_concurrent_requests set status_code=’X’,phase_code=’C’ where status_code=’R’ and phase_code=’R’;


Commit;




Use Concurrent Manager Recovery Wizard from OAM to clear the database sessions associated with cancelled Requests.


d) Start Concurrent Manager using adcmctl.sh


e) Remove Hold on Concurrent Requests


SQL>update fnd_Concurrent_requests set hold_flag=’N’ where request_id in (select request_id from apps.conc_req_on_hold);


Commit the changes


 SQL>commit;

Steps to create Database link from Oracle Database to Microsoft SQLServer Database:

Steps to create Database link from Oracle Database to Microsoft SQLServer Database:


Pre-requisites


1. Check Network communication is Opened from Oracle Database Server to MSSQL Database Server using telnet
2. Download the Oracle Gateway Server Software same as your Oracle Database version.


Installation of Oracle Gateway Software
=========


Hope you have downloaded the Dg4msql software for sql server 


1> Create a directory as gateway under $ORACLE_BASE directory. 


2) Invoke the GUI , Select Oracle Gateway for MYSQL and enter the sql server details at the time of installation 


3) Before completing the installation, OUI invokes the NETCA and create a new listener for gateway with new port (ex:1526) 


Note; In case if you have defined any bash profile for TNS_ADMIN, then please comment it 


4. Follow the below note for pre-req for gateway listener 


How to Configure DG4MSQL (Oracle Database Gateway for MS SQL Server) 64bit Unix OS (Linux, Solaris, AIX,HP-UX) post install ( Doc ID 562509.1 ) 


edit your gateway listener as recommended in the above note. 


5. create a tnsentry in $ORACLE_HOME/network/admin 


6. export TNS_ADMIN=$gateway home/network/admin 


lsnrctl stop <gateway listener> 


lsnrctl start <gateway listener> 


tnsping <gateway alias> 


conn / as sysdba 


create public database link <test> connect to “<sql server user>” identified by “<password>” using ‘<tnsnames.ora>’ 


select * from dual@test; 

Script to check free space and used space in Oracle Database tablespaces

select a.tablespace_name,
       a.bytes_alloc/(1024*1024) “TOTAL ALLOC (MB)”,
 a.physical_bytes/(1024*1024) “TOTAL PHYS ALLOC (MB)”,
       nvl(b.tot_used,0)/(1024*1024) “USED (MB)”,
       (nvl(b.tot_used,0)/a.bytes_alloc)*100 “% USED”
from ( select tablespace_name,
       sum(bytes) physical_bytes,
sum(decode(autoextensible,’NO’,bytes,’YES’,maxbytes)) bytes_alloc
       from dba_data_files
       group by tablespace_name ) a,
     ( select tablespace_name, sum(bytes) tot_used
       from dba_segments
group by tablespace_name ) b
where a.tablespace_name = b.tablespace_name (+)
–and   (nvl(b.tot_used,0)/a.bytes_alloc)*100 > 10
and   a.tablespace_name not in (select distinct tablespace_name from dba_temp_files)
and   a.tablespace_name not like ‘UNDO%’
order by 1
 –order by 5
/ 

RMAN-03009: failure of allocate command on ORA_AUX_SBT_TAPE_1 channel



This is an error during Database Clone using RMAN. I was trying to restore database using RMAN Backup 


RMAN-00571: ===========================================================


RMAN-00569: ===============
ERROR MESSAGE STACK FOLLOWS ===============


RMAN-00571: ===========================================================


RMAN-03002: failure of Duplicate Db command
RMAN-05501: aborting duplication of target database


RMAN-03009: failure of allocate command on ORA_AUX_SBT_TAPE_1 channel 
ORA-19554: error allocating device, device type: SBT_TAPE, device name:


ORA-27211: Failed to load Media Management Library


Additional information: 


Cause: Backup Configuration was modified.


Solution:
Use the below command to Resolve the error and continue with Database Restore


rman auxiliary / 
run
{
allocate auxiliary channel c1 type disk;
allocate auxiliary channel c2 type disk;
duplicate database to ‘DEV’ backup location ‘/Daily_Backup/Backup_16042018’;
}
exit;
EOF

adcfgclone.pl script failed during instantiate OHS Stage

While cloning 12.2.6 environment, adcfgclone.pl script failed during instantiate OHS Stage.


Issue is because opmn components were unable to start up with below error messages.


globalInitNLS: NLS boot file not found or invalid
 — default linked-in boot block used
XML parser init: error 201.
globalInitNLS: NLS boot file not found or invalid
 — default linked-in boot block used


Further analysis on the clone logfiles for OHS creation shown that ORA_NLS10 parameter is unset before cloning.


Resolution:


$unset ORA_NLS10


+Restart the failed script

Concurrent Manager Troubleshooting : Multiple Concurrent Requests Struck without Processing


Scenario: Concurrent Requests are in Running Normal state for longer time than normal duration of the Program.

Analysis: 

Step 1: Navigate to System Administrator Responsibility : Concurrent Manager –> Administer

Identify the Concurrent Requests which are in Running Status.

Get the Database Session Details of the currently running concurrent requests using the below Query:

SELECT DISTINCT  a.request_id,C.INST_ID, d.sid, d.serial# ,d.osuser,d.process , c.SPID ,d.inst_id
FROM apps.fnd_concurrent_requests a,
apps.fnd_concurrent_processes b,
gv$process c,
gv$session d
WHERE a.controlling_manager = b.concurrent_process_id
AND c.pid = b.oracle_process_id
AND b.session_id=d.audsid
AND a.phase_code = ‘R’ and a.status_coDe=’R’;

Step 2: Verify if the database sessions are active/Inactive at the database level using the below query.

select inst_id,sid,serial#,program,module,status,last_call_et,sql_id from gv$session where sid=&sid;

— sid value to be taken from output of Sql Query in Step 1

If Database session is INACTIVE And Running no sql for more than an Hour, we can Terminate the Concurrent Requests.
If the Database session is ACTIVE and has an SQL_ID attached with it, Need to check on tuning the sql being run by the database session.

I will cover more details about SQL Tuning in another post.

How to add space in ACFS filesystem?

The below post explains the step-by-step process to add storage to a mountpoint in ACFS filesystem


1.Before extending the mountpoint storage we need to add an LVM of required Storage Capacity on the server.


For checking the LUN’s available on the server, click here


For now, assume the LUN added is /dev/sdf1


2. As root User, check the available disks by running the below command


$ /usr/sbin/oracleasm listdisks
DATA01
OCR_VOTE01
OCR_VOTE02
OCR_VOTE03


3. Create a new disk using the below command


/usr/sbin/oracleasm createdisk DATA02 /dev/sdf1 


Where DATA02 is the name of new disk added
/dev/sdf1 is the LUN added for storage extension.


4. Verify the disk is added by running the below command.


 $/etc/init.d/oracleasm  listdisks
DATA01
DATA02
OCR_VOTE01
OCR_VOTE02
OCR_VOTE03


5. Navigate to the other cluster nodes and run the scandisks command to reflect the newly added disk on all the nodes of cluster.


$/etc/init.d/oracleasm  scandisks
Scanning the system for Oracle ASMLib disks:               [  OK  ]


 $/etc/init.d/oracleasm  listdisks
DATA01
DATA02
OCR_VOTE01
OCR_VOTE02
OCR_VOTE03


6. Now login to the database server as GRID user (Where ASM instance is running) to add space to ACFS.


Set the environment as required




export ORACLE_HOME=/u01/app/12.1.0/grid
export PATH=$PATH:$ORACLE_HOME/bin
export ORACLE_SID=+ASM1


$sqlplus / as sysasm


SQL> alter diskgroup DATA add disk ‘/dev/oracleasm/disks/DATA02’;


Diskgroup altered.




7. Increase the space on filesystem


As root user,


$acfsutil size +1G /oradata
acfsutil size: new file system size: 591833071616 (564416MB)