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How to enable RAT feature and some Troubleshooting

Posted by FatDBA on February 28, 2020

Hi Everyone,

This post of all about preparing your database before you start using RAT on it, as it’s little tricky. You have to enable the feature at the binary level before you start using the RAT replay plus you have to patch your database with few of the RAT related mandatory patches.

This post is all about enabling the feature at the binary level and one of the issue that I have faced immediately after that.

My database which is 11.2.0.4.0 (2 Node RAC) has the RAT feature set to FALSE, which means that the option is not yet enabled.


SQL> select * from v$option where parameter like 'Real Application Testing';

PARAMETER                                                        VALUE
---------------------------------------------------------------- ----------------------------------------------------------------
Real Application Testing                                         FALSE
 

Alright, so next step is to enable the feature at the binary level, and to do that you have to run ‘make’ command and bind rat_on to your Oracle Home. Here I have a 2 Node RAC and I am starting with Node 1 and once done will repeat steps on Node 2.


[oracle@Testdb lib]$ make -f ins_rdbms.mk rat_on ioracle
/usr/bin/ar d /u01/app/oracle/product/11.2.0/dbhome_1/rdbms/lib/libknlopt.a kecnr.o
/usr/bin/ar cr /u01/app/oracle/product/11.2.0/dbhome_1/rdbms/lib/libknlopt.a /u01/app/oracle/product/11.2.0/dbhome_1/rdbms/lib/kecwr.o
chmod 755 /u01/app/oracle/product/11.2.0/dbhome_1/bin

 - Linking Oracle
rm -f /u01/app/oracle/product/11.2.0/dbhome_1/rdbms/lib/oracle
gcc  -o /u01/app/oracle/product/11.2.0/dbhome_1/rdbms/lib/oracle -m64 -z noexecstack -L/u01/app/oracle/product/11.2.0/dbhome_1/rdbms/lib/ -L/u01/app/oracle/product/11.2.0/dbhome_1/lib/ 
-L/u01/app/oracle/product/11.2.0/dbhome_1/lib/stubs/   -Wl,-E /u01/app/oracle/product/11.2.0/dbhome_1/rdbms/lib/opimai.o /u01/app/oracle/product/11.2.0/dbhome_1/rdbms/lib/ssoraed.o /u01/app/oracle/product/11.2.0/dbhome_1/rdbms/lib/ttcsoi.o  -Wl,--whole-archive -lperfsrv11 -Wl,--no-whole-archive /u01/app/oracle/product/11.2.0/dbhome_1/lib/nautab.o /u01/app/oracle/product/11.2.0/dbhome_1/lib/naeet.o /u01/app/oracle/product/11.2.0/dbhome_1/lib/naect.o /u01/app/oracle/product/11.2.0/dbhome_1/lib/naedhs.o /u01/app/oracle/product/11.2.0/dbhome_1/rdbms/lib/config.o  -lserver11 -lodm11 -lcell11 -lnnet11 -lskgxp11 -lsnls11 -lnls11  -lcore11 -lsnls11 -lnls11 -lcore11 -lsnls11 -lnls11 -lxml11 -lcore11 -lunls11 -lsnls11 -lnls11 -lcore11 -lnls11 -lclient11  -lvsn11 -lcommon11 -lgeneric11 -lknlopt `if /usr/bin/ar tv /u01/app/oracle/product/11.2.0/dbhome_1/rdbms/lib/libknlopt.a | grep xsyeolap.o > /dev/null 2>&1 ; then echo "-loraolap11" ; fi` -lslax11 -lpls11  -lrt -lplp11 -lserver11 -lclient11  -lvsn11 -lcommon11 -lgeneric11 `if [ -f /u01/app/oracle/product/11.2.0/dbhome_1/lib/libavserver11.a ] ; then echo "-lavserver11" ; else echo "-lavstub11"; fi` `if [ -f /u01/app/oracle/product/11.2.0/dbhome_1/lib/libavclient11.a ] ; then echo "-lavclient11" ; fi` -lknlopt -lslax11 -lpls11  -lrt -lplp11 -ljavavm11 -lserver11  -lwwg  `cat /u01/app/oracle/product/11.2.0/dbhome_1/lib/ldflags`    -lncrypt11 -lnsgr11 -lnzjs11 -ln11 -lnl11 -lnro11 `cat /u01/app/oracle/product/11.2.0/dbhome_1/lib/ldflags`    -lncrypt11 -lnsgr11 -lnzjs11 -ln11 -lnl11 -lnnz11 -lzt11 -lmm -lsnls11 -lnls11  -lcore11 -lsnls11 -lnls11 -lcore11 -lsnls11 -lnls11 -lxml11 -lcore11 -lunls11 -lsnls11 -lnls11 -lcore11 -lnls11 -lztkg11 `cat /u01/app/oracle/product/11.2.0/dbhome_1/lib/ldflags`    -lncrypt11 -lnsgr11 -lnzjs11 -ln11 -lnl11 -lnro11 `cat /u01/app/oracle/product/11.2.0/dbhome_1/lib/ldflags`    -lncrypt11 -lnsgr11 -lnzjs11 -ln11 -lnl11 -lnnz11 -lzt11   -lsnls11 -lnls11  -lcore11 -lsnls11 -lnls11 -lcore11 -lsnls11 -lnls11 -lxml11 -lcore11 -lunls11 -lsnls11 -lnls11 -lcore11 -lnls11 `if /usr/bin/ar tv /u01/app/oracle/product/11.2.0/dbhome_1/rdbms/lib/libknlopt.a | grep "kxmnsd.o" > /dev/null 2>&1 ; then echo " " ; else echo "-lordsdo11"; fi` -L/u01/app/oracle/product/11.2.0/dbhome_1/ctx/lib/ -lctxc11 -lctx11 -lzx11 -lgx11 -lctx11 -lzx11 -lgx11 -lordimt11 -lclsra11 -ldbcfg11 -lhasgen11 -lskgxn2 -lnnz11 -lzt11 -lxml11 -locr11 -locrb11 -locrutl11 -lhasgen11 -lskgxn2 -lnnz11 -lzt11 -lxml11  -loraz -llzopro -lorabz2 -lipp_z -lipp_bz2 -lippdcemerged -lippsemerged -lippdcmerged  -lippsmerged -lippcore  -lippcpemerged -lippcpmerged  -lsnls11 -lnls11  -lcore11 -lsnls11 -lnls11 -lcore11 -lsnls11 -lnls11 -lxml11 -lcore11 -lunls11 -lsnls11 -lnls11 -lcore11 -lnls11 -lsnls11 -lunls11  -lsnls11 -lnls11  -lcore11 -lsnls11 -lnls11 -lcore11 -lsnls11 -lnls11 -lxml11 -lcore11 -lunls11 -lsnls11 -lnls11 -lcore11 -lnls11 -lasmclnt11 -lcommon11 -lcore11 -laio    `cat /u01/app/oracle/product/11.2.0/dbhome_1/lib/sysliblist` -Wl,-rpath,/u01/app/oracle/product/11.2.0/dbhome_1/lib -lm    `cat /u01/app/oracle/product/11.2.0/dbhome_1/lib/sysliblist` -ldl -lm   -L/u01/app/oracle/product/11.2.0/dbhome_1/lib

test ! -f /u01/app/oracle/product/11.2.0/dbhome_1/bin/oracle ||\
           mv -f /u01/app/oracle/product/11.2.0/dbhome_1/bin/oracle /u01/app/oracle/product/11.2.0/dbhome_1/bin/oracleO
mv /u01/app/oracle/product/11.2.0/dbhome_1/rdbms/lib/oracle /u01/app/oracle/product/11.2.0/dbhome_1/bin/oracle
chmod 6751 /u01/app/oracle/product/11.2.0/dbhome_1/bin/oracle
[oracle@Testdb lib]$
 

Alright, so it’s done. No errors during the enablement process. Let’s connect with the database and see if the status of the feature.


[oracle@Testdb ~]$ !sql
sqlplus / as sysdba

SQL*Plus: Release 11.2.0.4.0 Production on Mon Sep 16 22:14:59 2019

Copyright (c) 1982, 2013, Oracle.  All rights reserved.

Connected.
SQL> alter system switch logfile;

ERROR at line 1:
ORA-01012: not logged on
Process ID: 0
Session ID: 0 Serial number: 0
 

Oops, why is that. I have set the environmental variables and everything is in place then why it’s not allowing me to connect with the database and say not logged on. This is strange!

Let’s check if there is anything captured withing alert logs and other traces.


Mon Jan 16 22:19:48 2019
WARNING: Oracle executable binary mismatch detected.
 Binary of new process does not match binary which started instance
issue alter system set "_disable_image_check" = true to disable these messages
Process J000 died, see its trace file
kkjcre1p: unable to spawn jobq slave process
Errors in file /u01/app/oracle/diag/rdbms/Testdb/Testdb1/trace/Testdb1_cjq0_176885.trc:
Mon Jan 16 22:19:49 2019
WARNING: Oracle executable binary mismatch detected.
 Binary of new process does not match binary which started instance
issue alter system set "_disable_image_check" = true to disable these messages
Mon Jan 16 22:19:49 2019
Errors in file /u01/app/oracle/diag/rdbms/Testdb/Testdb1/trace/Testdb1_j000_1389.trc:
ORA-27140: attach to post/wait facility failed
ORA-27300: OS system dependent operation:invalid_egid failed with status: 1
ORA-27301: OS failure message: Operation not permitted
ORA-27302: failure occurred at: skgpwinit6
ORA-27303: additional information: startup egid = 54322 (dba), current egid = 54321 (oinstall)
Mon Jan 16 22:19:49 2019
WARNING: Oracle executable binary mismatch detected.
 Binary of new process does not match binary which started instance
issue alter system set "_disable_image_check" = true to disable these messages
 

But it’s all good, no error except a general warning of “_disable_image_check” which happens as we have made a live change and it’s reporting that a mismatch is there at the binary level which were used to start the database instance. This can be easily suppressed by setting the parameter “_disable_image_check” to true.

Alright, so no idea or any hint from alerts and other logs.
Next I have checked the permissions of executable ‘oracle’ under ORACLE_HOME/bin folder.


[oracle@Testdb bin]$ ls -ll oracle
-rwsr-s--x 1 oracle oinstall 228395182 Sep 16 23:02 oracle
 


Why the group has changed from ‘dba’ to ‘oinstall’. This is strange!
Let me revert back the group name and re-assign it back to the older group.


[oracle@Testdb bin]$ chown oracle:dba oracle
 


Second I have noted the change in file permissions. It’s missing the ‘setuid’ access right flag from it, which is present in Node 2 where we didn’t made any change. I have revert back the permissions as well!


[oracle@Testdb bin]$ ls -ll oracle
-rwxr-x--x 1 oracle dba 228395182 Sep 16 23:02 oracle

[oracle@Testdb bin]$ chmod 6751 oracle

[oracle@Testdb bin]$ ls -ll oracle
-rwsr-s--x 1 oracle dba 228395182 Sep 16 23:02 oracle
 

And it worked, no errors this time and I was able to connect with the database using SQL Plus.


SQL> select * from v$option where parameter like 'Real Application Testing';

PARAMETER                                                        VALUE
---------------------------------------------------------------- ----------------------------------------------------------------
Real Application Testing                                         TRUE

SQL> select name, open_mode from v$database;

NAME      OPEN_MODE
--------- --------------------
Testdb  READ WRITE

SQL> select name, open_mode from gv$database;

NAME      OPEN_MODE
--------- --------------------
Testdb  READ WRITE
Testdb  READ WRITE
 

Hope It Helps
Prashant Dixit

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