Configure NTP (Network Time Protocol) clients on AIX

How to configure NTP on client with a NTP server .Our NTP servers  are   time_server01 and  time_server02

1. Verify that you have a server suitable for synchronization offset  must  be smaller  then 1000 ms 
   #ntpdate -d time_server01
2. Check if it is  running  or  not (configured  before)
   #lssrc -ls xntpd
3. Specify your ntp servers in /etc/ntp.conf  .Comment out the “broadcastclient” line (if applicable )
   #vi /etc/ntp.conf
   
   server    time_server01 prefer
   server    time_server02
   driftfile /etc/ntp.drift
   tracefile /etc/ntp.trace
   #broadcastclient
4. Be sure  that  you can rach time servers .if you define  a server  name  (not an IP be sure that you can  reach it ).You can add it  in /etc/hosts
   
   #vi /etc/hosts
   10.1.1.10       time_server01
   10.1.1.11       time_server02
   
   #ping  time_server01
   #nslookup time_server01
5. start  stop
   #stopsrc -s xntpd
   #startsrc -s xntpd
6. check  if it is  running  and  Sys peer should display the IP address or name of your xntp server. This process may take up to 15 minutes
   
   #lssrc -ls xntpd
   #lssrc -ls xntpd|grep "Sys peer"
   #ntpq -p
7. Uncomment xntpd from /etc/rc.tcpip so it will start on a reboot.
   
   # vi /etc/rc.tcpip
   Uncomment the following line:
   start /usr/sbin/xntpd "$src_running"
   
   

Disk performance test with IBM ndisk64 tool

ndisk64 is  an IBM free tool to measure  IO performance of   your  disk .
You can download  and  get information  from http://www.ibm.com/developerworks/wikis/display/WikiPtype/nstress

• I have  created  7   different 10g files on all mout points in order  to  spread   IO
  dd if=/dev/zero of=/datac1/bigfile1 bs=1m count=10240
  dd if=/dev/zero of=/datac2/bigfile2 bs=1m count=10240
  dd if=/dev/zero of=/datac3/bigfile3 bs=1m count=10240
  dd if=/dev/zero of=/datac4/bigfile4 bs=1m count=10240
  dd if=/dev/zero of=/datac5/bigfile5 bs=1m count=10240
  dd if=/dev/zero of=/datac6/bigfile6 bs=1m count=10240
  dd if=/dev/zero of=/datac7/bigfile7 bs=1m count=10240
• Put the names  of the files  to   a  input file
  
  echo "/datac1/bigfile1" >filelist
  echo "/datac2/bigfile2">>filelist
  echo "/datac3/bigfile3">>filelist
  echo "/datac4/bigfile4">>filelist
  echo "/datac5/bigfile5">>filelist
  echo "/datac6/bigfile6">>filelist
  echo "/datac7/bigfile7">>filelist
• Identify  some  system values and  also  define some assumptions   about  your  system my assumptions and system   values  are
  
  Block size=8k
  Read-WriteRatio: 70:30 = read mostly(OLTP)
  Timed duration of the test in seconds =120
   Mutliple processes used to generate =3
• Start  test  for different multiple  process
     /home/sturgut/ndisk64 -F filelist  -S -r70 -b 8k -t 120  -M3
  Command: /home/sturgut/ndisk64 -F filelist -S -r70 -b 8k -t 120 -M3
          Synchronous Disk test (regular read/write)
          No. of processes = 3
          I/O type         = Sequential
          Block size       = 8192
          Read-WriteRatio: 70:30 = read mostly
          Sync type: none  = just close the file
          Number of files  = 7
          File size        = 33554432 bytes = 32768 KB = 32 MB
          Run time         = 120 seconds
          Snooze %         = 0 percent
  ----> Running test with block Size=8192 (8KB) ...
  Proc - <-----disk io----=""> | <-----throughput------> RunTime
   Num -     TOTAL   IO/sec |    MB/sec       KB/sec  Seconds
     1 -   2523632  21030.3 |    164.30    168242.34 120.00
     2 -   2442193  20351.6 |    159.00    162813.09 120.00
     3 -   2097104  17475.9 |    136.53    139807.03 120.00
  TOTALS   7062929  58857.8 |    459.83 Seq procs=  3 read= 70% bs=  8KB
• In another session Monitor  IO service times using # iostat -RDTl
• Increase  the different multiple process  and monitor  the  service time .Create a IOPS vs. IO service time chart
• Increase the number of threads to get a peak IOPS
• Be sure your queue_depth is >= number of threads
• More than queue_depth x 2 threads won’t increase thruput

Disable or Enable all Oracle jobs

There  are two  kinds  of  jobs  dbms_job and  dbms_scheduler  jobs

1. Disable
• dbms_job
  alter system set  job_queue_processes=0;
• dbms_scheduler
  exec dbms_scheduler.set_scheduler_attribute('scheduler_disabled','true');
2. Enable
• dbms_job
  alter system set job_queue_processes=10;
• dbms_scheduler
  exec dbms_scheduler.set_scheduler_attribute('scheduler_disabled','true');

ORA-08104: this index object 136450 is being online built or rebuilt

Problem:While running an online index rebuild your session was killed  so  second attemp will give  following error.

alter index MARDATA.COR_VERGI_NO_HAR_X2  rebuild online
tablespace MARBASINDEX_1M storage(initial 1m next 1m) compress 2;

ERROR at line 1:

ORA-08104: this index object 136450 is being online built or rebuilt
Cause:
you have not installed the patch for Bug 3805539 or are not running on a release that includes this fix.So smon is   very slow   in cleaning up 

Solution:Use  dbms_repair.online_index_clean to  clean  up .

declare
  result boolean ;
begin
result:=DBMS_REPAIR.ONLINE_INDEX_CLEAN(dbms_repair.all_index_id,dbms_repair.lock_wait);
end ;
/

After  then you can   rebuild index.

How to flush a single SQL from shared pool

Use  DBMS_SHARED_POOL.purge
exec  DBMS_SHARED_POOL.purge('ADRESS,HASH_VALUE','C',1);
Example :
 select address,hash_value, executions, loads, version_count,
 invalidations, parse_calls
 from v$sqlarea
 where sql_text like 'UPDATE OTPL_BASVURU_KULLANICI SET ORDER_ID%';

ADDRESS HASH_VALUE EXECUTIONS LOADS VERSION_COUNT INVALIDATIONS PARSE_CALLS
---------------- ---------- ---------- ---------- ------------- ------------- -----------
070000012EC6FB98 3630826165 1 1 1 0 1
alter session set events '5614566 trace name context forever';    --for  10.2.0.4 or 10.2.0.5
 EXEC SYS.DBMS_SHARED_POOL.purge('070000012EC6FB98,3630826165','C',1);


or another   flush  sql 

alter session set events '5614566 trace name context forever';


select  ' EXEC SYS.DBMS_SHARED_POOL.purge('''||address||','||to_char(hash_value)||''',''C'',1);'
from  v$sqlarea where hash_value=&hash_value;


Note1:Be careful usage  of   'ADRESS,HASH_VALUE'      not  'ADRESS','HASH_VALUE'

Note2:The create statement for this package can be found in the $ORACLE_HOME/rdbms/admin/dbmspool.sql script

Note3:DBMS_SHARED_POOL.PURGE is available from 11.1. In 10.2.0.4, it is available through the fix for Bug 5614566. However, the fix is event protected. You need to set the event 5614566 to make use of purge. Unless the event is set, dbms_shared_pool.purge will have no effect.


event="5614566 trace name context forever"   #in init.ora for 10.2.0.4 or 10.2.0.5
or 
alter session set events '5614566 trace name context forever';

How to compile Invalid Object?

Operations such as upgrades, patches and DDL changes can invalidate schema objects.Here are  some  methods  to compile   objects .But I prefer  UTL_RECOMP (from sql  or PL/SQL ) or  $ORACLE_HOME/rdbms/admin/utlrp.sql (From Operting system)

1.  we  can  compile it manually like 
    alter  package serdar.xxx compile  body  ;
2. Manuel by the help  of a  script:we can  spool  the output  and  run it.Note  that  this script is not written for all types  like java classes
   
   Set heading off;
   set feedback off;
   set echo off;
   Set lines 999;
   spool compile.sql
   
   select  'alter '||
   decode(object_type,'SYNONYM',decode(owner,'PUBLIC','PUBLIC SYNONYM '||object_name,
   'SYNONYM '||OWNER||'.'||OBJECT_NAME)||' compile;',
   decode(OBJECT_TYPE ,'PACKAGE BODY','PACKAGE',OBJECT_TYPE)||
   ' '||owner||'.'||object_name||' compile '||
   decode(OBJECT_TYPE ,'PACKAGE BODY','BODY;',' ;'))
   from dba_objects where status<>'VALID'
   order by owner,OBJECT_NAME;
   spool off
   @compile.sql
   
   
   
3. DBMS_DDL.ALTER_COMPILE: The same with "alter   procudere serdar.test compile"
   
   exec dbms_ddl.alter_compile ('PROCEDURE','SERDAR','TEST');
4. DBMS_UTILITY.compile_schema:The COMPILE_SCHEMA procedure in the DBMS_UTILITY package compiles all procedures, functions, packages, and triggers in the specified schema
   
   EXEC DBMS_UTILITY.compile_schema(schema => 'SERDAR');
5. UTL_RECOMP :it will  recompile all invalids.
   
   --Compile  all invalids  in the database
   exec  SYS.UTL_RECOMP.RECOMP_SERIAL ();
   --Compile schema  SERDAR
   exec SYS.UTL_RECOMP.RECOMP_SERIAL ('SERDAR');   
   
   --Compile all invalids in the database parallel (If we  have eneogh  CPU )
   
   exec  SYS.UTL_RECOMP.recomp_parallel(4);
6. UTLRP.SQL  : From  the  operating  system as sysdba.Note that this is an example  for UNIX systems
   
   SQL>@$ORACLE_HOME/rdbms/admin/utlrp.sql
   
    

How to Recreate the OraInventory on UNIX Systems

How can I recreate the OraInventory  if it gets  removed

1. Locate the oraInst.loc file, which may be in different locations, depending on your system
   /var/opt/oracle/oraInst.loc file
   or
   /etc/oraInst.loc
2. Modify the file oraInst.loc file
   cp /etc/oraInst.loc /etc/oraInst.loc.bak     #e.x for AIX run with rot
   
   mkdir /data1/oracle2/oraInventory          #path is examp.Change it .run with oracle owner user
3. Change oraInst.loc
   inventory_loc=/data1/oracle2/oraInventory
   
   inst_group=oinstall #it can be also dba
4. Change the permissions
   chmod 644 /etc/oraInst.loc
5. For consistency, copy the file to Oracle home directory, (using your directory location):
   
   cp $ORACLE_HOME/oraInst.loc $ORACLE_HOME/oraInst.loc.bak
   
   cp /etc/oraInst.loc                  $ORACLE_HOME/oraInst.loc
6. Run Oracle Universal Installer from your Oracle home as below:
   
   cd $ORACLE_HOME/oui/bin
   
   ./runInstaller -silent -attachHome ORACLE_HOME="/data1/oracle2/orahome10gr2" ORACLE_HOME_NAME="PARTEST"
   
   Note: The -attachHome is only officially supported in 10.2 and higher. But, we found it works on our testing with 10.1.2
7. Check the inventory output is correct for your Oracle home:
   $ORACLE_HOME/OPatch/opatch lsinventory -detail