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Showing posts from August, 2017

Retrive Exadata Version and Configuration Information

Option 1: Use DBMS_LOB package to get cell configuration information, as column CONFVAL is CLOB
spool confval.txt and search for text make in text file you will see get value in tag <makeModel>  </makeModel>

set pagesize 0
SELECT dbms_lob.substr(CONFVAL,4000,1) from V$CELL_CONFIG;
spool off

This option is good if you don't  have privilege to access storage node and can't execute command Cellcli. You would be able to find out interleaving attribute about Celldisk also as follows.


Explore about interleaving attribute of Celldisk at

Option 2:
From Tanel Podder Blog. I have modified some format to display Make Model properly.
COL cv_cellname       HEAD CELL_NAME        FOR A30
COL cv_cell_path      HEAD CELL_PATH        FOR A30
COL cv_cellversion    HEAD CE…

Oracle ADRCI - Automatic Diagnostic Repository Command Interpreter

adrci - Automatic Diagnostic Repository Command Interpreter

$ adrci
adrci> show homes
Set home for Oracle Database:
adrci> set home
List incidents:
adrci> show incidents
Pack incident for incident number:
adrci> ips pack incident <incident_no> in /tmp
Show incident information in brief:
adrci> show incident -mode brief -p "incident_id=<incident_no>"
Pack incident for problem key (Get problem key by commnad show incidents):
adrci> ips create package problemkey "ORA 600 [qmtGetBaseType]"
Pack incident by time (Get time record by commnd show incidents):
adrci> IPS CREATE PACKAGE TIME '2017-08-23 11:31:44.296000 -07:00' to '2017-08-22 08:32:16.394000 -07:00'


Drop Tuning Set of Oracle Database

Tuning Set Name : Test_TOP_SQL_1503437315950

select name from dba_sqlset;
select * from dba_sqlset where name like 'Test%';
Dropping SQL Task
select name from dba_sqlset;
execute dbms_sqltune.drop_sqlset('Test_TOP_SQL_1503437315950');
You could get an error, if it is reference to advisory task
Get advisory task name
select description, created, owner  from DBA_SQLSET_REFERENCES  where sqlset_name = 'Test_TOP_SQL_1503437315950';
task: SQL_TUNING_1503437363054
select owner,description, created,last_modified from DBA_ADVISOR_TASKS where task_name = 'SQL_TUNING_1503437363054';
execute dbms_sqltune.drop_tuning_task('SQL_TUNING_1503437363054');
execute DBMS_SQLTUNE.drop_sqlset (sqlset_name => 'Test_TOP_SQL_1503437315950');
If you can't drop SQL Set then check whether record exist in work load repository or not
SELECT count(*)  FROM wri$_sqlset_definitions a, wri$_sqlset_references b  WHERE = 'Test_TOP_SQL_1503437315950'  …

Smart scan for ASM disk group in Exadata

Enable smart scan for ASM Disk group while creating disk group in Exadata

DISK 'o/*/DATA*'
          'content.type' = 'data',


Check cell smart scan is enables for ASM disk or not:

 Make sure to connect ASM instance, if you connect to DB instance you won't find value.

SELECT AS diskgroup, SUBSTR(,1,24) AS name, SUBSTR(a.value,1,24) AS value FROM V$ASM_DISKGROUP dg, V$ASM_ATTRIBUTE a
WHERE dg.group_number = a.group_number and a.NAME = 'cell.smart_scan_capable';

EXADATA - Importance of Cellinit.ora and Cellip.ora files
Cellinit.ora and Cellip.ora
After Oracle Exadata Storage Server is configured, …

Kfod tool to inspect ASM disk in Exadata environment

Oracle kfod command line tool for ASM disk inspection:

kfod tool is located in grid home's bin directory.

List optinos for kfod toll using

$kfod -h
_asm_a/llow_only_raw_disks              KFOD allow only raw devices [_asm_allow_only_raw_disks=(TRUE)/FALSE]
_asm_l/ibraries         ASM Libraries[_asm_libraries=lib1,lib2,...]
_asms/id                ASM Instance[_asmsid=sid]
_b/oot          Running in pre-install env (boot=TRUE/FALSE)
_f/lexinfo              Provide flexinfo      (_flexinfo=TRUE/FALSE)
_p/atch_lib             Patchlib [_patch_lib=<asmclntsh_path>]
_u/ser          OS Username
asm_/diskstring         ASM Diskstring [asm_diskstring=discoverystring, discoverystring ...]
asmc/ompatibility               Include diskgroup ASM compatibility [asmcompatibility=TRUE/(FALSE)]
cli/ent_cluster         client cluster name
clus_/version           cluster version
clust/er                KFOD cluster [cluster=TRUE/(FALSE)]
db_/unique_name         db_unique_name for ASM instance…

Oracle Parallel Server Option in Explain Plan

Oracle parallel option:
Parallel option parameter in int.ora:

parallel_degree_level                        integer     100
parallel_degree_limit                        string      CPU
parallel_degree_policy                      string      AUTO
parallel_execution_message_size     integer     15343
parallel_max_servers                        integer     743
parallel_min_servers                         integer     76
parallel_min_time_threshold            string      AUTO
parallel_server                                   boolean     TRUE
parallel_server_instances                  integer     4
parallel_servers_target                      integer     374
parallel_threads_per_cpu                  integer     2

In an explain plan PX stands for Parallel processing.
PX Send are producer
PX Receiver receiver
PX Coordinator
PX COORDINATOR FORCED SERIAL operation means that, although the plan looks like a parallel execution, Oracle effectively will run this serially at execution time.
IN-OUT col…

Oracle - Generate Explain plan and plan statistics for SQL statement

Option 1: Display sql statement execution plan and sql execution statistics also set pagesize 0
set linesize 5000
spool plan_q1.log
set auto trace on
spool off Explain plan could lie explore at
Kerry Osborne's Blog -

Option 2: Use DBMS_XPLAN, get explain plan from awr, using SQL_ID.
set pagesize 0
set linesize 5000
spool plan_q1.log
select * from table(dbms_xplan.display_awr('sql_id'));
spool off
Options for SQL statement:

SELECT plan_table_output FROM TABLE(DBMS_XPLAN.DISPLAY('plan_table',null,'basic +predicate +cost'));
SELECT plan_table_output FROM TABLE(DBMS_XPLAN.DISPLAY('plan_table',null,'typical -cost -bytes'));
SELECT plan_table_output FROM TABLE(DBMS_XPLAN.DISPLAY('plan_table',null,'basic +note'));
Select plan_table_output From table(dbms_xplan.display_cursor(null,null,'TYPICAL');

Find out location of OCR and Voting Disk for Oracle RAC environment

Find out OCR Location for RAC environment:-
Option 1: Get the ocr location form file ocr.loc location at /etc/oracle
cat /etc/oracle/ocr.loc
Option 2: Execute ocrcheck utility form grid home. Typical grid home is Typical grid home is /u01/app/<version>/grid/bin
./ocr check
Find out location of Voting disk:-
Option 1: Query V$ASM_DISK view.
If it is Exadata you would be able to see path as o/cell_ip_address/cell_griddisk_name. i.e. o/
Option 2: Use utility crsctl. crsctl is location in bin directory of grid home. Typical grid home is /u01/app/<version>/grid/bin
./crsctl query css votedisk