APPSDBA Data Lake

  Sometimes database hangs due to many reasons and higher managements look for for RCA. It is important to have all trace file to find the issue for hanging the database or fine the RCA. Get a hang analyze report by running below commands  SQL> sqlplus / as sysdba SQL> oradebug setmypid SQL> oradebug unlimit SQL> oradebug hanganalyze 3 # Wait at least 2-3 minutes to give time to identify process state changes. SQL> oradebug hanganalyze 3 # Wait at least 2-3 minutes to give time to identify process state changes. SQL> oradebug hanganalyze 3 SQL> oradebug tracefile_name SQL> select name, value from v$diag_info where name='Default Trace File'; In case database can't be connected  at all then please do  to the following commands  connect / as sysdba oradebug setmypid oradebug unlimit oradebug dump systemstate 266 -g; oradebug dump systemstate 266 -g; oradebug dump systemstate 266 -g; To generate HANGANALYZE for RAC: SQL> oradebug...

AWR report can be generating in RAC database using 2 scripts awrrpt.sql or awrrpti.sql and It can be generated at the CDB and PDB levels. awrrpt.sql  – > This will generate the one report for the database across all the nodes. awrrpti.sql  – > This will generates report for a particular instance levels. [demantra@dsiddem admin]$ sqlplus "/as sysdba" SQL*Plus: Release 19.0.0.0.0 - Production on Fri Jul 28 13:05:32 2023 Version 19.3.0.0.0 Copyright (c) 1982, 2019, Oracle. All rights reserved. Connected to: Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production Version 19.3.0.0.0 SQL> @ $ORACLE_HOME/rdbms/admin/awrrpt.sql   Specify the Report Type ~~~~~~~~~~~~~~~~~~~~~~~ AWR reports can be generated in the following formats. Please enter the name of the format at the prompt. Default value is 'html'. 'html' HTML format (default) 'text' Text format 'active-html' Includes Performance Hub active re...

 Make Sure oraInst.loc location is correct and accessble. [demantra@dsiddem ~]$ cat /etc/oraInst.loc inventory_loc=/orastage/oraInventory inst_group=dba [demantra@dsiddem ~]$ cd /orastage/oraInventory [demantra@dsiddem oraInventory]$ ls -ltr total 16 drwxrwx---. 5 demantra dba 4096 Jul 22 19:37 backup drwxrwx---. 2 demantra dba 4096 Jul 22 19:37 ContentsXML drwxrwx---. 2 demantra dba 4096 Jul 22 19:37 locks drwxrwx---. 3 demantra dba 4096 Jul 23 10:08 logs Remove Oracle Home from Inventory [demantra@dsiddem oraInventory]$ cd $ORACLE_HOME/oui/bin [demantra@dsiddem bin]$ ./runInstaller -detachHome ORACLE_HOME=$ORACLE_HOME Starting Oracle Universal Installer... Checking swap space: must be greater than 500 MB.   Actual 3039 MB    Passed The inventory pointer is located at /etc/oraInst.loc Run Clone.pl [demantra@dsiddem bin]$ echo $ORACLE_HOME /dnbsid/demantra/oracle/19.0.0 [demantra@dsiddem bin]$ echo $ORACLE_BASE /dnbsid/demantra [demantra@dsiddem bin]$ E01=ORACLE...

 Log in SYSDBA  Check  Tempfile  status SQL> SELECT v.file#, t.file_name, v.status 2 FROM dba_temp_files t, v$tempfile v 3 WHERE t.file_id = v.file#; FILE# FILE_NAME STATUS ---------- ------------------------- ------- 1 /appsolworld/temp01.dbf ONLINE 2 /appsolworld/temp02.dbf ONLINE 3 /appsolworld/temp03.dbf ONLINE  Make it OFFLINE the tempfile that has to move SQL> ALTER DATABASE TEMPFILE '/appsolworld/temp01.dbf' OFFLINE; We should make offline the tempfile that has to move, if not then will get this error : SQL> ALTER DATABASE RENAME FILE '/appsolworld/temp01.dbf' TO '/u02/temp01.dbf'; ALTER DATABASE RENAME FILE '/appsolwolrd/temp01.dbf' TO '/u02/temp01.dbf' * ERROR at line 1: ORA-01511: error in renaming log/data files ORA-01121: cannot rename database file 1026 - file is in use or recovery ORA-01110: data file 1026: '/appsolworld/...

 Overview ======== Here we look at how to write text into a file using the Linux cat command. The cat Command ================ Cat command's common usages is to print the content of a file onto the standard output stream. Other than that, the cat command allows us to write some texts into a file. The Syntax ========== Please look at the general syntax of the cat command: cat [OPTION] [FILE] Copy First, OPTION is a list of flags we can apply to modify the command’s printing behavior,  whereas FILE is a list of files we want the command to read. Making cat Read From stdin ========================== Let’s execute the cat command: cat Now try to enter some texts into the terminal: cat This is a appsolworld This is a appsolworld Once we are done, we can terminate the command by pressing CTRL+D. [demantra@dsiddem demantra]$ cat >> a appsolworld ^C [demantra@dsiddem demantra]$ cat a sfsfsfsd appsolworld [demantra@dsiddem demantra]$ cat > a this [demantra@dsiddem demantra]$ c...

  _FIX_CONTROL is a special hidden dynamic parameter which can be used to enable or disable certain bug fixes. This is typically used in the optimizer area to allow specific fixes to be turned on or off as some fixes can have a significant  effect on execution plans.  we are using the parameter _FIX_CONTROL to  enable or disable specific patches.  The syntax for using _FIX_CONTROL is: To enable: "_fix_control"='Bugno:ON'    (OR)   "_fix_control"="Bugno:1" To disable: "_fix_control"='Bugno:OFF'  (OR)   "_fix_control"="Bugno:0"   For _FIX_CONTROL to work, several conditions must be met:  The patch that is referenced must have the option to use _FIX_CONTROL.  Using _FIX_CONTROL can't be used to back out any patch.  The patch (usually an Optimizer patch)  has to be enabled to use the _FIX_CONTROL parameter. The patch must be installed and visible in the V$SYSTEM_FIX_CONTROL view.  To check this:  ...

Below steps to manually install HR schema in the database: However it can be done during DB creation through DBCA. 1. Log on to sqlplus as SYS AS SYSDBA: [oracle@shsdnbty01 admin]$ sqlplus "/as sysdba" SQL*Plus: Release 19.0.0.0.0 - Production on Fri May 5 22:54:00 2023 Version 19.3.0.0.0 Copyright (c) 1982, 2019, Oracle.  All rights reserved. Connected to: Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production Version 19.3.0.0.0 SQL> show pdbs;     CON_ID CON_NAME                       OPEN MODE  RESTRICTED ---------- ------------------------------ ---------- ----------          2 PDB$SEED                       READ ONLY  NO          3 DB1                            READ WRITE NO SQL> alter session set c...