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    Maxwell Miranda
    Oracle DBA Consultant.
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    August 2009
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    • Flashback database to date back and forth
      Code: --------- SELECT NAME, TIME FROM v$restore_point order by time; NAME TIME ---------------------------------------- ----------------------------------- RST_PNT_20180306_1135 06-MAR-18 AM *Got flashbacked to this 6th Mar* RST_PNT_20180308_0132 08-MAR-18 AM RST_PNT_20180315_0332 15-MAR-18 AM RST_PNT […]
    • Downgrade database from Oracle to Oracle using catdwgrd.sq
      Downgrade database from Oracle to Oracle Like to know if any one successfully downgraded the database from version Oracle 12cR2 ( Release 2) to Oracle 11g Release 2 ( using manual method of catdwgrd.sql. Please share your views and inputs as we are unable to downgrade it successfully. Refereed the https://docs.oracle.com/en/databa […]
    • New user in oracle having access to all tables
      Hi, I have created a new user in oracle database as follows create new user u1 identified by u1; grant create session to u1; when I login with new user ,it has access to all tables in other schema except system and sys tables. i want to create a user who does not have access to any table on any schema. how it can be achieved? Thanks
    • Auditing userid creation, deletion and changes to roles granted.
      Is there an oracle auditing option to audit userid creation, deletion and changes made to the userid (system/object privileges granted or revoked)?
    • ORACLE SQL - Adding Results from Multiple Select Statements
      I apologize if this question is not in the correct area. I have eight select statements, each to get the sum of particular information. These are not simple queries, so I will not include them here. I have made up a simpler version (based on some code I found in a forum) as shown below. So, I have eight sums. I need a ninth sum that is the total of all eight […]
    • Cannot change undo_tablespace parameter in RAC node
      Hi, I am trying to change the undo tablespace in DB instance, unsuccessfully. Approach 1: SQL> show parameter undo NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ temp_undo_enabled boolean FALSE undo_management string AUTO undo_retention integer 900 undo_tablespace string *UNDOTBS2* SQL> SQL> ALTER SYS […]
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Unix commands

Q: How to delete files older than N number of days ? (Useful in delete log, trace, tmp file )
find . -name ‘*.*’ -mtime +[N in days] -exec rm {} \; ( This command will delete files older then N days in that directory, always good to use it when you are in applcsf/ tmp,out,log directory)

Q: How to list files modified in last N days
find . -mtime – -exec ls -lt {} \;

So to find files modified in last 3 days
find . -mtime -3 -exec ls -lt {} \;

Q: How to sort files based on Size of file ? ( useful to find large files in log directory to delete in case disk is full )
ls -l | sort -nrk 5 | more

Q: How to find files changed in last N days (Solaris)
find -mtime -N -print

Q: How to extract cpio file
cpio -idmv < file_name (Don’t forget to use sign b
ln -s b a
(Condition:you should have file b in that directory & there should not be any file with name a)

Q: How to setup cronjob (cronjob is used to schedule job in Unix at O.s. Level )
crontab -l( list current jobs in cron)
crontab -e ( edit current jobs in cron)

_1_ _2_ _3_ _4_ _5_ executable_or_job
1 – Minutes (0-59)
2 – Hours ( 0-24)
3 – day of month ( 1- 31 )
4 – Month ( 1-12)
5 – A day of week ( 0- 6 ) 0 -> sunday 1-> monday

e.g. 0 3 * * 6 Means run job at 3AM every saturday


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