Restrict A User From Being Dropped

Sometimes  we have to  put  the  restriction  on  those  user which  is  having DBA role even though they can't drop a particular schemas . In such scenario's we have to create the triggers to restrict the user   before  the drop command . Below script  will restrict the DBA's  to drop the particular schemas . Here is the triggers.

SQL> Create Or Replace Trigger  TrgDropUserRestrict
Before Drop On Database
Declare
        Begin If Ora_Dict_Obj_Name In ('SCOTT','OUTLN')    Then 
 Raise_Application_Error(-20001,'Cannot Drop User '||ora_dict_obj_name||' Contact Your Database Administrator For Dropping This User !');  
        End If;
End;
/

Enjoy        :-)

Script to Query all table row counts

Once I have to calculate the no. of rows of  all tables in a schema. It seems quite tedious to count rows of all the tables one by one  as  :
SQL>select count(*) from table_name;


The second method is to export the schemas virtually by using the parameter estimate of Datapump. Using this method,we can check the logfile for tables row counts . Even this method is not so efficient because if the schemas size is large then we will take long time. We can export the schemas as
C:\> expdp system/xxxx@noida directory=dpump  schemas=hr logfile=hrlog11.log dumpfile=hr.dmp ESTIMATE=BLOCK

Another option to find table row counts is to use the pl/sql scripts .I found this script from http://www.dba-village.com  and is quite efficient and useful. Here is the below script to check the no. of rows in tables. 

create or replace function table_count (i_table_name varchar2)
return number
as 
 t_cnt number default 0;
begin
 execute immediate 'select count(*) from '||i_table_name into t_cnt;
 return t_cnt;
end;
/
show errors
select table_name, table_count(table_name) from user_tables;
drop function table_count;
Hence, this script allows for counting rows in tables without the need for sqlplus or temporary script files.

If we want to check the empty tables i.e; table not having in any rows can be found from the below scripts :

set termout off

col sql for a120

spool 'C:\checkempty_temp.sql'

set pages 0 feed off echo off

select 

'select '''||owner ||''' owner,'''||table_name||''' table_name  '||chr(10)||

'FROM '||owner||'.'||table_name||' where rownum<2 having count(*)=0; ' sql

from all_tables

where owner not in ('SYS','SYSTEM','OUTLN','WMSYS') and substr(owner,1,4)<>'OPS$'

--and (blocks>0 or last_analyzed is null)

--and owner='XXXX'

--and blocks=0

order by 1;

spool off

set termout on pages 100

@"c:\checkempty_temp.sql"

Enjoy   :-)

WISH YOU ALL A VERY VERY HAPPY DIWALI

May the light that we celebrate at Diwali show us the way and lead us together on the path of peace and social harmony.

           "WISH YOU ALL A VERY HAPPY DIWALI" 

May millions of lamps illuminate your  life with endless joy,prosperity,health & wealth forever.

  

HAVE FUN AND ENJOY DIWALI    :-)