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     Oracle: custom SQL report

 
The purpose of this assignment is to create a customized SQL query from the data dictionary to display information about SQL statements inside the library cache.
 
As we know from the exercise, the v$sql, v$process and v$sql_plan views all contain a common address column that can be used to join the tables together with SQL.
 
Step 2- Connect to SQL*Plus as pubs/pubs and run queries q1.sql through q5.sql against the pubs database to load-up the library cache with SQL statements.
 
Step 2 - Run the following query to display all non-system SQL in the library cache.
 
select
   sql_text
from
   v$sql      sq,
   v$sql_plan se
where
   sq.address = se.address
and
   object_owner not in ('SYS','SYSTEM','AURORA$JIS$UTILITY$')
;
 
Paste this script into a file on your PC, open an MS-DOS window, use the “cd” command to go that directory, and then enter SQL*Plus with the following command:
 
sqlplus system/manager@mydatabase
 
Now you can ruin the program using the “@” command.  For example, if I called the code sql_text.sql, we can execute the script by entering:
 
SQL> @sql_text
 
Step 3 – Now, enhance the above code snippet to include the following columns from the v$sql view:
 
 
First_load_time – The date and time that the SQL first appeared in the library cache
 
Sorts – The number of sorts that Oracle has invoked by executing this SQL statement
 
Parse_calls – The number of times that this SQL statement has been parsed.  If the statement is reentrant, you will see multiple parse calls for the SQL statement
 
Rows_processed – The total number of data rows returned for the sum of all invocations of this SQL statement.
 
 
You can use the “host notepad sql_text.sql” command directly from inside SQL*Plus to edit your code.
 
 
Your output will look something like this:
 
FIRST_LOAD_TIME            SORTS  PARSE_CALLS EXECUTIONS ROWS_PROCESSED        
------------------- ------------- ----------- ---------- ---
SQL_TEXT                                                                       
----------------------------------------                                       
2002-05-18/14:14:44             0           1          1             10        
select * from store                                                             
                                                                               
2002-05-18/14:14:16             0           1          1             19        
select * from book                                                              
                                                                               
2002-05-18/14:14:32             0           1          1             10        
select * from author                                                            
                             
Once you get your script running, copy it into an e-mail and send it to your instructor.
 
ANSWER KEY:
 
select
   first_load_time   ,
   invalidations     ,
   parse_calls       ,
   executions        ,
   rows_processed    ,
   sql_text
from
   v$sql      sq,
   v$sql_plan se
where
   sq.address = se.address
and
   object_owner not in ('SYS','SYSTEM','AURORA$JIS$UTILITY$')


 

For a complete overview of Oracle SQL, see the book "Easy Oracle SQL".  It's only $9.95 and has a downloadable code depot:

http://www.rampant-books.com/book_2005_1_easy_sql.htm

     

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