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Don Burleson Blog 







v$sql scripts

Oracle Database Tips by Donald BurlesonApril 14, 2015

Question:  What are the ways to see SQL inside the library cache using the v$sql view?

Answer:  The v$sql view has related views such as v$object_dependency, v$db_object_cache, views, plus v$sql_workarea, v$session, and v$sql_plan.

If you are not expert at dictionary scripts, I recommend downloading the Oracle script collection for ready-to-run scripts.  Also see these v$sql notes:

- Real Time SQL Monitoring with v$sql

- Query for active users with v$sql and v$session

To understand the complexity of a v$sql script, here is a sample v$sql query, showing the complexity of a v$sql query:

ttitle "Count of SQL executions by minute in cache." 
break on exec skip 2
   exec ,
   substr(min_Cached,5)     min_Cached,
   round(avg(Executions),2) avg_exec,
   sum(executions)          executions,
   min(executions)          min_Exec,
   max(executions)          max_Exec,
   round(sum(optimizer_cost),0) Cost
 ,substr(to_char(100 * ratio_to_report(sum(optimizer_cost)) over (), '999.00'), 2) || '%'  pct_cost
  from (
    select decode(executions,0,0,1,1,2,2) exec,
          0,' 1) 00-01min',
          1,' 2) 01-02min',
          2,' 2) 01-02min',
          DECODE(SIGN(Min_Cached-    6),-1,' 3) 03-05min',
          DECODE(SIGN(Min_Cached-   16),-1,' 4) 06-15min',
          DECODE(SIGN(Min_Cached-   31),-1,' 5) 16-30min',
          DECODE(SIGN(Min_Cached-   61),-1,' 6) 31-60min',
          DECODE(SIGN(Min_Cached-  121),-1,' 7)  1- 2hr',
          DECODE(SIGN(Min_Cached-  180),-1,' 8)   - 3hr',
          DECODE(SIGN(Min_Cached-  240),-1,' 9)   - 4hr',
          DECODE(SIGN(Min_Cached-12*60),-1,'10)   -12hr',
               '11) 12hr+  '))))))))) Min_Cached,
          from (
                  'yyyy-mm-dd/hh24:mi:ss'))*24*60) min_Cached,
                  see code download for full scripts
                  parsing_User_ID != 0
                  executions > 0
group by 
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Oracle SQL Tuning Information 

The landmark book "Advanced Oracle SQL Tuning  The Definitive Reference"  is filled with valuable information on Oracle SQL Tuning. This book includes scripts and tools to hypercharge Oracle 11g performance and you can buy it for 30% off directly from the publisher.



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