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Oracle v$sqlarea script

Chapter 2 Inside the Oracle Shared Pool

The sample report above was generated to force a read count of 10. Usually, disk reads will be in the range specified by the define statement. By tuning those statements which show large amounts of disk reads, the overall performance of the application is increased.

In Oracle9i the v$sqlarea DPT has been expanded to include timing data related to total elapsed time and elapse CPU time. These timing statistics help the DBA to monitor for SQL that is using the majority of time for its parsing and execution. The following select shows how to pull the top X SQL statements from the v$sqlarea DPT.

SELECT * FROM(
SELECT
sql_text,
ceil(cpu_time/greatest(executions,1)) ave_cpu_time,
ceil(elapsed_time/greatest(executions,1)) ave_elapsed_time,
ceil(disk_reads/greatest(executions,1)) ave_disk_reads,
persistent_mem per_mem, runtime_mem run_mem,
ceil(sorts/greatest(executions,1)) ave_sorts,
ceil(parse_calls/greatest(executions,1)) ave_parse_calls,
ceil(Buffer_gets/greatest(executions,1)) ave_buffer_gets,
ceil(rows_processed/greatest(executions,1)) ave_row_proc,
ceil(Serializable_aborts/greatest(executions,1)) ave_ser_aborts
FROM
v$sqlarea

EE CODE DEPOT FOR FULL SCRIPT
OR
Elapsed_time/greatest(executions,1)>&&elapsed_time
order by elapsed_time, cpu_time, disk_reads)
where rownum<&&num_sql
/
 

An example result from the above SELECT would resemble:


                                     AVG   AVG  AVG                    AVG  AVG  AVG   AVG
                                     CPU   Elap Disk  Per.  Run. AVG  Parse Buff Rows  Ser. SQL                                  Time  Time Reads Mem   Mem  Sorts Calls Gets Proc Aborts
------------------------------------ ---- ----- ----- ---- ----- ----- ----- ---- ---- ------
SELECT INET_ADDRESS, PORT, LISTENER,    0 10000     2  792  6520   0     1   31    2     0
PRESENTATION, OPTIONS FROM
AURORA$DYN$REG                                   
 
select schema, classname from           0 10000     2  624  5344   0     1   19    2     0
aurora$startup$classes$                         
                                               
SELECT max(version) FROM                0  5000     1  568  1656   0     1   11    1     0
"SYS"."JAVA$POLICY$SHARED$TABLE"                
 
SELECT /* DBA_UTIL. GET_DELTA */       82    82     0  648  2880   0     1    3    0     0
:b4-a.value   FROM  dba_running_stats a         
WHERE  a.name=:b3 and  a.meas_date              
between :b1-35/1440 and :b1-25/1440       

 



 

The Oracle script collection contains more than 600 working Oracle scripts.  You can download them immediately at this link:
 


 

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