Need to check delays in update of 1000 lines using the PL/SQL procedure.

Hi all

I'm new to PL/SQL. I need your help to build a procedure that executes the following statement and follows the time of update of 1000 rows. This is to check the performance of the database. I need to print the timestamp of start before the update and end timestamp after update. I need to do for the 1000 lines. The statement that will be used in the procedure is:

SELECT

'UPDATE XXAFL_MON_FACTS_F SET TASK_WID =' | NVL (TO_CHAR (TASK_WID), 'NULL') |', EXECUTION_PLAN_WID =' | NVL (TO_CHAR (EXECUTION_PLAN_WID), 'NULL').

"', NO_POSITION =" ' | NVL (TO_CHAR (INSTANCE_NUM), e ') | " ', INSTANCE_NAME = "' | NVL (TO_CHAR (INSTANCE_NAME), 'NULL').

"', DBCONN_NAME =" ' | NVL (TO_CHAR (DBCONN_NAME), e ') | " ', SUCESS_ROWS =' | NVL (TO_CHAR (SUCESS_ROWS), 'NULL').

"', W_INSERT_DT = ' | NVL (TO_CHAR (W_INSERT_DT), 'NULL') |', W_UPDATE_DT = ' | NVL (TO_CHAR (W_UPDATE_DT), 'NULL').

NVL (TO_CHAR (START_TIME), 'NULL') |', END_TIME =' | NVL (TO_CHAR (END_TIME), 'NULL'). "WHERE INTEGRATION_ID ="' | INTEGRATION_ID | " « ; » OF XXAFL_MON_FACTS_F;

The above query creates instructions of update that must be executed 1000 times and the time required to update the 1000 lines should be followed.

Thanks in advance!

Code horribly wrong!

Why this approach?

Dynamic SQL is almost NEVER needed in PL/SQL. And if you think it's necessary and taking into account what is displayed as being problems here, you have a 99% chance of being wrong.

This 1% where dynamic SQL is necessary, he will WITH bind variables to create shareable SQL, decrease memory requests, decrease the likelihood of a fragmented shared reel and decrease the burning CPU cycles on hard analysis.

An example below. Your approach is the 1st. One that is slower than the correct approach to 37 (x_!) ...

SQL> create table t ( n number );

Table created.

SQL>
SQL> var ITERATIONS number;
SQL> exec :ITERATIONS := 100000;

PL/SQL procedure successfully completed.

SQL>
SQL>
SQL> TIMING START "INSERTs using Hard Parsing"
SQL> declare
  2          i      integer;
  3  begin
  4          for i in 1..:ITERATIONS
  5          loop
  6                  execute immediate 'insert into t values ('||i||')';
  7          end loop;
  8          commit;
  9  end;
10  /

PL/SQL procedure successfully completed.

SQL> TIMING SHOW
timing for: INSERTs using Hard Parsing
Elapsed: 00:02:00.33
SQL>
SQL> TIMING START "INSERTs using Soft Parsing"
SQL> declare
  2          i      integer;
  3  begin
  4          for i in 1..:ITERATIONS
  5          loop
  6                  execute immediate 'insert into t values ( :1 )' using i;
  7          end loop;
  8          commit;
  9  end;
10  /

PL/SQL procedure successfully completed.

SQL> TIMING SHOW
timing for: INSERTs using Soft Parsing
Elapsed: 00:00:06.06
SQL> drop table t;

Table dropped.

SQL> create table t( n number );

Table created.

SQL>
SQL>
SQL> TIMING START "INSERTs using a single parse and repeatable statement handle "
SQL> declare
  2          i      integer;
  3  begin
  4          for i in 1..:ITERATIONS
  5          loop
  6                  insert into t values ( i );
  7          end loop;
  8          commit;
  9  end;
10  /

PL/SQL procedure successfully completed.

SQL> TIMING SHOW
timing for: INSERTs using a single parse and repeatable statement handle
Elapsed: 00:00:04.81
SQL>

Tags: Database

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