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ops$tkyte@ORA10G> create or replace procedure do_work( p_what in varchar2 ) 2 as 3 l_redo_size number; 4 l_cnt number := 200; 5 6 procedure report( l_op in varchar2 ) 7 is 8 begin 9 select v$mystat.value-l_redo_size 10 into l_redo_size 11 from v$mystat, v$statname 12 where v$mystat.statistic# = v$statname.statistic# 13 and v$statname.name = 'redo size'; 14 15 dbms_output.put_line(l_op || ' redo size = ' || l_redo_size || 16 ' rows = ' || l_cnt || ' ' || 17 to_char(l_redo_size/l_cnt,'99,999.9') || 18 ' bytes/row' ); 19 insert into log 20 select p_what, l_op, data_length, l_redo_size, l_cnt 21 from user_tab_columns 22 where table_name = 'T' 23 and column_name = 'Y'; 24 end; The local procedure SET_REDO_SIZE queries V$MYSTAT and V$STATNAME to retrieve the current amount of redo our session has generated thus far. It sets the variable L_REDO_SIZE in the procedure to that value: 25 26 27 28 29 30 31 32 33 procedure as begin select into from where end; set_redo_size
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v$mystat.value l_redo_size v$mystat, v$statname v$mystat.statistic# = v$statname.statistic# and v$statname.name = 'redo size';
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And then there is the main routine. It collects the current redo size, runs an INSERT/ UPDATE/DELETE, and then saves the redo generated by that operation to the LOG table: 34 35 36 37 38 39 40 begin set_redo_size; insert into t select object_id, object_name, created from all_objects where rownum <= l_cnt; l_cnt := sql%rowcount;
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commit; report('insert'); set_redo_size; update t set y=lower(y); l_cnt := sql%rowcount; commit; report('update'); set_redo_size; delete from t; l_cnt := sql%rowcount; commit; report('delete'); end; /
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Now, once we have this in place, we set the width of column Y to 2,000. We then run the following script to test the three scenarios, namely no trigger, BEFORE trigger, and AFTER trigger: ops$tkyte@ORA10G> exec do_work('no trigger'); insert redo size = 505960 rows = 200 2,529.8 bytes/row update redo size = 837744 rows = 200 4,188.7 bytes/row delete redo size = 474164 rows = 200 2,370.8 bytes/row PL/SQL procedure successfully completed. ops$tkyte@ORA10G> create or replace trigger before_insert_update_delete 2 before insert or update or delete on T for each row 3 begin 4 null; 5 end; 6 / Trigger created. ops$tkyte@ORA10G> truncate table t; Table truncated. ops$tkyte@ORA10G> exec do_work('before trigger'); insert redo size = 506096 rows = 200 2,530.5 bytes/row update redo size = 897768 rows = 200 4,488.8 bytes/row delete redo size = 474216 rows = 200 2,371.1 bytes/row PL/SQL procedure successfully completed. ops$tkyte@ORA10G> drop trigger before_insert_update_delete; Trigger dropped.
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ops$tkyte@ORA10G> create or replace trigger after_insert_update_delete 2 after insert or update or delete on T 3 for each row 4 begin 5 null; 6 end; 7 / Trigger created. ops$tkyte@ORA10G> truncate table t; Table truncated. ops$tkyte@ORA10G> exec do_work( 'after trigger' ); insert redo size = 505972 rows = 200 2,529.9 bytes/row update redo size = 856636 rows = 200 4,283.2 bytes/row delete redo size = 474176 rows = 200 2,370.9 bytes/row PL/SQL procedure successfully completed. The preceding output was from a run where the size of Y was 2,000 bytes. After all of the runs were complete, we are able to query the LOG table and see the following: ops$tkyte@ORA10G> break on op skip 1 ops$tkyte@ORA10G> set numformat 999,999 ops$tkyte@ORA10G> select op, rowsize, no_trig, before_trig-no_trig, after_trig-no_trig 2 from 3 ( select op, rowsize, 4 sum(decode( what, 'no trigger', redo_size/rowcnt,0 ) ) no_trig, 5 sum(decode( what, 'before trigger', redo_size/rowcnt, 0 ) ) before_trig, 6 sum(decode( what, 'after trigger', redo_size/rowcnt, 0 ) ) after_trig 7 from log 8 group by op, rowsize 9 ) 10 order by op, rowsize 11 / OP ROWSIZE NO_TRIG BEFORE_TRIG-NO_TRIG AFTER_TRIG-NO_TRIG ---------- -------- -------- ------------------- -----------------------delete 30 291 0 0 100 364 -1 -0 500 785 -0 0 1,000 1,307 -0 -0 2,000 2,371 0 -0
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