oracle绑定变量与非绑定变量的性能对比
create table t ( x int );
create or replace procedure proc1
as
begin
for i in 1 .. 10000
loop
execute immediate
'insert into t values ( :x )' using i;
end loop;
end;
/
create or replace procedure proc2
as
begin
for i in 1 .. 10000
loop
execute immediate
'insert into t values ( '||i||')';
end loop;
end;
/
/* 这里用到的包在上一篇文章里 */
exec runstats_pkg.rs_start;
exec proc1;
exec runstats_pkg.rs_middle;
exec proc2;
exec runstats_pkg.rs_stop(10000);
Run2 ran in 723 cpu hsecs
run 1 ran in 20.06% of the time
Name Run1 Run2 Diff
STAT...enqueue requests 32 10,062 10,030
STAT...enqueue releases 30 10,062 10,032
STAT...parse count (hard) 4 10,053 10,049
STAT...parse count (total) 11 10,061 10,050
STAT...consistent gets from ca 33 10,344 10,311
STAT...session logical reads 10,387 20,851 10,464
STAT...consistent gets from ca 55 10,581 10,526
STAT...consistent gets 55 10,581 10,526
LATCH.cache buffers chains 51,092 61,884 10,792
LATCH.enqueue hash chains 135 20,383 20,248
LATCH.enqueues 122 20,379 20,257
STAT...recursive calls 10,080 41,229 31,149
LATCH.kks stats 9 57,015 57,006
LATCH.row cache objects 180 92,241 92,061
LATCH.shared pool simulator 20,125 172,276 152,151
LATCH.shared pool 20,241 357,950 337,709
STAT...physical read total byt 0 598,016 598,016
STAT...physical read bytes 0 598,016 598,016
Run1 latches total versus runs -- difference and pct
Run1 Run2 Diff Pct
92,892 789,588 696,696 11.76%
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转载于:http://blog.itpub.net/12554513/viewspace-675150/