[20241121]测试软软解析遇到的疑惑.txt

[20241121]测试软软解析遇到的疑惑.txt

--//测试软软解析遇到的疑惑，就是大量软软解析以及分散执行两者的执行时间差别并不是很大，有点疑惑，展开分析看看。

1.环境：
SCOTT@book01p> @ver2
==============================
PORT_STRING                   : x86_64/Linux 2.4.xx
VERSION                       : 21.0.0.0.0
BANNER                        : Oracle Database 21c Enterprise Edition Release 21.0.0.0.0 - Production
BANNER_FULL                   : Oracle Database 21c Enterprise Edition Release 21.0.0.0.0 - Production
Version 21.3.0.0.0
BANNER_LEGACY                 : Oracle Database 21c Enterprise Edition Release 21.0.0.0.0 - Production
CON_ID                        : 0
PL/SQL procedure successfully completed.

2.建立测试环境：
create table job_times (sid number, time_ela number,method varchar2(20));

drop table t purge ;
create table t as select rownum id ,'test' pad from dual connect by level<=5e5;
create unique index pk_t on t(id);
exec dbms_stats.gather_table_stats(user, 't', method_opt=>'for all columns size 1');

$ cat m9.txt
set verify off
insert into job_times values (