SQL> set timing on
SQL> select count(*) from t where instr(title,'手册')>0;
COUNT(*)
----------
65881
Elapsed: 00:00:11.04
SQL> select count(*) from t where title like '%手册%';
COUNT(*)
----------
65881
Elapsed: 00:00:31.47
SQL> select count(*) from t where instr(title,'手册')=0;
COUNT(*)
----------
11554580
Elapsed: 00:00:11.31
SQL> select count(*) from t where title not like '%手册%';
COUNT(*)
----------
11554580