clob加||隐式转换造成的性能问题(二)

2014-11-24 16:59:40 · 作者: · 浏览: 1
user id: 61
Rows Row Source Operation
------- ---------------------------------------------------
0 TABLE ACCESS FULL T_CLOB (cr=16 pr=0 pw=0 time=12823 us)

select *
from t_clob
where ',' || cb like ',4'
or ',' || cb like ',16'
or ',' || cb like ',91'


call count cpu elapsed disk query current rows
------- ------ -------- ---------- ---------- ---------- ---------- ----------
Parse 1 0.00 0.03 0 7 15 0
Execute 1 0.00 0.00 0 0 0 0
Fetch 1 0.21 0.20 0 9025 42027 0
------- ------ -------- ---------- ---------- ---------- ---------- ----------
total 3 0.21 0.24 0 9032 42042 0
Misses in library cache during parse: 1
Optimizer mode: ALL_ROWS
Parsing user id: 61
Rows Row Source Operation
------- ---------------------------------------------------
0 TABLE ACCESS FULL T_CLOB (cr=9025 pr=0 pw=0 time=207946 us)