What are the typical reasons for a high lio when using a Index.

What are the typical reasons for a high lio when using an Index.

I have 2 queries from same 11.2.0.4 tkprof output file. Unable to understand the reason for high lio by SQL1 below:

SQL1:

SELECT col1

FROM

table1 A WHERE col2 = :B2 AND col3 =:B1

call     count       cpu    elapsed       disk      query    current        rows

------- ------  -------- ---------- ---------- ---------- ----------  ----------

Parse        2      0.00       0.00          0          0          0           0

Execute  35148      0.89       0.88          0          0          0           0

Fetch    35148    136.34     139.29        340   28185241          0       35148

------- ------  -------- ---------- ---------- ---------- ----------  ----------

total    70298    137.24     140.18        340   28185241          0       35148

Misses in library cache during parse: 1

Misses in library cache during execute: 1

Optimizer mode: ALL_ROWS

Parsing user id: 85     (recursive depth: 1)

Number of plan statistics captured: 4

Rows (1st) Rows (avg) Rows (max)  Row Source Operation