Sqlldr bindsize parameter

Question

Using sqlldr to import data:
sqlldr ${user_id} control=${ctl_file} rows=10000 bindsize=8192 readsize=8192 errors=999999 log=${log_file}/${today_DATE}.log
When executing:
Commit point reached - logical record count 2
Commit point reached - logical record count 4
Commit point reached - logical record count 6
Commit point reached - logical record count 8
Commit point reached - logical record count 10
Commit point reached - logical record count 12
In data file, there is only 80 characters(that is 80 bytes) in every row. However, in log file:
Space allocated for bind array: 6714 bytes(2 rows)
Why 6714 bytes is here? Except the 160 bytes for two rows, what's the other sizes?
Thanks a lot for your kindly reply.

Answer 1

Thanks.
Table has 14 fields:
create table TBL
A VARCHAR2(3) not null,
B VARCHAR2(10) not null,
C VARCHAR2(5) not null,
D VARCHAR2(1) not null,
E VARCHAR2(4) not null,
F VARCHAR2(4) not null,
G VARCHAR2(6) not null,
H VARCHAR2(1) not null,
I VARCHAR2(1) not null,
J VARCHAR2(5) not null,
K VARCHAR2(6) not null,
L VARCHAR2(1) not null,
M TIMESTAMP(6) not null,
N VARCHAR2(2) not null
The size of all columns is about 55 bytes. Binsize is 8192 in control file, However, two lines import once a time when executing. Obviously, it is not "55" for actually. Control file is like:
TRUNCATE
INTO TABLE TBL
FIELDS TERMINATED BY X'09'
TRAILING NULLCOLS
(A                       "upper(trim(:A))"
,B                       "upper(trim(:B))"
,C                       "upper(trim(:C))"
,D                       "upper(trim(:D))"
,E                       "upper(trim(:E))"
,F                       "upper(trim(:F))"
,G                       "upper(trim(:G))"
,H                       "upper(trim(:H))"
,I                       "upper(trim(:I))"
,J                       "upper(trim(:J))"
,K                       "upper(trim(:K))"
,L                       "upper(trim(:L))"
,M                       "upper(trim(:M))"
,N                       "upper(trim(:N))"
It is not "14*255" as you said.
Could you give me some advice? Thanks a lot.