Table of Contents
Advertisement
CHAPTER 5
You can specify load options in any order. Syntax for load-options is as
follows:
[ { BLOCK FACTOR number | BLOCK SIZE number } ]
... [ BYTE ORDER { NATIVE | HIGH | LOW } ]
... [ LIMIT number-of-rows ]
... [ NOTIFY number-of-rows ]
... [ ON FILE ERROR { ROLLBACK | FINISH | CONTINUE} ]
... [ PREVIEW { ON | OFF } ]
... [ ROW DELIMITED BY ' delimiter-string ' ]
... [ SKIP number-of-rows ]
... [ START ROW ID number ]
... [ UNLOAD FORMAT ]
Each of these options is described briefly below. For details of all options of
the
statement, see the Adaptive Server IQ Reference.
LOAD TABLE
BLOCK FACTOR option
per block, used when a source was created. This option is not valid for
insertions from variable length input fields; use the
instead. However, it does affect all file inserts (including from disk) with fixed
length input fields, and it can affect performance dramatically.
The default setting for
BLOCK FACTOR
generally improve the speed of I/O operations. However, consider the
following when setting this option:
•
If your source is a disk file, memory considerations will determine the best
setting for your system.
•
If your source is a tape, either use the same blocking factor that was used
when creating the tape (for best performance) or a blocking factor that is
evenly divisible into it.
•
Adaptive Server IQ rejects the insert operation if you specify a
of zero.
FACTOR
•
You cannot specify
BLOCK FACTOR
variable-width input fields.
ESCAPE CHARACTER option
The default escape character for characters stored as hexadecimal codes and
symbols is a backslash (\), so that \x0A is the linefeed character, for example.
This can be changed using the
use the exclamation mark as the escape character, you would enter:
... ESCAPE CHARACTER '!'
Moving Data In and Out of Databases
Specifies blocking factor, or number of records
BLOCK SIZE
is 10,000. Higher block factors
along with
BLOCK SIZE
Specifies an alternative escape character.
clause. For example, to
ESCAPE CHARACTER
option
BLOCK
or with any
181
Advertisement
Table of Contents
