UniBasic Commands Reference - Rocket Software

Parameters
The following table describes each parameter of the syntax.
Parameter Description
1-726 UniBasic Commands Reference
index.name.expr Specifies the alternate key index to use in subsequent
READFWD/READBCK statements.
rop One of several valid operators (see the following table). The default
rop operator is EQ.
, key.val.expr Specifies the key value to initialize. If you do not specify this value,
UniData sets the internal pointer to the first key value in the index.
If you specify FIRST_ALT_KEY, LAST_ALT_KEY, or
NULLVAL_ALT_KEY as rop, you cannot specify key.val.expr.
, id.expr Specifies the @ID associated with the key value to position the
pointer in the index.
When the id.expr entered does not exist, SETINDEX sets the
position to the key value following the expected location of id.expr.
ON file.var Specifies the file to act on.
BUFFER.KEYS
ON | OFF
VALIDATE.KEY
ON | OFF
Directs READFWD/READBCK to use or not use a buffering
mechanism.
ON improves performance, but you could miss some newly added
key values.
OFF (the default) slows performance, but you will not miss any key
values added after the one you just read.
Directs READFWD/READBCK to validate or not validate the key
value just read against what is in the tuple. Because reading a key
value and its tuple is not an atomic action, a tuple could be deleted
after it is read. ON prevents this, but could degrade performance.
SETINDEX Parameters