$LobReserve
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The $LobReserve function returns the number of bytes specified in the RESERVE n BYTES clause for a Store or Add statement of a BINARY-LARGE-OBJECT (BLOB) or a CHARACTER-LARGE-OBJECT (CLOB). A RESERVE n BYTES clause is used when the data being stored will be changed later to a value of n bytes.
The $LobReserve function takes one argument that can be a field name or a field name variable (%%variable).
Syntax
$LobReserve(Large-Object-fieldname | %%variable)