Syntax: select Yes or No button
Off by default. If on, an all-linear query -one without any
indexable "anchor" words- is allowed. A query like
/money #million", where all the terms use unindexable
pattern matchers (REX, NPM or XPM) is an example. Such a query
requires a linear search of the entire table, and this can be very
slow for a profile of significant size (e.g. 100,000+ documents).
allinear is off, all queries must have at least one term
that can be resolved with the Metamorph index, and a Metamorph
index must exist on the field. Under such circumstances, other
unindexable terms in the query can generally be resolved quickly,
if the "anchor" term limits the linear search to a tiny fraction
of the table. The error message "Query would require linear
search" may be generated by linear queries if this is off.
Note that while enabling linear searches can improve the results of queries where it is needed, it also takes more time and machine resources - even more so that post-processing (here). Thus careful thought should be given when considering enabling it, especially with large (e.g. 100,000+ document) profiles.