manual.texi:

The last form closes the table, opened with @code{HANDLER ... OPEN}.

@code{HANDLER} is somewhat low-level statement, for example it does not

provide consistency. That is @code{HANDLER ... OPEN} does @strong{NOT}

takes a snapshot of the table, and does @strong{NOT} locks the table. The

above means,  that after @code{HANDLER ... OPEN} table data can be

modified (by this or other thread) and these modifications may appear only

partially in @code{HANDLER ... NEXT} or @code{HANDLER ... PREV} scans.

@code{HANDLER} is somewhat of a low-level statement, for example it does

not provide consistency,  that is @code{HANDLER ... OPEN} does @strong{NOT}

take a snapshot of the table, and does @strong{NOT} lock the table. This

means that after a @code{HANDLER ... OPEN} is issued, table data can be

modified (by this or an other thread) and these modifications may only

partially appear in @code{HANDLER ... NEXT} or @code{HANDLER ... PREV} scans.

@node INSERT, INSERT DELAYED, HANDLER, Data Manipulation