On 20 Jun 2017, at 8:46am, Robert M. Münch <robert.mue...@saphirion.com> wrote:

> The WHERE parts look like this:
> 
> ... WHERE col-1 <> NULL AND col-2 <> NULL ... AND col-x <> NULL
> 
> ... WHERE col-x LIKE ...

My bet is that it’s these clauses which are slowing down execution of your 
command and that the JSON itself isn’t a problem.  You might be able to speed 
up your command by making indexes which allow SQLite to identify the null 
columns very quickly.

Simon.
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