Go to card has become slow

Mark Waddingham mark at livecode.com
Fri Apr 3 04:42:33 EDT 2020

On 2020-04-03 09:25, Terence Heaford via use-livecode wrote:
> Fortunately I have Time Machine running on my mac.
> I have gone back to a previous copy from the 01 April 2020 and this
> project is running at full speed.
> I have made no modifications to the underlying functionality of this
> project other than some modifications to SQLite
> scripts to improve performance.
> I will make those adjustments again and report on the outcome.
> I do not believe it’s anything I have done.

I'd humbly  suggest that modifications to SQLite scripts constitute 
modifications ;)

Have you modified the SQLite database in any way?

Like most db's SQLite is heavily dependent on indices to prevent 
operations being slow - if some have been removed which existing queries 
relied upon, or one hasn't been added to support a new/modified query 
then that could cause a heavy performance loss.

Similarly, SQLite is transactional, so if you do lots of mutation 
queries outside of one each individual query will take a lot longer (as 
each will be under its own transaction requiring a OS disk flush/sync 
after each) - if you've tweaked how you are doing such queries and not 
taken into account transactions that could also cause a heavy 
performance loss.

Warmest Regards,


Mark Waddingham ~ mark at livecode.com ~ http://www.livecode.com/
LiveCode: Everyone can create apps

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