[arch-general] Implement sql/sqlite database for pacman local database

[Tinu Weber]

On Fri, Oct 21, 2016 at 17:20:53 +0000, Alive 4ever wrote:
> [...] It seems that the local pacman databases are just subdirectories
> with text files (desc, files) and gzipped text (mtree).
> No wonder why local pacman databases tend to slow down over time and
> need to be optimized periodically.
This is a little contradictory: if it is just directories with text
files (plain or compressed), how does it need "periodical optimisation"?
What is optimised? And how?

> This would provide faster access for local database as sql databases
> are optimized for fast access.
This just adds complexity, and for what? Marginal performance gain (if
at all? honestly, `pacman -Q` runs almost instantly here).

Best,
Tinu/ayekat
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