On 31 Aug 2017, at 12:10am, Ali Dorri <alidorri...@gmail.com> wrote:
> It works. I think I should a way to calculate this reduction in the size of
> the database as sometimes it seems there is no difference in size (after
> VACUUM) between removing one row or two or three.
> This is a research work so I need it to show me exactly how much data is
> removed.
SQLite databases are stored as pages of a certain length. Each table, each
index, is a sequence of pages. You can delete some data but unless you free up
an entire page, the file won’t get shorter. You can find out how long a page
is using this command
PRAGMA page_size
documented here:
<https://sqlite.org/pragma.html#pragma_page_size>
Simon.
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