Question: how does anyone using mySQL keep their tables safe?

I've got two users I'd like mnogo to be using: one, "udm", with a password
that no-one but me [and the indexer] knows, that's going to be used to index
stuff, including writing it to the database.
I want another user, "udm_ro" with a password that anyone who's resouceful
enough can find out. Thing is, user udm needs access to any and all of the
db that it wants. udm_ro needs to be unable to change the data contained in
the database [ergo the name...]. I tried this to revoke everything but
select, but it looks like the search part of mnogo writes temporary tables.

This is probably a mySQL thing I don't understand, but:
GRANT SELECT,INSERT,UPDATE,DELETE,CREATE,DROP ON udmsearch TO
udm_ro@localhost;

Then I tried to revoke
REVOKE INSERT,UPDATE,DELETE,CREATE,DROP ON
udmsearch.ndict2,udmsearch.ndict3,udmsearch.ndict4,udmsearch.ndict5,udmsearc
h.ndict6,udmsearch.ndict7,udsearch.ndict8,udmsearch.ndict9,udmsearch.ndict10
,udmsearch.ndict11,udmsearch.ndict12,udmsearch.ndict16,udmsearch.ndict32,udm
search.categories,udmsearch.affix,udmsearch.spell,udmsearch.server,udmsearch
.url,udmsearch.dict,udmsearch.robots,udmsearch.stopword,udmsearch.qtrack TO
udm_ro@localhost;

Like so, but mySQL told me where to stick that. I don't understand mySQL
well enough to have a clue what's going on, here...

Can anyone please help me with this?

For those who're wondering if it's necessary, I think there are two problems
here:
1: I've mostly solved the problem of people actually getting the passwd with
creative use of .htaccess, plus not many people have access to the box I'm
using.
2: I haven't tested this thoroughly, but I think that people can write dodgy
bits of SQL into the search box and find either a) they can delete tables,
or b) mySQL throws a wobbly.

Thank-you very much,
Gary (-;
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