From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
---|---|
To: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
Cc: | Philip Warner <pjw(at)rhyme(dot)com(dot)au>, Jan Wieck <JanWieck(at)Yahoo(dot)com>, Peter Eisentraut <peter_e(at)gmx(dot)net>, PostgreSQL HACKERS <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: Re: [SQL] Re: [GENERAL] lztext and compression ratios... |
Date: | 2000-07-08 01:49:53 |
Message-ID: | 19527.963020993@sss.pgh.pa.us |
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Lists: | pgsql-general pgsql-hackers pgsql-sql |
>> This remoinded me of a question I wanted to ask Unix people: other OSs I
>> use allow for dynamic linking, at runtime and in code, against shared
>> libraries, and I know Unix must allow this. The places where zlib is used
>> are pretty limited, so it might be worth considering doing the 'HAVE_ZLIB'
>> kinds of checks at runtime. Then one binary fits all...
> We do dynamic loading for functions. Not sure if we want to load zlib
> dynamically if we can help it.
Not bloody likely! Do you want to be in a position where you restart
your postmaster and suddenly chunks of your database are inaccessible?
That's what could happen to you if someone moves or deletes libz.so.
I don't mind being dynamically linked to standard system shared libs;
if libc.so is busted then whether Postgres launches is the least of
your worries. But dynamic dependence on an optional package that's
probably living in /usr/local strikes me as exceedingly risky.
If we do go with using zlib instead of homegrown code, I would recommend
building and statically linking to our own copy even if there is a copy
available on the system. This will prevent cross-version compatibility
problems as well as where'd-my-library-go syndrome. We cannot afford
those sorts of risks for something that could prevent us from reading
our database.
regards, tom lane
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