From: | ZEUGSWETTER Andreas IZ5 <Andreas(dot)Zeugswetter(at)telecom(dot)at> |
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To: | PostgreSQL-development <pgsql-hackers(at)postgreSQL(dot)org> |
Subject: | Re: [HACKERS] sgmr* vs. md* |
Date: | 1999-05-19 12:16:55 |
Message-ID: | 219F68D65015D011A8E000006F8590C60267B36B@sdexcsrv1.f000.d0188.sd.spardat.at |
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Lists: | pgsql-hackers |
> smgr is a generic i/o interface layer that allows multiple storage
> managers. Currently, we always use DEFAULT_SMGR as a parameter to smgr*
> functions, causing calls to the md* routines. Is there any value in
> just removing the smgr layer completely. It was originally for a CD
> jutebox i/o layer in addition to our current disk i/o layer.
>
Wouldn't this be the interface for a tablespace i/o manager ?
A tablespace has the advatage of only needing a number of files
for thousands of small tables, and reduces the overhead of many
open file handles. A tablespace is also needed before raw devices
can be efficiently exploited.
Andreas
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