Dear Postgresql experts,
I have a single database with one schema per user. Each user has a handful of tables, but there are lots of users, so in total the database has thousands of tables.
I'm a bit concerned about scalability as this continues to grow. For example I find that tab-completion in psql is now unusably slow; if there is anything more important where the algorithmic complexity is the same then it will be causing a problem. There are 42,000 files in the database directory. This is enough that, with a "traditional" unix filesystem like ext2/3, kernel operations on directories take a significant time. (In other applications I've generally used a guide of 100-1000 files per directory before adding extra layers, but I don't know how valid this is.)
I'm interested to know if anyone has any experiences to share with similar large numbers of tables. Should I worry about it? I don't want to wait until something breaks badly if I need architectural changes. Presumably tablespaces could be used to avoid the too-many-files-per-directory issue, though I've not moved to 8.0 yet.
Thanks
Phil.
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