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pg_toast_temp_xx AND pg_temp_xx SCHEMAS

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Hi guys,
 
In one of my databases (8.3.6) I have around 25 schemas with names like
these. There seem to appear a couple of new ones every now and then.
 
The only reference I found was this:
--- 
http://www.postgresql.org/docs/8.3/static/release-8-3.html

* Place temporary tables' TOAST tables in special schemas named
pg_toast_temp_nnn (Tom) 

This allows low-level code to recognize these tables as temporary, which
enables various optimizations such as not WAL-logging changes and using
local rather than shared buffers for access. This also fixes a bug wherein
backends unexpectedly held open file references to temporary TOAST tables. 
---

Could anyone point me out some documentation about what these schemas mean?
Should I be worried? Anything I should do about it?
 
Thanks,
Fernando


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