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Update FAQ_DEV.

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Bruce Momjian
2002-01-03 08:13:51 +00:00
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Developer's Frequently Asked Questions (FAQ) for PostgreSQL
Last updated: Sat Dec 29 23:31:26 EST 2001
Last updated: Thu Jan 3 03:13:44 EST 2002
Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
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2.5) Why do we use palloc() and pfree() to allocate memory?
palloc() and pfree() are used in place of malloc() and free() because
we automatically free all memory allocated when a transaction
completes. This makes it easier to make sure we free memory that gets
allocated in one place, but only freed much later. There are several
contexts that memory can be allocated in, and this controls when the
allocated memory is automatically freed by the backend.
we find it easier to automatically free all memory allocated when a
query completes. This assures us that all memory that was allocated
gets freed even if we have lost track of where we allocated it. There
are special non-query contexts that memory can be allocated in. These
affect when the allocated memory is freed by the backend.
2.6) What is elog()?