Up through version 7.0, Postgres had serious problems with memory leakage
during large queries that process a lot of pass-by-reference data. There
was no provision for recycling memory until end of query. This needed to be
-fixed, even more so with the advent of TOAST which will allowed very large
-chunks of data to be passed around in the system. This document describes
-the new memory management system implemented in 7.1.
+fixed, even more so with the advent of TOAST which allows very large chunks
+of data to be passed around in the system. This document describes the new
+memory management system implemented in 7.1.
Background