Update of /cvsroot/monetdb/MonetDB5/src/mal
In directory sc8-pr-cvs16.sourceforge.net:/tmp/cvs-serv25239/src/mal
Modified Files:
mal_recycle.mx
Log Message:
make is more readable
Index: mal_recycle.mx
===================================================================
RCS file: /cvsroot/monetdb/MonetDB5/src/mal/mal_recycle.mx,v
retrieving revision 1.1
retrieving revision 1.2
diff -u -d -r1.1 -r1.2
--- mal_recycle.mx 2 Mar 2008 07:45:50 -0000 1.1
+++ mal_recycle.mx 2 Mar 2008 08:44:16 -0000 1.2
@@ -18,32 +18,32 @@
@f mal_recycle
@- The Recycler
Query optimization and processing in off-the-shelf database systems is often
-still focus on individual queries. The queries are analysed in isolation
+still focussed on individual queries. The queries are analysed in isolation
and ran against a kernel regardless opportunities offered by concurrent or
previous invocations.
This approach is far from optimal and two directions to improve
are explored: materialized views and (partial) result-set reuse.
Materialized views are derived from query logs. They represent
-common sub-queries, whose materializaion and storage improves
-subsequent processing time.
+common sub-queries, whose materialization improves
+subsequent processing times.
Re-use of (partial) results is used in those cases where a
-zoomin-in or navigational application is at stake.
+zooming-in or navigational application is at stake.
-The Recycler module extends it with a the middle out approach.
-It exploits the materialize-all-intermediate approach MonetDB
-by deciding to keep hold on them as long as deemed benificial.
+The Recycler module extends it with a middle out approach.
+It exploits the materialize-all-intermediate approach of MonetDB
+by deciding to keep a hold on them as long as deemed benificial.
-The approach taken is to mark the variables in MAL program,
-such that their result is retained in global recycle cache.
+The approach taken is to mark the variables in a MAL program,
+such that their result is retained in a global recycle cache.
Instructions become subject to the Recycler if
-at least one of its arguments is BAT and all others are
+at least one of its arguments is a BAT and all others are
either constants or variables already known in the Recycler.
Recycling currently starts with SQL bind instructions.
-Upon execution, the Recycler first check for
+Upon execution, the Recycler first checks for
an up to date result to be picked up at no cost.
-Otherwise. it evaluates the instruction and calls upon
+Otherwise, it evaluates the instruction and calls upon
policy functions to decide if it is worthwhile to
keep.
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