[Zope-Checkins] CVS: Zope2 - CHANGES.txt:1.287.2.89

[Jim Fulton]

Update of /cvs-repository/Zope2/doc
In directory korak:/tmp/cvs-serv29291

Modified Files:
      Tag: zope-2_3-branch
	CHANGES.txt 
Log Message:
Added BTree/Cataloh changes.



--- Updated File CHANGES.txt in package Zope2 --
--- CHANGES.txt	2001/03/12 21:27:27	1.287.2.88
+++ CHANGES.txt	2001/03/15 13:50:45	1.287.2.89
@@ -105,6 +105,37 @@
           security assertions, which meant that it could not be accessed
           from DTML as advertised.
 
+        - Key errors were returned from catalog searches due to bugs
+          in unindexing objects.
+
+        - Objects that should have been included in search results
+          were excluded do to bugs in indexing objects.
+
+        - The database grew too fast when objects were routinely
+          indexed one at a time by the catalog. This was due to
+          inefficiencies in the underlying BTree implementation that
+          caused too many objects to be changed when indexing
+          incrementally. In addition, the set implementation, used for
+          keeping track of documents in field indexes, when the number
+          of documents per key was large, caused large database updates
+          when a document was added or removed, because the entire set
+          was stored in a single database record.
+
+          A new BTree and set implementation has been
+          provided to address these problems.
+
+        - The catalog is the most common source of conflict errors due
+          to a number of "hot spots" in the implementation and due to
+          the large number of objects that are typically updated when
+          indexing.  The hot spots have now been removed and the
+          number of objects modified when indexing has been
+          dramatically reduced. In addition, conflicts detected during
+          transaction commit can not usually be resolved using new
+          conflict-resolution protocols and conflict-resolution
+          support added to the catalog. These changes will not avoid
+          all conflicts, but will reduce conflicts significantly in
+          many cases.
+
     Zope 2.3.1 beta 1
 
       Bugs Fixed