< Last updated: Sat May 5 10:47:39 EDT 2007
> Last updated: Sat May 5 11:39:57 EDT 2007
< * Flush cached query plans when the dependent objects change,
< when the cardinality of parameters changes dramatically, or
> * -Flush cached query plans when the dependent objects change or
<
< A more complex solution would be to save multiple plans for different
< cardinality and use the appropriate plan based on the EXECUTE values.
<
< * Track dependencies in function bodies and recompile/invalidate
<
< This is particularly important for references to temporary tables
< in PL/PgSQL because PL/PgSQL caches query plans. The only workaround
< in PL/PgSQL is to use EXECUTE. One complexity is that a function
< might itself drop and recreate dependent tables, causing it to
< invalidate its own query plan.
<
< * Invalidate prepared queries, like INSERT, when the table definition
> * -Track dependencies in function bodies and recompile/invalidate
> * -Invalidate prepared queries, like INSERT, when the table definition
< * Invalidate prepared queries, like INSERT, when the table definition
< is altered
>
> * Invalidate prepared queries, like INSERT, when the table definition
> is altered
> * -Allow ORDER BY ... LIMIT # to select high/low value without sort or
<
< Right now, if no index exists, ORDER BY ... LIMIT # requires we sort
< all values to return the high/low value. Instead The idea is to do a
< sequential scan to find the high/low value, thus avoiding the sort.
< MIN/MAX already does this, but not for LIMIT > 1.
<
< o Add support for MOVE and SCROLL cursors
<
< PL/pgSQL cursors should support the same syntax as
< backend cursors.
<
> o -Add support for MOVE cursors
> o Add support for SCROLL cursors
RESET SESSION, RESET PLANS, and RESET TEMP are now DISCARD ALL,
DISCARD PLANS, and DISCARD TEMP, respectively. This is to avoid
confusion with the pre-existing RESET variants: the DISCARD
commands are not actually similar to RESET. Patch from Marko
Kreen, with some minor editorialization.
This is needed to allow a security-definer function to set a truly secure
value of search_path. Without it, a malicious user can use temporary objects
to execute code with the privileges of the security-definer function. Even
pushing the temp schema to the back of the search path is not quite good
enough, because a function or operator at the back of the path might still
capture control from one nearer the front due to having a more exact datatype
match. Hence, disable searching the temp schema altogether for functions and
operators.
Security: CVE-2007-2138
< Currently all schemas are owned by the super-user because they are
< copied from the template1 database.
> Currently all schemas are owned by the super-user because they are copied
> from the template1 database. However, since all objects are inherited
> from the template database, it is not clear that setting schemas to the db
> owner is correct.
processes to be running simultaneously. Also, now autovacuum processes do not
count towards the max_connections limit; they are counted separately from
regular processes, and are limited by the new GUC variable
autovacuum_max_workers.
The launcher now has intelligence to launch workers on each database every
autovacuum_naptime seconds, limited only on the max amount of worker slots
available.
Also, the global worker I/O utilization is limited by the vacuum cost-based
delay feature. Workers are "balanced" so that the total I/O consumption does
not exceed the established limit. This part of the patch was contributed by
ITAGAKI Takahiro.
Per discussion.
