Tom Lane [Tue, 15 Feb 2011 01:59:42 +0000 (20:59 -0500)]
Rethink naming of contrib/intagg extension.
Initially it was called int_aggregate after the old SQL file, but since
the documentation just says "intagg" and that's also the directory name,
let's conform to that instead.
Simon Riggs [Tue, 15 Feb 2011 00:51:39 +0000 (00:51 +0000)]
PITR can stop at a named restore point when recovery target = time
though must not update the last transaction timestamp.
Plus comment and message cleanup for recent named restore point.
Tom Lane [Mon, 14 Feb 2011 21:07:00 +0000 (16:07 -0500)]
Rearrange extension-related views as per recent discussion.
The original design of pg_available_extensions did not consider the
possibility of version-specific control files. Split it into two views:
pg_available_extensions shows information that is generic about an
extension, while pg_available_extension_versions shows all available
versions together with information that could be version-dependent.
Also, add an SRF pg_extension_update_paths() to assist in checking that
a collection of update scripts provide sane update path sequences.
Tom Lane [Mon, 14 Feb 2011 03:53:00 +0000 (22:53 -0500)]
Assorted fixups for "unpackaged" conversion scripts.
From first pass of testing. Notably, there seems to be no need for
adminpack--unpackaged--1.0.sql because none of the objects that the
old module creates would ever be dumped by pg_dump anyway (they are
all in pg_catalog).
Tom Lane [Mon, 14 Feb 2011 02:24:14 +0000 (21:24 -0500)]
Avoid use of CREATE OR REPLACE FUNCTION in extension installation files.
It was never terribly consistent to use OR REPLACE (because of the lack of
comparable functionality for data types, operators, etc), and
experimentation shows that it's now positively pernicious in the extension
world. We really want a failure to occur if there are any conflicts, else
it's unclear what the extension-ownership state of the conflicted object
ought to be. Most of the time, CREATE EXTENSION will fail anyway because
of conflicts on other object types, but an extension defining only
functions can succeed, with bad results.
Tom Lane [Mon, 14 Feb 2011 01:06:41 +0000 (20:06 -0500)]
Convert contrib modules to use the extension facility.
This isn't fully tested as yet, in particular I'm not sure that the
"foo--unpackaged--1.0.sql" scripts are OK. But it's time to get some
buildfarm cycles on it.
sepgsql is not converted to an extension, mainly because it seems to
require a very nonstandard installation process.
Tom Lane [Sun, 13 Feb 2011 18:03:41 +0000 (13:03 -0500)]
Change the naming convention for extension files to use double dashes.
This allows us to have an unambiguous rule for deconstructing the names
of script files and secondary control files, without having to forbid
extension and version names from containing any dashes. We do have to
forbid them from containing double dashes or leading/trailing dashes,
but neither restriction is likely to bother anyone in practice.
Per discussion, this seems like a better solution overall than the
original design.
Tom Lane [Sat, 12 Feb 2011 21:40:41 +0000 (16:40 -0500)]
Refactor ALTER EXTENSION UPDATE to have cleaner multi-step semantics.
This change causes a multi-step update sequence to behave exactly as if the
updates had been commanded one at a time, including updating the "requires"
dependencies afresh at each step. The initial implementation took the
shortcut of examining only the final target version's "requires" and
changing the catalog entry but once. But on reflection that's a bad idea,
since it could lead to executing old update scripts under conditions
different than they were designed/tested for. Better to expend a few extra
cycles and avoid any surprises.
In the same spirit, if a CREATE EXTENSION FROM operation involves applying
a series of update files, it will act as though the CREATE had first been
done using the initial script's target version and then the additional
scripts were invoked with ALTER EXTENSION UPDATE.
I also removed the restriction about not changing encoding in secondary
control files. The new rule is that a script is assumed to be in whatever
encoding the control file(s) specify for its target version. Since this
reimplementation causes us to read each intermediate version's control
file, there's no longer any uncertainty about which encoding setting would
get applied.
Bruce Momjian [Sat, 12 Feb 2011 14:47:51 +0000 (09:47 -0500)]
Properly handle Win32 paths of 'E:abc', which can be either absolute or
relative, by creating a function path_is_relative_and_below_cwd() to
check for specific requirements. It is unclear if this fixes a security
problem or not but the new code is more robust.
Peter Eisentraut [Sat, 12 Feb 2011 13:54:13 +0000 (15:54 +0200)]
DDL support for collations
- collowner field
- CREATE COLLATION
- ALTER COLLATION
- DROP COLLATION
- COMMENT ON COLLATION
- integration with extensions
- pg_dump support for the above
- dependency management
- psql tab completion
- psql \dO command
Robert Haas [Sat, 12 Feb 2011 13:27:55 +0000 (08:27 -0500)]
Teach ALTER TABLE .. SET DATA TYPE to avoid some table rewrites.
When the old type is binary coercible to the new type and the using
clause does not change the column contents, we can avoid a full table
rewrite, though any indexes on the affected columns will still need
to be rebuilt. This applies, for example, when changing a varchar
column to be of type text.
The prior coding assumed that the set of operations that force a
rewrite is identical to the set of operations that must be propagated
to tables making use of the affected table's rowtype. This is
no longer true: even though the tuples in those tables wouldn't
need to be modified, the data type change invalidate indexes built
using those composite type columns. Indexes on the table we're
actually modifying can be invalidated too, of course, but the
existing machinery is sufficient to handle that case.
Along the way, add some debugging messages that make it possible
to understand what operations ALTER TABLE is actually performing
in these cases.
Tom Lane [Sat, 12 Feb 2011 03:53:43 +0000 (22:53 -0500)]
Clean up installation directory choices for extensions.
Arrange for the control files to be in $SHAREDIR/extension not
$SHAREDIR/contrib, since we're generally trying to deprecate the term
"contrib" and this is a once-in-many-moons opportunity to get rid of it in
install paths. Fix PGXS to install the $EXTENSION file into that directory
no matter what MODULEDIR is set to; a nondefault MODULEDIR should only
affect the script and secondary extension files. Fix the control file
directory parameter to be interpreted relative to $SHAREDIR, to avoid a
surprising disconnect between how you specify that and what you set
MODULEDIR to.
Tom Lane [Sat, 12 Feb 2011 02:25:20 +0000 (21:25 -0500)]
Add support for multiple versions of an extension and ALTER EXTENSION UPDATE.
This follows recent discussions, so it's quite a bit different from
Dimitri's original. There will probably be more changes once we get a bit
of experience with it, but let's get it in and start playing with it.
This is still just core code. I'll start converting contrib modules
shortly.
Robert Haas [Fri, 11 Feb 2011 13:47:38 +0000 (08:47 -0500)]
Tweak find_composite_type_dependencies API a bit more.
Per discussion with Noah Misch, the previous coding, introduced by
my commit 65377e0b9c0e0397b1598b38b6a7fb8b6f740d39 on 2011-02-06,
was really an abuse of RELKIND_COMPOSITE_TYPE, since the caller in
typecmds.c is actually passing the name of a domain. So go back
having a type name argument, but make the first argument a Relation
rather than just a string so we can tell whether it's a table or
a foreign table and emit the proper error message.
Send status updates back from standby server to master, indicating how far
the standby has written, flushed, and applied the WAL. At the moment, this
is for informational purposes only, the values are only shown in
pg_stat_replication system view, but in the future they will also be needed
for synchronous replication.
Extracted from Simon riggs' synchronous replication patch by Robert Haas, with
some tweaking by me.
Magnus Hagander [Thu, 10 Feb 2011 14:09:35 +0000 (15:09 +0100)]
Track last time for statistics reset on databases and bgwriter
Tracks one counter for each database, which is reset whenever
the statistics for any individual object inside the database is
reset, and one counter for the background writer.
Tom Lane [Thu, 10 Feb 2011 04:27:07 +0000 (23:27 -0500)]
Fix improper matching of resjunk column names for FOR UPDATE in subselect.
Flattening of subquery range tables during setrefs.c could lead to the
rangetable indexes in PlanRowMark nodes not matching up with the column
names previously assigned to the corresponding resjunk ctid (resp. tableoid
or wholerow) columns. Typical symptom would be either a "cannot extract
system attribute from virtual tuple" error or an Assert failure. This
wasn't a problem before 9.0 because we didn't support FOR UPDATE below the
top query level, and so the final flattening could never renumber an RTE
that was relevant to FOR UPDATE. Fix by using a plan-tree-wide unique
number for each PlanRowMark to label the associated resjunk columns, so
that the number need not change during flattening.
Per report from David Johnston (though I'm darned if I can see how this got
past initial testing of the relevant code). Back-patch to 9.0.
Tom Lane [Thu, 10 Feb 2011 00:17:33 +0000 (19:17 -0500)]
Fix pg_upgrade to handle extensions.
This follows my proposal of yesterday, namely that we try to recreate the
previous state of the extension exactly, instead of allowing CREATE
EXTENSION to run a SQL script that might create some entirely-incompatible
on-disk state. In --binary-upgrade mode, pg_dump won't issue CREATE
EXTENSION at all, but instead uses a kluge function provided by
pg_upgrade_support to recreate the pg_extension row (and extension-level
pg_depend entries) without creating any member objects. The member objects
are then restored in the same way as if they weren't members, in particular
using pg_upgrade's normal hacks to preserve OIDs that need to be preserved.
Then, for each member object, ALTER EXTENSION ADD is issued to recreate the
pg_depend entry that marks it as an extension member.
In passing, fix breakage in pg_upgrade's enum-type support: somebody didn't
fix it when the noise word VALUE got added to ALTER TYPE ADD. Also,
rationalize parsetree representation of COMMENT ON DOMAIN and fix
get_object_address() to allow OBJECT_DOMAIN.
Tom Lane [Wed, 9 Feb 2011 19:05:34 +0000 (14:05 -0500)]
Rethink order of operations for dumping extension member objects.
My original idea of doing extension member identification during
getDependencies() didn't work correctly: we have to mark member tables as
not-to-be-dumped rather earlier than that, else their subsidiary objects
like indexes get dumped anyway. Rearrange code to mark them early enough.
Tom Lane [Wed, 9 Feb 2011 16:55:32 +0000 (11:55 -0500)]
Implement "ALTER EXTENSION ADD object".
This is an essential component of making the extension feature usable;
first because it's needed in the process of converting an existing
installation containing "loose" objects of an old contrib module into
the extension-based world, and second because we'll have to use it
in pg_dump --binary-upgrade, as per recent discussion.
Loosely based on part of Dimitri Fontaine's ALTER EXTENSION UPGRADE
patch.
Fix allocation of RW-conflict pool in the new predicate lock manager, and
also take the RW-conflict pool into account in the PredicateLockShmemSize()
estimate.
Magnus Hagander [Wed, 9 Feb 2011 09:59:53 +0000 (10:59 +0100)]
Implement NOWAIT option for BASE_BACKUP command
Specifying this option makes the server not wait for the
xlog to be archived, or emit a warning that it can't,
instead leaving the responsibility with the client.
This is useful when the log is being streamed using
the streaming protocol in parallel with the backup,
without having log archiving enabled.
Tom Lane [Tue, 8 Feb 2011 23:12:17 +0000 (18:12 -0500)]
Suppress some compiler warnings in recent commits.
Older versions of gcc tend to throw "variable might be clobbered by
`longjmp' or `vfork'" warnings whenever a variable is assigned in more than
one place and then used after the end of a PG_TRY block. That's reasonably
easy to work around in execute_extension_script, and the overhead of
unconditionally saving/restoring the GUC variables seems unlikely to be a
serious concern.
Also clean up logic in ATExecValidateConstraint to make it easier to read
and less likely to provoke "variable might be used uninitialized in this
function" warnings.
Tom Lane [Tue, 8 Feb 2011 21:08:41 +0000 (16:08 -0500)]
Core support for "extensions", which are packages of SQL objects.
This patch adds the server infrastructure to support extensions.
There is still one significant loose end, namely how to make it play nice
with pg_upgrade, so I am not yet committing the changes that would make
all the contrib modules depend on this feature.
In passing, fix a disturbingly large amount of breakage in
AlterObjectNamespace() and callers.
Dimitri Fontaine, reviewed by Anssi Kääriäinen,
Itagaki Takahiro, Tom Lane, and numerous others
Simon Riggs [Tue, 8 Feb 2011 19:39:08 +0000 (19:39 +0000)]
Named restore points in recovery. Users can record named points, then
new recovery.conf parameter recovery_target_name allows PITR to
specify named points as recovery targets.
Jaime Casanova, reviewed by Euler Taveira de Oliveira, plus minor edits
Simon Riggs [Tue, 8 Feb 2011 18:30:22 +0000 (18:30 +0000)]
Basic Recovery Control functions for use in Hot Standby. Pause, Resume,
Status check functions only. Also, new recovery.conf parameter to
pause_at_recovery_target, default on.
Simon Riggs [Tue, 8 Feb 2011 14:38:02 +0000 (14:38 +0000)]
Remove rare corner case for data loss when triggering standby server.
If the standby was streaming when trigger file arrives, check also in the
archive for additional WAL files. This is a corner case since it is
unlikely that we would trigger a failover while the master is still
available and sending data to standby, while at the same time running in
archive mode and also while the streaming standby has fallen behind archive.
Someone would eventually be unlucky; we must plug all gaps however small.
Simon Riggs [Tue, 8 Feb 2011 12:23:20 +0000 (12:23 +0000)]
Extend ALTER TABLE to allow Foreign Keys to be added without initial validation.
FK constraints that are marked NOT VALID may later be VALIDATED, which uses an
ShareUpdateExclusiveLock on constraint table and RowShareLock on referenced
table. Significantly reduces lock strength and duration when adding FKs.
New state visible from psql.
Simon Riggs, with reviews from Marko Tiikkaja and Robert Haas
Robert Haas [Tue, 8 Feb 2011 03:04:29 +0000 (22:04 -0500)]
Avoid having autovacuum workers wait for relation locks.
Waiting for relation locks can lead to starvation - it pins down an
autovacuum worker for as long as the lock is held. But if we're doing
an anti-wraparound vacuum, then we still wait; maintenance can no longer
be put off.
To assist with troubleshooting, if log_autovacuum_min_duration >= 0,
we log whenever an autovacuum or autoanalyze is skipped for this reason.
Per a gripe by Josh Berkus, and ensuing discussion.
Until now, our Serializable mode has in fact been what's called Snapshot
Isolation, which allows some anomalies that could not occur in any
serialized ordering of the transactions. This patch fixes that using a
method called Serializable Snapshot Isolation, based on research papers by
Michael J. Cahill (see README-SSI for full references). In Serializable
Snapshot Isolation, transactions run like they do in Snapshot Isolation,
but a predicate lock manager observes the reads and writes performed and
aborts transactions if it detects that an anomaly might occur. This method
produces some false positives, ie. it sometimes aborts transactions even
though there is no anomaly.
To track reads we implement predicate locking, see storage/lmgr/predicate.c.
Whenever a tuple is read, a predicate lock is acquired on the tuple. Shared
memory is finite, so when a transaction takes many tuple-level locks on a
page, the locks are promoted to a single page-level lock, and further to a
single relation level lock if necessary. To lock key values with no matching
tuple, a sequential scan always takes a relation-level lock, and an index
scan acquires a page-level lock that covers the search key, whether or not
there are any matching keys at the moment.
A predicate lock doesn't conflict with any regular locks or with another
predicate locks in the normal sense. They're only used by the predicate lock
manager to detect the danger of anomalies. Only serializable transactions
participate in predicate locking, so there should be no extra overhead for
for other transactions.
Predicate locks can't be released at commit, but must be remembered until
all the transactions that overlapped with it have completed. That means that
we need to remember an unbounded amount of predicate locks, so we apply a
lossy but conservative method of tracking locks for committed transactions.
If we run short of shared memory, we overflow to a new "pg_serial" SLRU
pool.
We don't currently allow Serializable transactions in Hot Standby mode.
That would be hard, because even read-only transactions can cause anomalies
that wouldn't otherwise occur.
Serializable isolation mode now means the new fully serializable level.
Repeatable Read gives you the old Snapshot Isolation level that we have
always had.
Kevin Grittner and Dan Ports, reviewed by Jeff Davis, Heikki Linnakangas and
Anssi Kääriäinen
Andrew Dunstan [Sun, 6 Feb 2011 22:29:26 +0000 (17:29 -0500)]
Force strings passed to and from plperl to be in UTF8 encoding.
String are converted to UTF8 on the way into perl and to the
database encoding on the way back. This avoids a number of
observed anomalies, and ensures Perl a consistent view of the
world.
Bruce Momjian [Sun, 6 Feb 2011 15:46:15 +0000 (10:46 -0500)]
Rename macro DECIMAL to DECIMAL_T to help pgindent; this is already
done for a few other macros in that file, for other reasons. I also
remove pgindent/README mention of the file.
Robert Haas [Sun, 6 Feb 2011 05:26:27 +0000 (00:26 -0500)]
Tighten ALTER FOREIGN TABLE .. SET DATA TYPE checks.
If the foreign table's rowtype is being used as the type of a column in
another table, we can't just up and change its data type. This was
already checked for composite types and ordinary tables, but we
previously failed to enforce it for foreign tables.
Robert Haas [Fri, 4 Feb 2011 21:14:54 +0000 (16:14 -0500)]
Clarify comment in ATRewriteTable().
Make sure it's clear that the prohibition on adding a column with a default
when the rowtype is used elsewhere is intentional, and be a bit more
explicit about the other cases where we perform this check.
Robert Haas [Fri, 4 Feb 2011 14:28:06 +0000 (09:28 -0500)]
Make handling of errcodes.h more consistent with other generated headers.
This fixes make distprep, and seems more robust in other ways as well.
Some special handling is required because errcodes.txt is needed by
some stuff in src/port, but just by src/backend as is the case for the
other generated headers.
While I'm at it, fix a few other things that were overlooked in the
original patch.
Robert Haas [Fri, 4 Feb 2011 03:32:49 +0000 (22:32 -0500)]
Avoid maintaining three separate copies of the error codes list.
src/pl/plpgsql/src/plerrcodes.h, src/include/utils/errcodes.h, and a
big chunk of errcodes.sgml are now automatically generated from a single
file, src/backend/utils/errcodes.txt.