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New GUC from commit fc34b0d9.
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Commit 40d964ec99 allowed vacuum command to process indexes in parallel but
forgot to accumulate the buffer usage stats of parallel workers. This
allows leader backend to accumulate buffer usage stats of all the parallel
workers.
Reported-by: Julien Rouhaud
Author: Sawada Masahiko
Reviewed-by: Dilip Kumar, Amit Kapila and Julien Rouhaud
Discussion: https://postgr.es/m/20200328151721.GB12854@nol
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This commit makes pg_stat_statements support new GUC
pg_stat_statements.track_planning. If this option is enabled,
pg_stat_statements tracks the planning statistics of the statements,
e.g., the number of times the statement was planned, the total time
spent planning the statement, etc. This feature is useful to check
the statements that it takes a long time to plan. Previously since
pg_stat_statements tracked only the execution statistics, we could
not use that for the purpose.
The planning and execution statistics are stored at the end of
each phase separately. So there are not always one-to-one relationship
between them. For example, if the statement is successfully planned
but fails in the execution phase, only its planning statistics are stored.
This may cause the users to be able to see different pg_stat_statements
results from the previous version. To avoid this,
pg_stat_statements.track_planning needs to be disabled.
This commit bumps the version of pg_stat_statements to 1.8
since it changes the definition of pg_stat_statements function.
Author: Julien Rouhaud, Pascal Legrand, Thomas Munro, Fujii Masao
Reviewed-by: Sergei Kornilov, Tomas Vondra, Yoshikazu Imai, Haribabu Kommi, Tom Lane
Discussion: https://postgr.es/m/CAHGQGwFx_=DO-Gu-MfPW3VQ4qC7TfVdH2zHmvZfrGv6fQ3D-Tw@mail.gmail.com
Discussion: https://postgr.es/m/CAEepm=0e59Y_6Q_YXYCTHZkqOc6H2pJ54C_Xe=VFu50Aqqp_sA@mail.gmail.com
Discussion: https://postgr.es/m/DB6PR0301MB21352F6210E3B11934B0DCC790B00@DB6PR0301MB2135.eurprd03.prod.outlook.com
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There's a number of SLRU caches used to access important data like clog,
commit timestamps, multixact, asynchronous notifications, etc. Until now
we had no easy way to monitor these shared caches, compute hit ratios,
number of reads/writes etc.
This commit extends the statistics collector to track this information
for a predefined list of SLRUs, and also introduces a new system view
pg_stat_slru displaying the data.
The list of built-in SLRUs is fixed, but additional SLRUs may be defined
in extensions. Unfortunately, there's no suitable registry of SLRUs, so
this patch simply defines a fixed list of SLRUs with entries for the
built-in ones and one entry for all additional SLRUs. Extensions adding
their own SLRU are fairly rare, so this seems acceptable.
This patch only allows monitoring of SLRUs, not tuning. The SLRU sizes
are still fixed (hard-coded in the code) and it's not entirely clear
which of the SLRUs might need a GUC to tune size. In a way, allowing us
to determine that is one of the goals of this patch.
Bump catversion as the patch introduces new functions and system view.
Author: Tomas Vondra
Reviewed-by: Alvaro Herrera
Discussion: https://www.postgresql.org/message-id/flat/20200119143707.gyinppnigokesjok@development
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We require the partition key to be a subset of the set of columns
being made unique, so that physically-separate indexes on the different
partitions are sufficient to enforce the uniqueness constraint.
The existing code checked that the listed columns appear, but did not
inquire into the index semantics, which is a serious oversight given
that different index opclasses might enforce completely different
notions of uniqueness.
Ideally, perhaps, we'd just match the partition key opfamily to the
index opfamily. But hash partitioning uses hash opfamilies which we
can't directly match to btree opfamilies. Hence, look up the equality
operator in each family, and accept if it's the same operator. This
should be okay in a fairly general sense, since the equality operator
ought to precisely represent the opfamily's notion of uniqueness.
A remaining weak spot is that we don't have a cross-index-AM notion of
which opfamily member is "equality". But we know which one to use for
hash and btree AMs, and those are the only two that are relevant here
at present. (Any non-core AMs that know how to enforce equality are
out of luck, for now.)
Back-patch to v11 where this feature was introduced.
Guancheng Luo, revised a bit by me
Discussion: https://postgr.es/m/D9C3CEF7-04E8-47A1-8300-CA1DCD5ED40D@gmail.com
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Quite a few matching operators such as JSONB's @> used "contsel" and
"contjoinsel" as their selectivity estimators. That was a bad idea,
because (a) contsel is only a stub, yielding a fixed default estimate,
and (b) that default is 0.001, meaning we estimate these operators as
five times more selective than equality, which is surely pretty silly.
There's a good model for improving this in ltree's ltreeparentsel():
for any "var OP constant" query, we can try applying the operator
to all of the column's MCV and histogram values, taking the latter
as being a random sample of the non-MCV values. That code is
actually 100% generic, except for the question of exactly what
default selectivity ought to be plugged in when we don't have stats.
Hence, migrate the guts of ltreeparentsel() into the core code, provide
wrappers "matchingsel" and "matchingjoinsel" with a more-appropriate
default estimate, and use those for the non-geometric operators that
formerly used contsel (mostly JSONB containment operators and tsquery
matching).
Also apply this code to some match-like operators in hstore, ltree, and
pg_trgm, including the former users of ltreeparentsel as well as ones
that improperly used contsel. Since commit 911e70207 just created new
versions of those extensions that we haven't released yet, we can sneak
this change into those new versions instead of having to create an
additional generation of update scripts.
Patch by me, reviewed by Alexey Bashtanov
Discussion: https://postgr.es/m/12237.1582833074@sss.pgh.pa.us
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This unifies some duplicate code.
Author: Amit Langote <amitlangote09@gmail.com>
Discussion: https://www.postgresql.org/message-id/CA+HiwqFjYE5anArxvkjr37AQMd52L-LZtz9Ld2QrLQ3YfcYhTw@mail.gmail.com
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In a psql session, if the connection to the server is abruptly cut, the
referenced connection would become NULL as of CheckConnection(). This
could cause a hard crash with psql if attempting to connect by reusing
the past connection's data because of a null-pointer dereference with
either PQhost() or PQdb(). This issue is fixed by making sure that no
reuse of the past connection is done if it does not exist.
Issue has been introduced by 6e5f8d4, so backpatch down to 12.
Reported-by: Hugh Wang
Author: Michael Paquier
Reviewed-by: Álvaro Herrera, Tom Lane
Discussion: https://postgr.es/m/16330-b34835d83619e25d@postgresql.org
Backpatch-through: 12
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The coverity complained that dividing integer expressions and then
converting the integer quotient to type "double" would lose fractional
part. Typecasting one of the arguments of expression with double should
fix the report.
Author: Mahendra Singh Thalor
Reviewed-by: Amit Kapila
Discussion: https://postgr.es/m/20200329224818.6phnhv7o2q2rfovf@alap3.anarazel.de
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This was missed when the feature was added.
Reported-by: Vik Fearing
Discussion: https://postgr.es/m/eca20529-0b06-b493-ee38-f071a75dcd5b@postgresfriends.org
Backpatch-through: 10
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pg_rewind needs to copy from the source cluster to the target cluster a
set of relation blocks changed from the previous checkpoint where WAL
forked up to the end of WAL on the target. Building this list of
relation blocks requires a range of WAL segments that may not be present
anymore on the target's pg_wal, causing pg_rewind to fail. It is
possible to work around this issue by copying manually the WAL segments
needed but this may lead to some extra and actually useless work.
This commit introduces a new option allowing pg_rewind to use a
restore_command while doing the rewind by grabbing the parameter value
of restore_command from the target cluster configuration. This allows
the rewind operation to be more reliable, so as only the WAL segments
needed by the rewind are restored from the archives.
In order to be able to do that, a new routine is added to src/common/ to
allow frontend tools to restore files from archives using an
already-built restore command. This version is more simple than the
backend equivalent as there is no need to handle the non-recovery case.
Author: Alexey Kondratov
Reviewed-by: Andrey Borodin, Andres Freund, Alvaro Herrera, Alexander
Korotkov, Michael Paquier
Discussion: https://postgr.es/m/a3acff50-5a0d-9a2c-b3b2-ee36168955c1@postgrespro.ru
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Add two assertions that verify the assumptions about posting list tuple
space accounting and suffix truncation made within nbtsort.c.
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Must hold some lock on the pg_statistic_ext_data catalog *before*
we look up the tuple we aim to replace. Otherwise a concurrent
VACUUM FULL or similar operation could move it to a different TID,
leaving us trying to replace the wrong tuple.
Back-patch to v12 where this got broken.
Credit goes to Dean Rasheed; I'm just doing the clerical work.
Discussion: https://postgr.es/m/CAEZATCU0zHMDiQV0g8P2U+YSP9C1idUPrn79DajsbonwkN0xvQ@mail.gmail.com
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The stats_ext test is not expecting that autovacuum will touch
any of its tables; an expectation falsified by commit b07642dbc.
Although I'm suspicious that there's something else going on that
makes extended stats estimates not 100% reproducible, it's pretty
easy to demonstrate that there are places in this test that fail
if an autovacuum updates the table's stats unexpectedly.
Hence, revert the band-aid changes made by 2dc16efed and 24566b359
in favor of summarily disabling autovacuum for all the tables that
this test checks estimated rowcounts for.
Also remove an evidently obsolete comment at the head of the test.
Discussion: https://postgr.es/m/15012.1585623298@sss.pgh.pa.us
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When recovery target is reached and recovery is paused because of
recovery_target_action=pause, executing pg_wal_replay_resume() causes
the standby to promote, i.e., the recovery to end. So, in this case,
the previous message "Execute pg_wal_replay_resume() to continue"
logged was confusing because pg_wal_replay_resume() doesn't cause
the recovery to continue.
This commit improves the message logged when recovery is paused,
and the proper message is output based on what (pg_wal_replay_pause
or recovery_target_action) causes recovery to be paused.
Author: Sergei Kornilov, revised by Fujii Masao
Reviewed-by: Robert Haas
Discussion: https://postgr.es/m/19168211580382043@myt5-b646bde4b8f3.qloud-c.yandex.net
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This change defines SHLIB_PREREQS for the libpgport dependency, rather
than using a makefile rule. This was broken in PG 12.
Reported-by: Filip Janus
Discussion: https://postgr.es/m/E5Dc85EGUY4wyG8cjAU0qoEdCJxGK_qhW1s9qSuYq9A@mail.gmail.com
Author: Dagfinn Ilmari Mannsåker (for libpq)
Backpatch-through: 12
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Buildfarm experience shows that this function can fail with ENOENT
if some other process unlinks a file between when we read the directory
entry and when we try to stat() it. The problem is old but we had
not noticed it until 085b6b667 added regression test coverage.
To fix, just ignore ENOENT failures. There is one other case that
this might hide: a symlink that points to nowhere. That seems okay
though, at least better than erroring.
Back-patch to v10 where this function was added, since the regression
test cases were too.
Discussion: https://postgr.es/m/20200308173103.GC1357@telsasoft.com
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This commit improves error reporting introduced by 911e702077. It puts
argument of errmsg() to the single line for easier grepping source for error
text. Also it improves wording of errhint().
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Author: Daniel Gustafsson <daniel@yesql.se>
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The original implementation disallowed using OVERRIDING USER VALUE on
identity columns defined as GENERATED ALWAYS, which is not per
standard. So allow that now.
Expand documentation and tests around this.
Author: Dean Rasheed <dean.a.rasheed@gmail.com>
Reviewed-by: Peter Eisentraut <peter.eisentraut@2ndquadrant.com>
Reviewed-by: Vik Fearing <vik@postgresfriends.org>
Discussion: https://www.postgresql.org/message-id/flat/CAEZATCVrh2ufCwmzzM%3Dk_OfuLhTTPBJCdFkimst2kry4oHepuQ%40mail.gmail.com
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The definitions of the routines defined in xlogarchive.c have been part
of xlog_internal.h which is included by several frontend tools, but all
those routines are only called by the backend. More cleanup could be
done within xlog_internal.h, but that's already a nice cut.
This will help a follow-up patch for pg_rewind where handling of
restore_command is added for frontends.
Author: Alexey Kondratov, Michael Paquier
Reviewed-by: Álvaro Herrera, Alexander Korotkov
Discussion: https://postgr.es/m/a3acff50-5a0d-9a2c-b3b2-ee36168955c1@postgrespro.ru
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Set T653 to supported. This has always been possible.
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vacuum code.
After commit b61d161c14, during vacuum, we cache the information of
relation name and relation namespace in local structure LVRelStats so that
we can use it in an error callback function. We can use the cached
information to avoid the calls to RelationGetRelationName(),
RelationGetNamespace() and get_namespace_name(). This is mainly for the
consistent in vacuum code path but it will avoid the extra syscache lookup
we do in get_namespace_name().
Author: Justin Pryzby
Reviewed-by: Amit Kapila
Discussion: https://www.postgresql.org/message-id/20191120210600.GC30362@telsasoft.com
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Commit 7c2dbc69 reorganized _bt_truncate() in a way that enables a
further simplification that I (pgeoghegan) missed: Since we mark the
tuple that is returned to the caller as a pivot tuple before the point
where its heap TID is set as of 7c2dbc69, it is possible to use the high
level BTreeTupleGetHeapTID() inline function to get an item pointer. Do
it that way now. This approach is clearer and more maintainable.
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This reverts commit 2aa6e33, that added a fast path to skip
anti-wraparound and non-aggressive autovacuum jobs (these have no sense
as anti-wraparound implies aggressive). With a cluster using a high
amount of relations with a portion of them being heavily updated, this
could cause autovacuum to lock down, with autovacuum workers attempting
repeatedly those jobs on the same relations for the same database, that
just kept being skipped. This lock down can be solved with a manual
VACUUM FREEZE.
Justin King has reported one environment where the issue happened, and
Julien Rouhaud and I have been able to reproduce it in a second
environment. With a very aggressive autovacuum_freeze_max_age,
triggering those jobs with pgbench is a matter of minutes, and hitting
the lock down is a lot harder (my local tests failed to do that).
Note that anti-wraparound and non-aggressive jobs can only be triggered
on a subset of shared catalogs:
- pg_auth_members
- pg_authid
- pg_database
- pg_replication_origin
- pg_shseclabel
- pg_subscription
- pg_tablespace
While the lock down was possible down to v12, the root cause of those
jobs is a much older issue, which needs more analysis.
Bonus thanks to Andres Freund for the discussion.
Reported-by: Justin King
Discussion: https://postgr.es/m/CAE39h22zPLrkH17GrkDgAYL3kbjvySYD1io+rtnAUFnaJJVS4g@mail.gmail.com
Backpatch-through: 12
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Simplify _bt_truncate(), the routine that generates truncated leaf page
high keys. Remove a micro-optimization that avoided a second palloc0()
call (this was used when a heap TID was needed in the final pivot tuple,
though only when the index happened to not be an INCLUDE index).
Removing this dubious micro-optimization allows _bt_truncate() to use
the index_truncate_tuple() indextuple.c utility routine in all cases.
This was already the common case.
This commit is a HEAD-only follow up to bugfix commit 4b42a899.
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The recheck isn't needed anymore, as RelationGetBufferForTuple() now
extends the relation with RBM_ZERO_AND_LOCK. Previously we needed to
handle the fact that relation extension extended the relation and then
separately acquired a lock on the page - while expecting that the page
is empty.
Reported-By: Ranier Vilela
Discussion: https://postgr.es/m/CAEudQArA_=J0D5T258xsCY6Xtf6wiH4b=QDPDgVS+WZUN10WDw@mail.gmail.com
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911e702077 misses setting of amoptsprocnum for SP-GiST. This commit fixes
that.
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Early versions of opclass options patch uses zero support procedure as opclass
options procedure. This commit removes rudiments of it, which were committed
in 911e702077. Also, it implements correct handling of amoptsprocnum == 0.
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INCLUDE indexes failed to have their non-key attributes physically
truncated away in certain rare cases. This led to physically larger
pivot tuples that contained useless non-key attribute values. The
impact on users should be negligible, but this is still clearly a
regression (Postgres 11 supports INCLUDE indexes, and yet was not
affected).
The bug appeared in commit dd299df8, which introduced "true" suffix
truncation of key attributes.
Discussion: https://postgr.es/m/CAH2-Wz=E8pkV9ivRSFHtv812H5ckf8s1-yhx61_WrJbKccGcrQ@mail.gmail.com
Backpatch: 12-, where "true" suffix truncation was introduced.
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PostgreSQL provides set of template index access methods, where opclasses have
much freedom in the semantics of indexing. These index AMs are GiST, GIN,
SP-GiST and BRIN. There opclasses define representation of keys, operations on
them and supported search strategies. So, it's natural that opclasses may be
faced some tradeoffs, which require user-side decision. This commit implements
opclass parameters allowing users to set some values, which tell opclass how to
index the particular dataset.
This commit doesn't introduce new storage in system catalog. Instead it uses
pg_attribute.attoptions, which is used for table column storage options but
unused for index attributes.
In order to evade changing signature of each opclass support function, we
implement unified way to pass options to opclass support functions. Options
are set to fn_expr as the constant bytea expression. It's possible due to the
fact that opclass support functions are executed outside of expressions, so
fn_expr is unused for them.
This commit comes with some examples of opclass options usage. We parametrize
signature length in GiST. That applies to multiple opclasses: tsvector_ops,
gist__intbig_ops, gist_ltree_ops, gist__ltree_ops, gist_trgm_ops and
gist_hstore_ops. Also we parametrize maximum number of integer ranges for
gist__int_ops. However, the main future usage of this feature is expected
to be json, where users would be able to specify which way to index particular
json parts.
Catversion is bumped.
Discussion: https://postgr.es/m/d22c3a18-31c7-1879-fc11-4c1ce2f5e5af%40postgrespro.ru
Author: Nikita Glukhov, revised by me
Reviwed-by: Nikolay Shaplov, Robert Haas, Tom Lane, Tomas Vondra, Alvaro Herrera
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The test suites currently don't use Unix-domain sockets on Windows.
This optionally allows enabling that by setting the environment
variable PG_TEST_USE_UNIX_SOCKETS.
This should currently be considered experimental. In particular,
pg_regress.c contains some comments that the cleanup code for
Unix-domain sockets doesn't work correctly under Windows, which hasn't
been an problem until now. But it's good enough for locally
supervised testing of the functionality.
Reviewed-by: Andrew Dunstan <andrew.dunstan@2ndquadrant.com>
Discussion: https://www.postgresql.org/message-id/flat/54bde68c-d134-4eb8-5bd3-8af33b72a010@2ndquadrant.com
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GetLocaleInfoEx() can fail on strings that setlocale() was perfectly
happy with. A common way for that to happen is if the locale string
is actually a Unix-style string, say "et_EE.UTF-8". In that case,
what's after the dot is an encoding name, not a Windows codepage number;
blindly treating it as a codepage number led to failure, with a fairly
silly error message. Hence, check to see if what's after the dot is
all digits, and if not, treat it as a literal encoding name rather than
a codepage number. This will do the right thing with many Unix-style
locale strings, and produce a more sensible error message otherwise.
Somewhat independently of that, treat a zero (CP_ACP) result from
GetLocaleInfoEx() as meaning that we must use UTF-8 encoding.
Back-patch to all supported branches.
Juan José Santamaría Flecha
Discussion: https://postgr.es/m/24905.1585445371@sss.pgh.pa.us
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Following up on 2dc16efed, petalura has suffered some additional
failures in stats_ext which again appear to be around the timing of an
autovacuum during the test, causing instability in the row estimates.
Again, let's fix this by explicitly performing a VACUUM on the table
and not leave it to happen by chance of an autovacuum pass.
Discussion: https://postgr.es/m/CAApHDvok5hmXr%2BbUbJe7%2B2sQzWo4B_QzSk7RKFR9fP6BjYXx5g%40mail.gmail.com
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Previously while the startup process was waiting for the recovery conflict
with snapshot, tablespace or lock to be resolved, waiting was reported in
PS display, but not in the case of recovery conflict with buffer pin.
This commit makes the startup process in hot standby report waiting via PS
while waiting for the conflicts with other backends holding buffer pins to
be resolved.
Author: Masahiko Sawada
Reviewed-by: Fujii Masao
Discussion: https://postgr.es/m/CA+fd4k4mXWTwfQLS3RPwGr4xnfAEs1ysFfgYHvmmoUgv6Zxvmg@mail.gmail.com
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When certain parameters are changed on a physical replication primary,
this is communicated to standbys using the XLOG_PARAMETER_CHANGE WAL
record. The standby then checks whether its own settings are at least
as big as the ones on the primary. If not, the standby shuts down
with a fatal error.
The correspondence of settings between primary and standby is required
because those settings influence certain shared memory sizings that
are required for processing WAL records that the primary might send.
For example, if the primary sends a prepared transaction, the standby
must have had max_prepared_transaction set appropriately or it won't
be able to process those WAL records.
However, fatally shutting down the standby immediately upon receipt of
the parameter change record might be a bit of an overreaction. The
resources related to those settings are not required immediately at
that point, and might never be required if the activity on the primary
does not exhaust all those resources. If we just let the standby roll
on with recovery, it will eventually produce an appropriate error when
those resources are used.
So this patch relaxes this a bit. Upon receipt of
XLOG_PARAMETER_CHANGE, we still check the settings but only issue a
warning and set a global flag if there is a problem. Then when we
actually hit the resource issue and the flag was set, we issue another
warning message with relevant information. At that point we pause
recovery, so a hot standby remains usable. We also repeat the last
warning message once a minute so it is harder to miss or ignore.
Reviewed-by: Sergei Kornilov <sk@zsrv.org>
Reviewed-by: Masahiko Sawada <masahiko.sawada@2ndquadrant.com>
Reviewed-by: Kyotaro Horiguchi <horikyota.ntt@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/4ad69a4c-cc9b-0dfe-0352-8b1b0cd36c7b@2ndquadrant.com
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This commit adds query_string argument into the planner-related functions
and hook and allows us to pass the query string to them.
Currently there is no user of the query string passed. But the upcoming patch
for the planning counters will add the planning hook function into
pg_stat_statements and the function will need the query string. So this change
will be necessary for that patch.
Also this change is useful for some extensions that want to use the query
string in their planner hook function.
Author: Pascal Legrand, Julien Rouhaud
Reviewed-by: Yoshikazu Imai, Tom Lane, Fujii Masao
Discussion: https://postgr.es/m/CAOBaU_bU1m3_XF5qKYtSj1ua4dxd=FWDyh2SH4rSJAUUfsGmAQ@mail.gmail.com
Discussion: https://postgr.es/m/1583789487074-0.post@n3.nabble.com
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Previously pg_stat_statements calculated the difference of buffer counters
by its own code even while BufferUsageAccumDiff() had the same code.
This commit expose BufferUsageAccumDiff() and makes pg_stat_statements
use it for the calculation, in order to simply the code.
This change also would be useful for the upcoming patch for the planning
counters in pg_stat_statements because the patch will add one more code
for the calculation of difference of buffer counters and that can easily be
done by using BufferUsageAccumDiff().
Author: Julien Rouhaud
Reviewed-by: Fujii Masao
Discussion: https://postgr.es/m/bdfee4e0-a304-2498-8da5-3cb52c0a193e@oss.nttdata.com
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The additional information displayed will be block number for error
occurring while processing heap and index name for error occurring
while processing the index.
This will help us in diagnosing the problems that occur during a vacuum.
For ex. due to corruption (either caused by bad hardware or by some bug)
if we get some error while vacuuming, it can help us identify the block
in heap and or additional index information.
It sets up an error context callback to display additional information
with the error. During different phases of vacuum (heap scan, heap
vacuum, index vacuum, index clean up, heap truncate), we update the error
context callback to display appropriate information. We can extend it to
a bit more granular level like adding the phases for FSM operations or for
prefetching the blocks while truncating. However, I felt that it requires
adding many more error callback function calls and can make the code a bit
complex, so left those for now.
Author: Justin Pryzby, with few changes by Amit Kapila
Reviewed-by: Alvaro Herrera, Amit Kapila, Andres Freund, Michael Paquier
and Sawada Masahiko
Discussion: https://www.postgresql.org/message-id/20191120210600.GC30362@telsasoft.com
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Put the temporary socket directory under TMPDIR, if that environment
variable is set, instead of the hardcoded /tmp.
This allows running the tests if there is no /tmp at all (for example
on Windows, although running the tests with Unix-domain sockets is not
enabled on Windows yet). We also use TMPDIR everywhere else /tmp is
hardcoded, so this makes the behavior consistent.
Reviewed-by: Andrew Dunstan <andrew.dunstan@2ndquadrant.com>
Discussion: https://www.postgresql.org/message-id/flat/54bde68c-d134-4eb8-5bd3-8af33b72a010@2ndquadrant.com
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Change F181 to supported. It requires that an embedded C program can
be split across multiple files, which ECPG easily supports.
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b07642dbc added code to trigger autovacuums based on the number of
inserts into a table. This seems to have caused some regression test
results to destabilize. I suspect this is due to autovacuum triggering a
vacuum sometime after the test's ANALYZE run and perhaps reltuples is
ending up being set to a slightly different value as a result.
Attempt to resolve this by running a VACUUM ANALYZE on the affected table
instead of just ANALYZE. pg_class.reltuples will still get set to whatever
ANALYZE chooses but we should no longer get the proceeding autovacuum
overriding that.
The overhead this adds to each test's runtime seems small enough not to
worry about. I measure 3-4% on stats_ext and can't measure any change in
partition_aggregate.
I'm unable to recreate the issue locally, so this is a bit of a blind
fix.
Discussion: https://postgr.es/m/CAApHDvpWmpqYrKwwDQyeDq8dAyK7GMNaxDhrG69CkSuXoEg%2BVg%40mail.gmail.com
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Use IndexRelationGetNumberOfKeyAttributes() rather than
IndexRelationGetNumberOfAttributes() when determining whether or not two
index tuples are suitable for merging together into a single posting
list tuple. This is a little bit tidier. It brings affected code in
nbtdedup.c a little closer to similar, related code in nbtsplitloc.c.
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In 9.4 I added support to use a historical snapshot in
ScanPgRelation(), while adding logical decoding. Unfortunately a
conflict with the concurrent removal of SnapshotNow was incorrectly
resolved, leading to an unregistered snapshot being used.
It is not correct to use an unregistered (or non-active) snapshot for
anything non-trivial, because catalog invalidations can cause the
snapshot to be invalidated.
Luckily it seems unlikely to actively cause problems in practice, as
ScanPgRelation() requires that we already have a lock on the relation,
we only look for a single row, and we don't appear to rely on the
result's tid to be correct. It however is clearly wrong and potential
negative consequences would likely be hard to find. So it seems worth
backpatching the fix, even without a concrete hazard.
Discussion: https://postgr.es/m/20200229052459.wzhqnbhrriezg4v2@alap3.anarazel.de
Backpatch: 9.5-
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Report and suggestions from Richard Guo and Tomas Vondra.
Discussion: https://postgr.es/m/CAMbWs4_W8fYbAn8KxgidAaZHON_Oo08OYn9ze=7remJymLqo5g@mail.gmail.com
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Instead of using Newton's method to compute numeric square roots, use
the Karatsuba square root algorithm, which performs better for numbers
of all sizes. In practice, this is 3-5 times faster for inputs with
just a few digits and up to around 10 times faster for larger inputs.
Also, the new algorithm guarantees that the final digit of the result
is correctly rounded, since it computes an integer square root with
truncation, containing at least 1 extra decimal digit before rounding.
The former algorithm would occasionally round the wrong way because
it rounded both the intermediate and final results.
In addition, arrange for sqrt_var() to explicitly support negative
rscale values (rounding before the decimal point). This allows the
argument reduction phase of ln_var() to be optimised for large inputs,
since it only needs to compute square roots with a few more digits
than the final ln() result, rather than computing all the digits
before the decimal point. For very large inputs, this can be many
thousands of times faster.
In passing, optimise div_var_fast() in a couple of places where it was
doing unnecessary work.
Patch be me, reviewed by Tom Lane and Tels.
Discussion: https://postgr.es/m/CAEZATCV1A7+jD3P30Zu31KjaxeSEyOn3v9d6tYegpxcq3cQu-g@mail.gmail.com
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As of Windows 10 version 1803, Unix-domain sockets are supported on
Windows. But it's not automatically detected by configure because it
looks for struct sockaddr_un and Windows doesn't define that. So we
just make our own definition on Windows and override the configure
result.
Set DEFAULT_PGSOCKET_DIR to empty on Windows so by default no
Unix-domain socket is used, because there is no good standard
location.
In pg_upgrade, we have to do some extra tweaking to preserve the
existing behavior of not using Unix-domain sockets on Windows. Adding
support would be desirable, but it needs further work, in particular a
way to select whether to use Unix-domain sockets from the command-line
or with a run-time test.
The pg_upgrade test script needs a fix. The previous code passed
"localhost" to postgres -k, which only happened to work because
Windows used to ignore the -k argument value altogether. We instead
need to pass an empty string to get the desired effect.
The test suites will continue to not use Unix-domain sockets on
Windows. This requires a small tweak in pg_regress.c. The TAP tests
don't need to be changed because they decide by the operating system
rather than HAVE_UNIX_SOCKETS.
Reviewed-by: Andrew Dunstan <andrew.dunstan@2ndquadrant.com>
Discussion: https://www.postgresql.org/message-id/flat/54bde68c-d134-4eb8-5bd3-8af33b72a010@2ndquadrant.com
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Formerly we applied a functional dependency "a => b with dependency
degree f" using the formula
P(a,b) = P(a) * [f + (1-f)*P(b)]
This leads to the possibility that the combined selectivity P(a,b)
could exceed P(b), which is not ideal. The addition of support for IN
and OR clauses (commits 8f321bd16c and ccaa3569f5) would seem to make
this more likely, since the user-supplied values in such clauses are
not necessarily compatible with the functional dependency.
Mitigate this by using the formula
P(a,b) = f * Min(P(a), P(b)) + (1-f) * P(a) * P(b)
instead, which guarantees that the combined selectivity is less than
each column's individual selectivity. Logically, this is modifies the
part of the formula that accounts for dependent rows to handle cases
where P(a) > P(b), whilst not changing the second term which accounts
for independent rows.
Additionally, this refactors the way that functional dependencies are
applied, so now dependencies_clauselist_selectivity() estimates both
the implying clauses and the implied clauses for each functional
dependency (formerly only the implied clauses were estimated), and now
all clauses for each attribute are taken into account (formerly only
one clause for each implied attribute was estimated). This removes the
previously built-in assumption that only equality clauses will be
seen, which is no longer true, and opens up the possibility of
applying functional dependencies to more general clauses.
Patch by me, reviewed by Tomas Vondra.
Discussion: https://postgr.es/m/CAEZATCXaNFZyOhR4XXAfkvj1tibRBEjje6ZbXwqWUB_tqbH%3Drw%40mail.gmail.com
Discussion: https://postgr.es/m/20200318002946.6dvblukm3cfmgir2%40development
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Feature C011 was still listed in sql_feature_packages.txt but had been
removed from sql_features.txt, so also remove from the former.
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