E.2. Release 16
Release date: 2023-09-14
E.2.1. Overview #
PostgreSQL 16 contains many new features and enhancements, including:
-
Allow parallelization of
FULL
and internal rightOUTER
hash joins -
Allow logical replication from standby servers
-
Allow logical replication subscribers to apply large transactions in parallel
-
Allow monitoring of I/O statistics using the new
pg_stat_io
view -
Add SQL/JSON constructors and identity functions
-
Improve performance of vacuum freezing
-
Add support for regular expression matching of user and database names in
pg_hba.conf
, and user names inpg_ident.conf
The above items and other new features of PostgreSQL 16 are explained in more detail in the sections below.
E.2.2. Migration to Version 16 #
A dump/restore using pg_dumpall or use of pg_upgrade or logical replication is required for those wishing to migrate data from any previous release. See Section 19.6 for general information on migrating to new major releases.
Version 16 contains a number of changes that may affect compatibility with previous releases. Observe the following incompatibilities:
-
Change assignment rules for PL/pgSQL bound cursor variables (Tom Lane)
Previously, the string value of such variables was set to match the variable name during cursor assignment; now it will be assigned during
OPEN
, and will not match the variable name. To restore the previous behavior, assign the desired portal name to the cursor variable beforeOPEN
. -
Disallow
NULLS NOT DISTINCT
indexes for primary keys (Daniel Gustafsson) -
Change
REINDEX DATABASE
and reindexdb to not process indexes on system catalogs (Simon Riggs)Processing such indexes is still possible using
REINDEX SYSTEM
andreindexdb --system
. -
Tighten
GENERATED
expression restrictions on inherited and partitioned tables (Amit Langote, Tom Lane)Columns of parent/partitioned and child/partition tables must all have the same generation status, though now the actual generation expressions can be different.
-
Remove pg_walinspect functions
pg_get_wal_records_info_till_end_of_wal()
andpg_get_wal_stats_till_end_of_wal()
(Bharath Rupireddy) -
Rename server variable
force_parallel_mode
todebug_parallel_query
(David Rowley) -
Remove the ability to create views manually with
ON SELECT
rules (Tom Lane) -
Remove the server variable
vacuum_defer_cleanup_age
(Andres Freund)This has been unnecessary since
hot_standby_feedback
and replication slots were added. -
Remove server variable
promote_trigger_file
(Simon Riggs)This was used to promote a standby to primary, but is now more easily accomplished with
pg_ctl promote
orpg_promote()
. -
Remove read-only server variables
lc_collate
andlc_ctype
(Peter Eisentraut)Collations and locales can vary between databases so having them as read-only server variables was unhelpful.
-
Role inheritance now controls the default inheritance status of member roles added during
GRANT
(Robert Haas)The role's default inheritance behavior can be overridden with the new
GRANT ... WITH INHERIT
clause. This allows inheritance of some roles and not others because the members' inheritance status is set atGRANT
time. Previously the inheritance status of member roles was controlled only by the role's inheritance status, and changes to a role's inheritance status affected all previous and future member roles. -
Restrict the privileges of
CREATEROLE
and its ability to modify other roles (Robert Haas)Previously roles with
CREATEROLE
privileges could change many aspects of any non-superuser role. Such changes, including adding members, now require the role requesting the change to haveADMIN OPTION
permission. For example, they can now change theCREATEDB
,REPLICATION
, andBYPASSRLS
properties only if they also have those permissions. -
Remove symbolic links for the postmaster binary (Peter Eisentraut)
E.2.3. Changes #
Below you will find a detailed account of the changes between PostgreSQL 16 and the previous major release.
E.2.3.1. Server #
E.2.3.1.1. Optimizer #
-
Allow incremental sorts in more cases, including
DISTINCT
(David Rowley) -
Add the ability for aggregates having
ORDER BY
orDISTINCT
to use pre-sorted data (David Rowley)The new server variable
enable_presorted_aggregate
can be used to disable this. -
Allow memoize atop a
UNION ALL
(Richard Guo) -
Allow anti-joins to be performed with the non-nullable input as the inner relation (Richard Guo)
-
Allow parallelization of
FULL
and internal rightOUTER
hash joins (Melanie Plageman, Thomas Munro) -
Improve the accuracy of
GIN
index access optimizer costs (Ronan Dunklau)
E.2.3.1.2. General Performance #
-
Allow more efficient addition of heap and index pages (Andres Freund)
-
During non-freeze operations, perform page freezing where appropriate (Peter Geoghegan)
This makes full-table freeze vacuums less necessary.
-
Allow window functions to use the faster
ROWS
mode internally whenRANGE
mode is active but unnecessary (David Rowley) -
Allow optimization of always-increasing window functions
ntile()
,cume_dist()
andpercent_rank()
(David Rowley) -
Allow aggregate functions
string_agg()
andarray_agg()
to be parallelized (David Rowley) -
Improve performance by caching
RANGE
andLIST
partition lookups (Amit Langote, Hou Zhijie, David Rowley) -
Allow control of the shared buffer usage by vacuum and analyze (Melanie Plageman)
The
VACUUM
/ANALYZE
option isBUFFER_USAGE_LIMIT
, and the vacuumdb option is--buffer-usage-limit
. The default value is set by server variablevacuum_buffer_usage_limit
, which also controls autovacuum. -
Support
wal_sync_method=fdatasync
on Windows (Thomas Munro) -
Allow HOT updates if only
BRIN
-indexed columns are updated (Matthias van de Meent, Josef Simanek, Tomas Vondra) -
Improve the speed of updating the process title (David Rowley)
-
Allow
xid
/subxid
searches and ASCII string detection to use vector operations (Nathan Bossart, John Naylor)ASCII detection is particularly useful for
COPY FROM
. Vector operations are also used for some C array searches. -
Reduce overhead of memory allocations (Andres Freund, David Rowley)
E.2.3.1.3. Monitoring #
-
Add system view
pg_stat_io
view to track I/O statistics (Melanie Plageman) -
Record statistics on the last sequential and index scans on tables (Dave Page)
This information appears in
pg_stat_*_tables
andpg_stat_*_indexes
. -
Record statistics on the occurrence of updated rows moving to new pages (Corey Huinker)
The
pg_stat_*_tables
column isn_tup_newpage_upd
. -
Add speculative lock information to the
pg_locks
system view (Masahiko Sawada, Noriyoshi Shinoda)The transaction id is displayed in the
transactionid
column and the speculative insertion token is displayed in theobjid
column. -
Add the display of prepared statement result types to the
pg_prepared_statements
view (Dagfinn Ilmari Mannsåker) -
Create subscription statistics entries at subscription creation time so
stats_reset
is accurate (Andres Freund)Previously entries were created only when the first statistics were reported.
-
Correct the I/O accounting for temp relation writes shown in
pg_stat_database
(Melanie Plageman) -
Add function
pg_stat_get_backend_subxact()
to report on a session's subtransaction cache (Dilip Kumar) -
Have
pg_stat_get_backend_idset()
,pg_stat_get_backend_activity()
, and related functions use the unchanging backend id (Nathan Bossart)Previously the index values might change during the lifetime of the session.
-
Report stand-alone backends with a special backend type (Melanie Plageman)
-
Add wait event
SpinDelay
to report spinlock sleep delays (Andres Freund) -
Create new wait event
DSMAllocate
to indicate waiting for dynamic shared memory allocation (Thomas Munro)Previously this type of wait was reported as
DSMFillZeroWrite
, which was also used bymmap()
allocations. -
Add the database name to the process title of logical WAL senders (Tatsuhiro Nakamori)
Physical WAL senders do not display a database name.
-
Add checkpoint and
REDO LSN
information tolog_checkpoints
messages (Bharath Rupireddy, Kyotaro Horiguchi) -
Provide additional details during client certificate failures (Jacob Champion)
E.2.3.1.4. Privileges #
-
Add predefined role
pg_create_subscription
with permission to create subscriptions (Robert Haas) -
Allow subscriptions to not require passwords (Robert Haas)
This is accomplished with the option
password_required=false
. -
Simplify permissions for
LOCK TABLE
(Jeff Davis)Previously a user's ability to perform
LOCK TABLE
at various lock levels was limited to the lock levels required by the commands they had permission to execute on the table. For example, someone withUPDATE
permission could perform all lock levels exceptACCESS SHARE
, even though it was a lesser lock level. Now users can issue lesser lock levels if they already have permission for greater lock levels. -
Allow
ALTER GROUP group_name ADD USER user_name
to be performed withADMIN OPTION
(Robert Haas)Previously
CREATEROLE
permission was required. -
Allow
GRANT
to useWITH ADMIN TRUE
/FALSE
syntax (Robert Haas)Previously only the
WITH ADMIN OPTION
syntax was supported. -
Allow roles that create other roles to automatically inherit the new role's rights or the ability to
SET ROLE
to the new role (Robert Haas, Shi Yu)This is controlled by server variable
createrole_self_grant
. -
Prevent users from changing the default privileges of non-inherited roles (Robert Haas)
This is now only allowed for inherited roles.
-
When granting role membership, require the granted-by role to be a role that has appropriate permissions (Robert Haas)
This is a requirement even when a non-bootstrap superuser is granting role membership.
-
Allow non-superusers to grant permissions using a granted-by user that is not the current user (Robert Haas)
The current user still must have sufficient permissions given by the specified granted-by user.
-
Add
GRANT
to control permission to useSET ROLE
(Robert Haas)This is controlled by a new
GRANT ... SET
option. -
Add dependency tracking to roles which have granted privileges (Robert Haas)
For example, removing
ADMIN OPTION
will fail if there are privileges using that option;CASCADE
must be used to revoke dependent permissions. -
Add dependency tracking of grantors for
GRANT
records (Robert Haas)This guarantees that
pg_auth_members
.grantor
values are always valid. -
Allow multiple role membership records (Robert Haas)
Previously a new membership grant would remove a previous matching membership grant, even if other aspects of the grant did not match.
-
Prevent removal of superuser privileges for the bootstrap user (Robert Haas)
Restoring such users could lead to errors.
-
Allow
makeaclitem()
to accept multiple privilege names (Robins Tharakan)Previously only a single privilege name, like
SELECT
, was accepted.
E.2.3.1.5. Server Configuration #
-
Add support for Kerberos credential delegation (Stephen Frost)
This is enabled with server variable
gss_accept_delegation
and libpq connection parametergssdelegation
. -
Allow the SCRAM iteration count to be set with server variable
scram_iterations
(Daniel Gustafsson) -
Improve performance of server variable management (Tom Lane)
-
Tighten restrictions on which server variables can be reset (Masahiko Sawada)
Previously, while certain variables, like
transaction_isolation
, were not affected byRESET ALL
, they could be individually reset in inappropriate situations. -
Move various
postgresql.conf
items into new categories (Shinya Kato)This also affects the categories displayed in the
pg_settings
view. -
Prevent configuration file recursion beyond 10 levels (Julien Rouhaud)
-
Allow autovacuum to more frequently honor changes to delay settings (Melanie Plageman)
Rather than honor changes only at the start of each relation, honor them at the start of each block.
-
Remove restrictions that archive files be durably renamed (Nathan Bossart)
The
archive_command
command is now more likely to be called with already-archived files after a crash. -
Prevent
archive_library
andarchive_command
from being set at the same time (Nathan Bossart)Previously
archive_library
would overridearchive_command
. -
Allow the postmaster to terminate children with an abort signal (Tom Lane)
This allows collection of a core dump for a stuck child process. This is controlled by
send_abort_for_crash
andsend_abort_for_kill
. The postmaster's-T
switch is now the same as settingsend_abort_for_crash
. -
Remove the non-functional postmaster
-n
option (Tom Lane) -
Allow the server to reserve backend slots for roles with
pg_use_reserved_connections
membership (Nathan Bossart)The number of reserved slots is set by server variable
reserved_connections
. -
Allow huge pages to work on newer versions of Windows 10 (Thomas Munro)
This adds the special handling required to enable huge pages on newer versions of Windows 10 .
-
Add
debug_io_direct
setting for developer usage (Thomas Munro, Andres Freund, Bharath Rupireddy)While primarily for developers,
wal_sync_method=open_sync
/open_datasync
has been modified to not use direct I/O withwal_level=minimal
; this is now enabled withdebug_io_direct=wal
. -
Add function
pg_split_walfile_name()
to report the segment and timeline values of WAL file names (Bharath Rupireddy)
E.2.3.1.6. pg_hba.conf #
-
Add support for regular expression matching on database and role entries in
pg_hba.conf
(Bertrand Drouvot)Regular expression patterns are prefixed with a slash. Database and role names that begin with slashes need to be double-quoted if referenced in
pg_hba.conf
. -
Improve user-column handling of
pg_ident.conf
to matchpg_hba.conf
(Jelte Fennema)Specifically, add support for
all
, role membership with+
, and regular expressions with a leading slash. Any user name that matches these patterns must be double-quoted. -
Allow include files in
pg_hba.conf
andpg_ident.conf
(Julien Rouhaud)These are controlled by
include
,include_if_exists
, andinclude_dir
. System viewspg_hba_file_rules
andpg_ident_file_mappings
now display the file name. -
Allow
pg_hba.conf
tokens to be of unlimited length (Tom Lane) -
Add rule and map numbers to the system view
pg_hba_file_rules
(Julien Rouhaud)
E.2.3.1.7. Localization #
-
Determine the default encoding from the locale when using ICU (Jeff Davis)
Previously the default was always
UTF-8
. -
Have
CREATE DATABASE
andCREATE COLLATION
'sLOCALE
options, and initdb and createdb--locale
options, control non- libc collation providers (Jeff Davis)Previously they only controlled libc providers.
-
Add predefined collations
unicode
anducs_basic
(Peter Eisentraut)This only works if ICU support is enabled.
-
Allow custom ICU collation rules to be created (Peter Eisentraut)
This is done using
CREATE COLLATION
's newRULES
clause, as well as new options forCREATE DATABASE
, createdb , and initdb . -
Allow Windows to import system locales automatically (Juan José Santamaría Flecha)
Previously, only ICU locales could be imported on Windows .
E.2.3.2. Logical Replication #
-
Allow logical decoding on standbys (Bertrand Drouvot, Andres Freund, Amit Khandekar)
Snapshot WAL records are required for logical slot creation but cannot be created on standbys. To avoid delays, the new function
pg_log_standby_snapshot()
allows creation of such records. -
Add server variable to control how logical decoding publishers transfer changes and how subscribers apply them (Shi Yu)
The variable is
debug_logical_replication_streaming
. -
Allow logical replication initial table synchronization to copy rows in binary format (Melih Mutlu)
This is only possible for subscriptions marked as binary.
-
Allow parallel application of logical replication (Hou Zhijie, Wang Wei, Amit Kapila)
The
CREATE SUBSCRIPTION
STREAMING
option now supportsparallel
to enable application of large transactions by parallel workers. The number of parallel workers is controlled by the new server variablemax_parallel_apply_workers_per_subscription
. Wait eventsLogicalParallelApplyMain
,LogicalParallelApplyStateChange
, andLogicalApplySendData
were also added. Columnleader_pid
was added to system viewpg_stat_subscription
to track parallel activity. -
Improve performance for logical replication apply without a primary key (Onder Kalaci, Amit Kapila)
Specifically,
REPLICA IDENTITY FULL
can now use btree indexes rather than sequentially scanning the table to find matches. -
Allow logical replication subscribers to process only changes that have no origin (Vignesh C, Amit Kapila)
This can be used to avoid replication loops. This is controlled by the new
CREATE SUBSCRIPTION ... ORIGIN
option. -
Perform logical replication
SELECT
and DML actions as the table owner (Robert Haas)This improves security and now requires subscription owners to be either superusers or to have
SET ROLE
permission on all roles owning tables in the replication set. The previous behavior of performing all operations as the subscription owner can be enabled with the subscriptionrun_as_owner
option. -
Have
wal_retrieve_retry_interval
operate on a per-subscription basis (Nathan Bossart)Previously the retry time was applied globally. This also adds wait events >
LogicalRepLauncherDSA
andLogicalRepLauncherHash
.
E.2.3.3. Utility Commands #
-
Add
EXPLAIN
optionGENERIC_PLAN
to display the generic plan for a parameterized query (Laurenz Albe) -
Allow a
COPY FROM
value to map to a column'sDEFAULT
(Israel Barth Rubio) -
Allow
COPY
into foreign tables to add rows in batches (Andrey Lepikhov, Etsuro Fujita)This is controlled by the postgres_fdw option
batch_size
. -
Allow the
STORAGE
type to be specified byCREATE TABLE
(Teodor Sigaev, Aleksander Alekseev)Previously only
ALTER TABLE
could control this. -
Allow truncate triggers on foreign tables (Yugo Nagata)
-
Allow
VACUUM
and vacuumdb to only processTOAST
tables (Nathan Bossart)This is accomplished by having
VACUUM
turn offPROCESS_MAIN
or by vacuumdb using the--no-process-main
option. -
Add
VACUUM
options to skip or update all frozen statistics (Tom Lane, Nathan Bossart)The options are
SKIP_DATABASE_STATS
andONLY_DATABASE_STATS
. -
Change
REINDEX DATABASE
andREINDEX SYSTEM
to no longer require an argument (Simon Riggs)Previously the database name had to be specified.
-
Allow
CREATE STATISTICS
to generate a statistics name if none is specified (Simon Riggs)
E.2.3.4. Data Types #
-
Allow non-decimal integer literals (Peter Eisentraut)
For example,
0x42F
,0o273
, and0b100101
. -
Allow
NUMERIC
to process hexadecimal, octal, and binary integers of any size (Dean Rasheed)Previously only unquoted eight-byte integers were supported with these non-decimal bases.
-
Allow underscores in integer and numeric constants (Peter Eisentraut, Dean Rasheed)
This can improve readability for long strings of digits.
-
Accept the spelling
+infinity
in datetime input (Vik Fearing) -
Prevent the specification of
epoch
andinfinity
together with other fields in datetime strings (Joseph Koshakow) -
Remove undocumented support for date input in the form
Y
(Joseph Koshakow)year
Mmonth
Dday
-
Add functions
pg_input_is_valid()
andpg_input_error_info()
to check for type conversion errors (Tom Lane)
E.2.3.5. General Queries #
-
Allow subqueries in the
FROM
clause to omit aliases (Dean Rasheed) -
Add support for enhanced numeric literals in SQL/JSON paths (Peter Eisentraut)
For example, allow hexadecimal, octal, and binary integers and underscores between digits.
E.2.3.6. Functions #
-
Add SQL/JSON constructors (Nikita Glukhov, Teodor Sigaev, Oleg Bartunov, Alexander Korotkov, Amit Langote)
The new functions
JSON_ARRAY()
,JSON_ARRAYAGG()
,JSON_OBJECT()
, andJSON_OBJECTAGG()
are part of the SQL standard. -
Add SQL/JSON object checks (Nikita Glukhov, Teodor Sigaev, Oleg Bartunov, Alexander Korotkov, Amit Langote, Andrew Dunstan)
The
IS JSON
checks include checks for values, arrays, objects, scalars, and unique keys. -
Allow JSON string parsing to use vector operations (John Naylor)
-
Improve the handling of full text highlighting function
ts_headline()
forOR
andNOT
expressions (Tom Lane) -
Add functions to add, subtract, and generate
timestamptz
values in a specified time zone (Przemyslaw Sztoch, Gurjeet Singh)The functions are
date_add()
,date_subtract()
, andgenerate_series()
. -
Change
date_trunc(unit, timestamptz, time_zone)
to be an immutable function (Przemyslaw Sztoch)This allows the creation of expression indexes using this function.
-
Add server variable
SYSTEM_USER
(Bertrand Drouvot)This reports the authentication method and its authenticated user.
-
Add functions
array_sample()
andarray_shuffle()
(Martin Kalcher) -
Add aggregate function
ANY_VALUE()
which returns any value from a set (Vik Fearing) -
Add function
random_normal()
to supply normally-distributed random numbers (Paul Ramsey) -
Add error function
erf()
and its complementerfc()
(Dean Rasheed) -
Improve the accuracy of numeric
power()
for integer exponents (Dean Rasheed) -
Add
XMLSERIALIZE()
optionINDENT
to pretty-print its output (Jim Jones) -
Change
pg_collation_actual_version()
to return a reasonable value for the default collation (Jeff Davis)Previously it returned
NULL
. -
Allow
pg_read_file()
andpg_read_binary_file()
to ignore missing files (Kyotaro Horiguchi) -
Add byte specification (
B
) topg_size_bytes()
(Peter Eisentraut) -
Allow
to_reg
* functions to accept numeric OID s as input (Tom Lane)
-
Add the ability to get the current function's OID in PL/pgSQL (Pavel Stehule)
This is accomplished with
GET DIAGNOSTICS variable = PG_ROUTINE_OID
.
-
Add libpq connection option
require_auth
to specify a list of acceptable authentication methods (Jacob Champion)This can also be used to disallow certain authentication methods.
-
Allow multiple libpq -specified hosts to be randomly selected (Jelte Fennema)
This is enabled with
load_balance_hosts=random
and can be used for load balancing. -
Add libpq option
sslcertmode
to control transmission of the client certificate (Jacob Champion)The option values are
disable
,allow
, andrequire
. -
Allow libpq to use the system certificate pool for certificate verification (Jacob Champion, Thomas Habets)
This is enabled with
sslrootcert=system
, which also enablessslmode=verify-full
.
E.2.3.9. Client Applications #
-
Allow
ECPG
variable declarations to use typedef names that match unreserved SQL keywords (Tom Lane)This change does prevent keywords which match C typedef names from being processed as keywords in later
EXEC SQL
blocks.
-
Allow psql to control the maximum width of header lines in expanded format (Platon Pronko)
This is controlled by
xheader_width
. -
Add psql command
\drg
to show role membership details (Pavel Luzanov)The
Member of
output column has been removed from\du
and\dg
because this new command displays this information in more detail. -
Allow psql 's access privilege commands to show system objects (Nathan Bossart)
-
Add
FOREIGN
designation to psql\d+
for foreign table children and partitions (Ian Lawrence Barwick) -
Prevent
\df+
from showing function source code (Isaac Morland)Function bodies are more easily viewed with
\sf
. -
Allow psql to submit queries using the extended query protocol (Peter Eisentraut)
Passing arguments to such queries is done using the new psql
\bind
command. -
Allow psql
\watch
to limit the number of executions (Andrey Borodin)The
\watch
options can now be named when specified. -
Detect invalid values for psql
\watch
, and allow zero to specify no delay (Andrey Borodin) -
Allow psql scripts to obtain the exit status of shell commands and queries (Corey Huinker, Tom Lane)
The new psql control variables are
SHELL_ERROR
andSHELL_EXIT_CODE
. -
Various psql tab completion improvements (Vignesh C, Aleksander Alekseev, Dagfinn Ilmari Mannsåker, Shi Yu, Michael Paquier, Ken Kato, Peter Smith)
-
Add pg_dump control of dumping child tables and partitions (Gilles Darold)
The new options are
--table-and-children
,--exclude-table-and-children
, and--exclude-table-data-and-children
. -
Add LZ4 and Zstandard compression to pg_dump (Georgios Kokolatos, Justin Pryzby)
-
Allow pg_dump and pg_basebackup to use
long
mode for compression (Justin Pryzby) -
Improve pg_dump to accept a more consistent compression syntax (Georgios Kokolatos)
Options like
--compress=gzip:5
.
E.2.3.10. Server Applications #
-
Add initdb option to set server variables for the duration of initdb and all future server starts (Tom Lane)
The option is
-c name=value
. -
Add options to createuser to control more user options (Shinya Kato)
Specifically, the new options control the valid-until date, bypassing of row-level security, and role membership.
-
Deprecate createuser option
--role
(Nathan Bossart)This option could be easily confused with new createuser role membership options, so option
--member-of
has been added with the same functionality. The--role
option can still be used. -
Allow control of vacuumdb schema processing (Gilles Darold)
These are controlled by options
--schema
and--exclude-schema
. -
Use new
VACUUM
options to improve the performance of vacuumdb (Tom Lane, Nathan Bossart) -
Have pg_upgrade set the new cluster's locale and encoding (Jeff Davis)
This removes the requirement that the new cluster be created with the same locale and encoding settings.
-
Add pg_upgrade option to specify the default transfer mode (Peter Eisentraut)
The option is
--copy
. -
Improve pg_basebackup to accept numeric compression options (Georgios Kokolatos, Michael Paquier)
Options like
--compress=server-5
are now supported. -
Fix pg_basebackup to handle tablespaces stored in the
PGDATA
directory (Robert Haas) -
Add pg_waldump option
--save-fullpage
to dump full page images (David Christensen) -
Allow pg_waldump options
-t
/--timeline
to accept hexadecimal values (Peter Eisentraut) -
Add support for progress reporting to pg_verifybackup (Masahiko Sawada)
-
Allow pg_rewind to properly track timeline changes (Heikki Linnakangas)
Previously if pg_rewind was run after a timeline switch but before a checkpoint was issued, it might incorrectly determine that a rewind was unnecessary.
-
Have pg_receivewal and pg_recvlogical cleanly exit on
SIGTERM
(Christoph Berg)This signal is often used by systemd .
E.2.3.11. Source Code #
-
Build ICU support by default (Jeff Davis)
This removes build flag
--with-icu
and adds flag--without-icu
. -
Add support for SSE2 (Streaming SIMD Extensions 2) vector operations on x86-64 architectures (John Naylor)
-
Add support for Advanced SIMD (Single Instruction Multiple Data) ( NEON ) instructions on ARM architectures (Nathan Bossart)
-
Have Windows binaries built with MSVC use
RandomizedBaseAddress
( ASLR ) (Michael Paquier)This was already enabled on MinGW builds.
-
Prevent extension libraries from exporting their symbols by default (Andres Freund, Tom Lane)
Functions that need to be called from the core backend or other extensions must now be explicitly marked
PGDLLEXPORT
. -
Require Windows 10 or newer versions (Michael Paquier, Juan José Santamaría Flecha)
Previously Windows Vista and Windows XP were supported.
-
Require Perl version 5.14 or later (John Naylor)
-
Require Bison version 2.3 or later (John Naylor)
-
Require Flex version 2.5.35 or later (John Naylor)
-
Require MIT Kerberos for GSSAPI support (Stephen Frost)
-
Remove support for Visual Studio 2013 (Michael Paquier)
-
Remove support for HP-UX (Thomas Munro)
-
Remove support for HP/Intel Itanium (Thomas Munro)
-
Remove support for M68K , M88K , M32R , and SuperH CPU architectures (Thomas Munro)
-
Remove libpq support for SCM credential authentication (Michael Paquier)
Backend support for this authentication method was removed in PostgresSQL 9.1.
-
Add meson build system (Andres Freund, Nazir Bilal Yavuz, Peter Eisentraut)
This eventually will replace the Autoconf and Windows -based MSVC build systems.
-
Allow control of the location of the openssl binary used by the build system (Peter Eisentraut)
Make finding openssl program a configure or meson option
-
Add build option to allow testing of small table segment sizes (Andres Freund)
The build options are
--with-segsize-blocks
and-Dsegsize_blocks
. -
Add pgindent options (Andrew Dunstan)
The new options are
--show-diff
,--silent-diff
,--commit
, and--help
, and allow multiple--exclude
options. Also require the typedef file to be explicitly specified. Options--code-base
and--build
were also removed. -
Add pg_bsd_indent source code to the main tree (Tom Lane)
-
Improve make_ctags and make_etags (Yugo Nagata)
-
Adjust
pg_attribute
columns for efficiency (Peter Eisentraut)
E.2.3.12. Additional Modules #
-
Improve use of extension-based indexes on boolean columns (Zongliang Quan, Tom Lane)
-
Add support for Daitch-Mokotoff Soundex to fuzzystrmatch (Dag Lem)
-
Allow auto_explain to log values passed to parameterized statements (Dagfinn Ilmari Mannsåker)
This affects queries using server-side
PREPARE
/EXECUTE
and client-side parse/bind. Logging is controlled byauto_explain.log_parameter_max_length
; by default query parameters will be logged with no length restriction. -
Have auto_explain 's
log_verbose
mode honor the value ofcompute_query_id
(Atsushi Torikoshi)Previously even if
compute_query_id
was enabled,log_verbose
was not showing the query identifier. -
Change the maximum length of ltree labels from 256 to 1000 and allow hyphens (Garen Torikian)
-
Have
pg_stat_statements
normalize constants used in utility commands (Michael Paquier)Previously constants appeared instead of placeholders, e.g.,
$1
. -
Add pg_walinspect function
pg_get_wal_block_info()
to report WAL block information (Michael Paquier, Melanie Plageman, Bharath Rupireddy) -
Change how pg_walinspect functions
pg_get_wal_records_info()
andpg_get_wal_stats()
interpret ending LSN s (Bharath Rupireddy)Previously ending LSN s which represent nonexistent WAL locations would generate an error, while they will now be interpreted as the end of the WAL .
-
Add detailed descriptions of WAL records in pg_walinspect and pg_waldump (Melanie Plageman, Peter Geoghegan)
-
Add pageinspect function
bt_multi_page_stats()
to report statistics on multiple pages (Hamid Akhtar)This is similar to
bt_page_stats()
except it can report on a range of pages. -
Add empty range output column to pageinspect function
brin_page_items()
(Tomas Vondra) -
Redesign archive modules to be more flexible (Nathan Bossart)
Initialization changes will require modules written for older versions of Postgres to be updated.
-
Correct inaccurate pg_stat_statements row tracking extended query protocol statements (Sami Imseih)
-
Add pg_buffercache function
pg_buffercache_usage_counts()
to report usage totals (Nathan Bossart) -
Add pg_buffercache function
pg_buffercache_summary()
to report summarized buffer statistics (Melih Mutlu) -
Allow the schemas of required extensions to be referenced in extension scripts using the new syntax
@extschema:referenced_extension_name@
(Regina Obe) -
Allow required extensions to be marked as non-relocatable using
no_relocate
(Regina Obe)This allows
@extschema:referenced_extension_name@
to be treated as a constant for the lifetime of the extension.
E.2.3.12.1. postgres_fdw #
-
Allow postgres_fdw to do aborts in parallel (Etsuro Fujita)
This is enabled with postgres_fdw option
parallel_abort
. -
Make
ANALYZE
on foreign postgres_fdw tables more efficient (Tomas Vondra)The postgres_fdw option
analyze_sampling
controls the sampling method. -
Restrict shipment of
reg
* type constants in postgres_fdw to those referencing built-in objects or extensions marked as shippable (Tom Lane) -
Have postgres_fdw and dblink handle interrupts during connection establishment (Andres Freund)
E.2.4. Acknowledgments #
The following individuals (in alphabetical order) have contributed to this release as patch authors, committers, reviewers, testers, or reporters of issues.
Abhijit Menon-Sen |
Adam Mackler |
Adrian Klaver |
Ahsan Hadi |
Ajin Cherian |
Ajit Awekar |
Alan Hodgson |
Aleksander Alekseev |
Alex Denman |
Alex Kozhemyakin |
Alexander Korolev |
Alexander Korotkov |
Alexander Lakhin |
Alexander Pyhalov |
Alexey Borzov |
Alexey Ermakov |
Alexey Makhmutov |
Álvaro Herrera |
Amit Kapila |
Amit Khandekar |
Amit Langote |
Amul Sul |
Anastasia Lubennikova |
Anban Company |
Andreas Dijkman |
Andreas Karlsson |
Andreas Scherbaum |
Andrei Zubkov |
Andres Freund |
Andrew Alsup |
Andrew Bille |
Andrew Dunstan |
Andrew Gierth |
Andrew Kesper |
Andrey Borodin |
Andrey Lepikhov |
Andrey Sokolov |
Ankit Kumar Pandey |
Ante Kresic |
Anton Melnikov |
Anton Sidyakin |
Anton Voloshin |
Antonin Houska |
Arne Roland |
Artem Anisimov |
Arthur Zakirov |
Ashutosh Bapat |
Ashutosh Sharma |
Asim Praveen |
Atsushi Torikoshi |
Ayaki Tachikake |
Balazs Szilfai |
Benoit Lobréau |
Bernd Helmle |
Bertrand Drouvot |
Bharath Rupireddy |
Bilva Sanaba |
Bob Krier |
Boris Zentner |
Brad Nicholson |
Brar Piening |
Bruce Momjian |
Bruno da Silva |
Carl Sopchak |
Cary Huang |
Changhong Fei |
Chris Travers |
Christoph Berg |
Christophe Pettus |
Corey Huinker |
Craig Ringer |
Curt Kolovson |
Dag Lem |
Dagfinn Ilmari Mannsåker |
Daniel Gustafsson |
Daniel Vérité |
Daniel Watzinger |
Daniel Westermann |
Daniele Varrazzo |
Daniil Anisimov |
Danny Shemesh |
Dave Page |
David Christensen |
David G. Johnston |
David Geier |
David Gilman |
David Kimura |
David Rowley |
David Steele |
David Turon |
David Zhang |
Davinder Singh |
Dean Rasheed |
Denis Laxalde |
Dilip Kumar |
Dimos Stamatakis |
Dmitriy Kuzmin |
Dmitry Astapov |
Dmitry Dolgov |
Dmitry Koval |
Dong Wook Lee |
Dongming Liu |
Drew DeVault |
Duncan Sands |
Ed Maste |
Egor Chindyaskin |
Ekaterina Kiryanova |
Elena Indrupskaya |
Emmanuel Quincerot |
Eric Mutta |
Erik Rijkers |
Erki Eessaar |
Erwin Brandstetter |
Etsuro Fujita |
Eugeny Zhuzhnev |
Euler Taveira |
Evan Jones |
Evgeny Morozov |
Fabrízio de Royes Mello |
Farias de Oliveira |
Florin Irion |
Franz-Josef Färber |
Garen Torikian |
Georgios Kokolatos |
Gilles Darold |
Greg Stark |
Guillaume Lelarge |
Gunnar Bluth |
Gunnar Morling |
Gurjeet Singh |
Haiyang Wang |
Haiying Tang |
Hamid Akhtar |
Hans Buschmann |
Hao Wu |
Hayato Kuroda |
Heath Lord |
Heikki Linnakangas |
Himanshu Upadhyaya |
Hisahiro Kauchi |
Hongyu Song |
Hubert Lubaczewski |
Hung Nguyen |
Ian Barwick |
Ibrar Ahmed |
Ilya Gladyshev |
Ilya Nenashev |
Isaac Morland |
Israel Barth Rubio |
Jacob Champion |
Jacob Speidel |
Jaime Casanova |
Jakub Wartak |
James Coleman |
James Inform |
James Vanns |
Jan Wieck |
Japin Li |
Jeevan Ladhe |
Jeff Davis |
Jeff Janes |
Jehan-Guillaume de Rorthais |
Jelte Fennema |
Jian He |
Jim Jones |
Jinbao Chen |
Joe Conway |
Joel Jacobson |
John Naylor |
Jonathan Katz |
Josef Simanek |
Joseph Koshakow |
Juan José Santamaría Flecha |
Julien Rouhaud |
Julien Roze |
Junwang Zhao |
Justin Pryzby |
Justin Zhang |
Karina Litskevich |
Karl O. Pinc |
Keisuke Kuroda |
Ken Kato |
Kevin McKibbin |
Kieran McCusker |
Kirk Wolak |
Konstantin Knizhnik |
Koshi Shibagaki |
Kotaro Kawamoto |
Kui Liu |
Kyotaro Horiguchi |
Lakshmi Narayanan Sreethar |
Laurence Parry |
Laurenz Albe |
Luca Ferrari |
Lukas Fittl |
Maciek Sakrejda |
Magnus Hagander |
Maja Zaloznik |
Marcel Hofstetter |
Marina Polyakova |
Mark Dilger |
Marko Tiikkaja |
Markus Winand |
Martijn van Oosterhout |
Martin Jurca |
Martin Kalcher |
Mary Xu |
Masahiko Sawada |
Masahiro Ikeda |
Masao Fujii |
Mason Sharp |
Matheus Alcantara |
Mats Kindahl |
Matthias van de Meent |
Matthijs van der Vleuten |
Maxim Orlov |
Maxim Yablokov |
Mehmet Emin Karakas |
Melanie Plageman |
Melih Mutlu |
Micah Gate |
Michael Banck |
Michael Paquier |
Michail Nikolaev |
Michel Pelletier |
Mike Oh |
Mikhail Gribkov |
Mingli Zhang |
Miroslav Bendik |
Mitsuru Hinata |
Myo Wai Thant |
Naeem Akhter |
Naoki Okano |
Nathan Bossart |
Nazir Bilal Yavuz |
Neha Sharma |
Nick Babadzhanian |
Nicola Contu |
Nikhil Shetty |
Nikita Glukhov |
Nikolay Samokhvalov |
Nikolay Shaplov |
Nishant Sharma |
Nitin Jadhav |
Noah Misch |
Noboru Saito |
Noriyoshi Shinoda |
Nuko Yokohama |
Oleg Bartunov |
Oleg Tselebrovskiy |
Olly Betts |
Onder Kalaci |
Onur Tirtir |
Pablo Federico |
Palle Girgensohn |
Paul Guo |
Paul Jungwirth |
Paul Ramsey |
Pavel Borisov |
Pavel Kulakov |
Pavel Luzanov |
Pavel Stehule |
Peifeng Qiu |
Peter Eisentraut |
Peter Geoghegan |
Peter Smith |
Phil Florent |
Philippe Godfrin |
Platon Pronko |
Przemyslaw Sztoch |
Rachel Heaton |
Ranier Vilela |
Regina Obe |
Reid Thompson |
Reiner Peterke |
Richard Guo |
Riivo Kolka |
Rishu Bagga |
Robert Haas |
Robert Sjöblom |
Robert Treat |
Roberto Mello |
Robins Tharakan |
Roman Zharkov |
Ronan Dunklau |
Rushabh Lathia |
Ryo Matsumura |
Samay Sharma |
Sami Imseih |
Sandeep Thakkar |
Sandro Santilli |
Sebastien Flaesch |
Sébastien Lardière |
Sehrope Sarkuni |
Sergey Belyashov |
Sergey Pankov |
Sergey Shinderuk |
Shi Yu |
Shinya Kato |
Sho Kato |
Shruthi Gowda |
Shveta Mallik |
Simon Riggs |
Sindy Senorita |
Sirisha Chamarthi |
Sravan Kumar |
Stéphane Tachoires |
Stephen Frost |
Steve Chavez |
Stone Tickle |
Sven Klemm |
Takamichi Osumi |
Takeshi Ideriha |
Tatsuhiro Nakamori |
Tatsuo Ishii |
Teja Mupparti |
Tender Wang |
Teodor Sigaev |
Thiago Nunes |
Thom Brown |
Thomas Habets |
Thomas Mc Kay |
Thomas Munro |
Tim Carey-Smith |
Tim Field |
Timo Stolz |
Tom Lane |
Tomas Vondra |
Tor Erik Linnerud |
Torsten Förtsch |
Tristan Partin |
Troy Frericks |
Tushar Ahuja |
Valerie Woolard |
Vibhor Kumar |
Victor Spirin |
Victoria Shepard |
Vignesh C |
Vik Fearing |
Vitaly Burovoy |
Vitaly Davydov |
Wang Wei |
Wenjing Zeng |
Whale Song |
Will Mortensen |
Wolfgang Walther |
Xin Wen |
Xing Guo |
Xingwang Xu |
XueJing Zhao |
Yanliang Lei |
Youmiu Mo |
Yugo Nagata |
Yura Sokolov |
Yuta Katsuragi |
Zhen Mingyang |
Zheng Li |
Zhihong Yu |
Zhijie Hou |
Zongliang Quan |
Zuming Jiang |