E.27. Postgres Pro Standard 12.1.1
Release Date: 2019-12-23
E.27.1. Overview
This release is based on PostgreSQL 12.1 and includes all the new features introduced in PostgreSQL 12, as well as bug fixes implemented in PostgreSQL 12.1. For their detailed description, see PostgreSQL 12 Release Notes and PostgreSQL 12.1 Release Notes, respectively.
All the features developed for Postgres Pro Standard 11.6.1 or lower have been ported, including core patches and extension modules, except for the following:
The
pg_recovery_settingsview is no longer required because therecovery.confsettings have been integrated intopostgresql.confand can now be viewed via the pg_settings system view;primary_conninfo,restore_command, andprimary_slot_nameparameters can still be changed without restarting the server.Reduction of WAL overhead for creation of GiST, GIN, and SP-GiST indexes has been committed to PostgreSQL 12, so Postgres Pro now inherits its modified implementation. The index format has not changed, so all these indexes should remain valid.
PTRACK has been thoroughly reworked and now has a new API. If you have been taking PTRACK backups using pg_probackup, you will have to upgrade it to version 2.2.6 or higher.
For the list of extension modules and utilities specific to Postgres Pro Standard, as well as the main user-visible core changes as compared to vanilla PostgreSQL, see Section 2.
Important
Starting from Postgres Pro 12, using pg_pathman is not recommended. Use vanilla declarative partitioning instead, as described in Section 5.11.
E.27.2. Migration to Version 12
You can migrate to Postgres Pro Standard 12 from the same or a previous version of PostgreSQL (that is supported by the upgrade method chosen) and from a previous version of Postgres Pro Standard. See Section 17.6 for the methods to upgrade your database cluster. Consult the Postgres Pro Standard support team if you experience issues during migration. Backward migration is not supported.
To migrate from PostgreSQL or a Postgres Pro Standard release based on a previous PostgreSQL major version, make sure to install its latest available minor version and then perform a dump/restore using pg_dumpall or use the pg_upgrade utility:
If you choose to run pg_upgrade, make sure to initialize the new database cluster with compatible parameters. In particular, pay attention to the provider of the default collation and the checksum settings in the cluster you are migrating from. If pg_upgrade creates any SQL files in its current directory, run these files to complete the upgrade.
If you are opting for a dump/restore, do not forget to use the
--add-collprovideroption to correctly choose the provider for the default collation of the migrated database.
To find out the default collation and its provider in the original cluster, see the datcollate value for the template0 database in the pg_database catalog. If you are upgrading from a version where provider of the default collation is not specified, use libc provider if upgrading from vanilla PostgreSQL, and omit the provider if upgrading from earlier versions of Postgres Pro.
Besides, note the following collation-related upgrade specifics described below.
On Windows, Postgres Pro Standard installations could contain databases with default collations provided by ICU, where the name of the database default collation used a syntactically correct BCP 47 language tag format, but had a wrong language code or other parameters, which invalidated the database default collation name for ICU.
If this issue affects the template0 database, you will get the following error message when trying to initialize the cluster with the same collation: failed to get the canonical name for collation locale. In this case, you can only use dump/restore for upgrade, specifying a valid locale for the selected collation provider.
If this issue affects other databases, you will get the same error message when Postgres Pro tries to create these databases with invalid collation in the new cluster. In this case, you can try the following:
Make a dump of the database using pg_dump; it is required to use
--createand--format=plainoptions.Change the provider for the default collation of the database in the dump file from
'@icu'to'@libc'.In psql, restore the modified dump to complete the upgrade. This operation may fail if any constraints depending on the database collations are violated. In this case, you can try resolving the issues manually.
In some corner cases, using dump/restore could lead to invalid constraints in the restored databases, so you should use pg_upgrade. For example:
If the installation of Postgres Pro Standard 9.6 or lower contained any indexes or constraints depending on collations other than the default collation of the database,
C, orPOSIXin databases with multibyte encodings, indexes and constraints in such databases could become inconsistent when these databases are migrated to Postgres Pro 10 or higher. On Windows, this situation can also happen if the database with a multibyte encoding contained any indexes or constraints depending on the default collation with a verbose name, such as"Russian_Russia[.orencoding]""English_United States[..encoding]"For upgrades from Postgres Pro Standard 10, if the cluster has no information about the ICU library version, the ICU collation versions are checked to ensure that indexes and constraints remain valid after the upgrade. However, for clusters that contain databases with default ICU collations but have no information about the ICU library version and/or its collation versions, it is impossible to check that the current version of Postgres Pro uses the same version of the ICU library.
On Windows, in Postgres Pro Standard 10 clusters with default collations provided by ICU, the ICU collation locale may not match the corresponding
libccollation locale.
If you use pg_upgrade, it declares such indexes and constraints invalid and creates reindex_text_indexes.sql and validate_text_constraints.sql, respectively. You have to run these files to complete the upgrade.
Note
To avoid conflicts on Linux systems, do not use the postgrespro-std-12 package to install the new Postgres Pro binaries. Use the individual packages instead. In this case, server autostart needs to be enabled manually, if required. For details on the available packages, see Chapter 16.
For other upgrade requirements imposed by vanilla PostgreSQL, see Section E.50.