E.1. Release Notes for Tantor SE-1C 18.3.0#

E.1. Release Notes for Tantor SE-1C 18.3.0
E.1. Release Notes for Tantor SE-1C 18.3.0
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E.1. Release Notes for Tantor SE-1C 18.3.0 #

E.1.1. Review
E.1.2. DBMS Core Functionality
E.1.3. Additional Supplied Modules
E.1.4. Installation and update changes
E.1.5. Operating System Support
E.1.6. Supported Operating Systems
E.1.7. Migration to version 18.3.0

Release date: 2026-06-15

E.1.1. Review #

Tantor SE-1C is a Russian-made DBMS based on the updated and improved version of the PostgreSQL DBMS. Tantor SE-1C 18.3.0 is based on PostgreSQL 18.

Below are the additional modules and utilities added to Tantor SE-1C, as well as a list of changes to the server core.

E.1.2. DBMS Core Functionality #

The following changes have been made to improve the DBMS:

  • Implemented logical replication between DBMS clusters using 32-bit and 64-bit transaction identifiers.

  • The tuples_fetched parameter has been added to the output of the EXPLAIN command, which allows you to evaluate the efficiency of using the index.

  • The output of the EXPLAIN command adds additional statistics on the usage of the Memoize node.

  • Added the ability to scan temporary tables in parallel using the extended_parallel_processing and write_page_cost parameters.

  • The verification of the IN operator condition when working with MCV histograms has been optimized.

  • Added the ability to use Compression Storage Manager (CSM) with database pages at the storage manager level Tantor SE-1C.

  • Added the ability to start WAL receiver earlier on the standby server using the wal_receiver_start_at parameter, which reduces unnecessary delays when resuming streaming replication after a replay backlog.

  • Added the ability to partially perform aggregation before joining tables, followed by finalizing after the connection is completed using the enable_eager_aggregate parameter. This allows you to reduce the amount of data processed and choose a more efficient execution plan.

  • Fixed a bug that causes local buffers to run out when working with temporary tables with high effective_io_concurrency values.

  • An optimization has been implemented that allows you to move semi-connections inside the query connection tree. This allows you to reduce the amount of data processed and choose a more efficient execution plan.

  • Implemented a check that warns about the simultaneous use of incompatible parameters extended_parallel_processing and enable_temp_memory_catalog.

  • The possibility of choosing a cardinality estimation model is implemented. There are 2 models available to choose from: Fully independent and Partially correlated.

  • Added support for CREATE TEMP TABLE ... ON COMMIT DROP for temporary tables when using stored in-memory temporary catalog.

Caution

The value of the jit parameter has been changed to off by default.

E.1.3. Additional Supplied Modules #

pgaudit:

  • Implemented monitoring of user activity outside the whitelist of whitelist_role with event logging.

  • For users from the whitelist_role whitelist, the option has been added not to audit operations in temporary schemas.

The transp_anon implements data anonymization has been implemented at the table access method level, which allows you to cover all possible workarounds. Improved performance.

Added extensions:

pg_csm — provides a diagnostic estimation of compressibility of tables and indexes that use the Compression Storage Manager.

Updated extensions:

Removed extensions:

The pg_uuidv7 extension has been removed from contrib for Tantor SE-1C 18 and later, because UUIDv7 generation is now supported by PostgreSQL core. The UUIDv7 generation function remains available under the same name: 

uuidv7()

E.1.4. Installation and update changes #

Link-Time Optimization (LTO) is enabled for release builds.

E.1.5. Operating System Support #

Added build support for OS Altlinux p11 and Debian 13 Trixie.

Discontinued build support for OS Debian 10 Buster and Ubuntu 20.

E.1.6. Supported Operating Systems #

The list of supported operating systems (OS) has been expanded. The full list is provided below:

  • Altlinux c9f2 (P8)

  • Altlinux p10

  • Altlinux p11

  • Astra Linux Special Edition 1.7

  • Astra Linux Special Edition 1.8

  • Astra Linux Special Edition 4.7

  • Debian 11 Bullseye

  • Debian 12 Bookworm

  • Debian 13 Trixie

  • MSVSphere

  • Oracle Linux 8

  • Redos 7.3

  • Redos 8

  • Rocky 8

  • Rocky 9

  • Ubuntu 22

DBMS builds are created and tested for these operating systems on an ongoing basis.

Other x86-64 architecture operating systems are supported on request.

E.1.7. Migration to version 18.3.0 #

To migrate from PostgreSQL or Tantor DB, first install the latest minor version and then perform a data offload/restore by applying pg_dumpall, or use the pg_upgrade utility.

Caution

Starting with PostgreSQL 18, clusters initialized with initdb have data page checksums enabled by default. This may affect upgrades from clusters created without checksums: pg_upgrade requires the old and new clusters to use the same checksum setting. If you upgrade to version 18.3.0 using pg_upgrade from a non-checksum-enabled cluster, initialize the new cluster with initdb --no-data-checksums, or enable checksums in the old cluster before running pg_upgrade.

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