PostgreSQL 10 New Features

2017-04-16 ·

Logical replication

Logical replication allows table-level granularity, from multiple clusters to single cluster, of a single table to multiple clusters, it can be used between major PostgreSQL versions. It can create local objects on subscribers e.g. table indexes.

Partitioning

Partitioning is a simpler version of table inheritance: the parent table is always empty while child tables (partitions) have implicit constraints defined. Those contrains determine which partition will have a tuple added when this is inserted into the parent.

CREATE TABLE numbers (x INTEGER) PARTITION BY RANGE (x);
CREATE TABLE negatives PARTITION OF numbers FOR VALUES FROM (UNBOUNDED) TO (0);
CREATE TABLE positives PARTITION OF numbers FOR VALUES FROM (0) TO (UNBOUNDED)
INSERT INTO numbers VALUES (-3), (-1), (9), (99);
SELECT * FROM numbers;
x
----
-3
-1
9
99
SELECT * FROM negatives;
x
----
-3
-1
SELECT * FROM positives;
x
----
9
99

Partitioning creates child constrains accordingly and it routes parent INSERT into child tables. As of time of writing, partitioning doesn't create tables for non-covered values and there is no hash partitioning. It doesn't also move rows that were updated and no longer match the partition constrains.

Hash Index

PostgreSQL 10 will make Hash Index a first-class feature being crash-safe, replicated with reduced locking during bucket splits and faster lookups, index growth will be more even and there will be possibility to do single-page pruning.

ICU Library

PostgreSQL 10 will use ICU library providing Unicode and Globalization support for software applications instead of OS-supplied.

Quorum Commit

PostgreSQL 10 will provide quorum set of synchronous standbys also known as quorum commit.

Parallelism

PostgreSQL 10 will support parallelism in btree index scans and in bitmap heap scans, in merge joins and in procedural languages.

Mult-column statistics

PostgreSQL 10 will provide multi-column statistics with CREATE STATISTICS ... WITH

Improved pg_stat_activity

PostgreSQL 10 improves pg_stat_activity with additional wait tracking for client reads/writes, server reads/writes/fsynsc, and synchronous replication. It additionally displays auxiliary, worker and WAL processes.

Stronger Password Hashing

PostgreSQL 10 will use SCRAM-SHA-256 instead of MD5 for more secure password authentication.

Full text search for json and jsonb

PostgreSQL 10 will support full text search for json and jsonb columns.

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