omni_txn

Overview

Version

Build

You can build the RPM / DEB packages for omnigres using pig build:

pig build pkg omnigres         # build RPM / DEB packages

Install

You can install omnigres directly. First, make sure the PGDG and PIGSTY repositories are added and enabled:

pig repo add pgsql -u          # Add repo and update cache

Install the extension using pig or apt/yum/dnf:

pig install omnigres;          # Install for current active PG version

pig ext install -y omnigres -v 18  # PG 18
pig ext install -y omnigres -v 17  # PG 17
pig ext install -y omnigres -v 16  # PG 16
pig ext install -y omnigres -v 15  # PG 15
pig ext install -y omnigres -v 14  # PG 14

dnf install -y omnigres_18       # PG 18
dnf install -y omnigres_17       # PG 17
dnf install -y omnigres_16       # PG 16
dnf install -y omnigres_15       # PG 15
dnf install -y omnigres_14       # PG 14

apt install -y postgresql-18-omnigres   # PG 18
apt install -y postgresql-17-omnigres   # PG 17
apt install -y postgresql-16-omnigres   # PG 16
apt install -y postgresql-15-omnigres   # PG 15
apt install -y postgresql-14-omnigres   # PG 14

Create Extension:

CREATE EXTENSION omni_txn;

Usage

omni_txn: Transaction management

The omni_txn extension provides transaction linearization for stronger consistency guarantees beyond standard PostgreSQL isolation levels.

Enable Linearization

BEGIN TRANSACTION ISOLATION LEVEL SERIALIZABLE;
SELECT omni_txn.linearize();
-- Perform operations; conflicts raise serialization errors
COMMIT;

Check Linearization Status

SELECT omni_txn.linearized();  -- returns boolean

Behavior

Linearizability ensures every operation appears to take place atomically in an order consistent with real-time ordering. The extension intercepts mutating statements (INSERT, UPDATE, DELETE, MERGE) and enforces:

• Write-after-read conflict detection across serializable linearized transactions
• Commit-after-read conflict detection
• Snapshot conflict detection

Raises serialization error exceptions when conflicts are detected. False positives are possible; use with retry mechanisms (compatible with omni_txn.retry).