ChronicDB

ChronicDB is the only live database update system.

ChronicDB is an innovative technology that applies dynamic database upgrades with zero database downtime and zero data inconsistencies.

ChronicDB can relocate databases on the fly, reorganize database schemas (partition, merge, relocate, rename, and generally update fields and tables, both horizontally and vertically), reverse schema changes, and preserve execution of unmodified legacy database applications alongside their new version, all without bringing either the database or the database application down.

ChronicDB provides a virtualized environment that guards your data from unnecessary expansion and simplifies the change management process.

What is new in this release:

• This release offers vertical table merging and vertical table splitting.

What is new in version 3.2.8:

• This release applies checkpoints of incrementally merged changes more efficiently.

What is new in version 3.2.3:

• This release changes the internal naming of tables and procedures created by ChronicDB.

What is new in version 3.2.1:

• This release protects target replica databases from manual data modifications.

What is new in version 3.1.1:

• This release removes unnecessary packaging dependencies.

What is new in version 3.0.3:

• Database replication is important for implementing hot-standby failover and for offloading parts of an organization's workflow, such as Extract-Transfer-Load (ETL) reporting, into an offline read-only database copy. With ChronicDB a simplified, highly automated replication system can be deployed without requiring a database administrator to read a 50+ page manual. Replication follows an asynchronous master/slave model, which is the most frequently requested model by organizations running mission-critical databases.
• This technology is available for the first time for PostgreSQL. It is offered on Linux with plans to support other database and operating systems. ChronicDB is one of the easiest replication systems to administer that have ever been offered for PostgreSQL, with a FREE version available.
• Complementing replication is the unique ability of ChronicDB to evolve a database schema or relocate a database while the database is actively used, without downtime, which has never been offered before by any software vendor. Live database relocation and live schema evolution are accomplished through sophisticated query rewritting and live connection migration.
• With these capabilities ChronicDB allows multiple versions of database applications to execute concurrently and indefinitely against the same copy of the database. An end goal of ChronicDB is to offer semantically consistent version control for live databases, such as applying forward schema changes and efficiently reversing the changes if a defect is discovered in the application.

What is new in version 2.9.2:

• New features:
• Added the ability of applying vertical merging operations when restructuring tables.