What file format is created during checkpointing with Appian engines?

During the checkpointing process with Appian engines, a file format known as "kdb" is created. This format is specifically designed to store the state and data of the engine at a specific point in time. Checkpointing is a critical mechanism for ensuring data persistence and recovery in case of failures or crashes. The kdb format allows Appian to efficiently manage and retrieve data while maintaining the integrity of workflows and processes.

This particular format is optimized for the internal workings of Appian engines, providing performance advantages in serialization and deserialization under high-load conditions. It facilitates quicker recovery and minimal downtime, which are essential in enterprise-grade applications where continuous operation and data integrity are paramount.

Other file formats like xml, json, and txt serve different purposes in data representation and transport but are not utilized in the context of checkpointing within Appian engines. These formats might be used for configuration files, data interchange, or logs, but they do not fulfill the specific technical requirements of saving and managing engine state during checkpointing.