Resource recovery is a configurable option that provides object persistence and recovery operations. Basic persistence is achieved by writing transactions to a transaction log that contains all the information necessary to re-create the transaction. Persistence is supported for the CosTransactions::Resource and CosTransactions::Synchronization objects. Recovery is supported for JDBC connectors and native type resources that are registered with EAServer. When EAServer starts, the recovery manager is called, which reads the transaction log and starts transaction recovery.
Recovery
operations can be performed only for transaction logs that were
created for EAServer version 5.0 or later.
A transaction log provides enhanced debugging and integrates with the standard EAServer logging functionality. Monitoring functionality is also provided, which allows you to use EAServer Manager to view statistics, such as the total number of transactions, currently active transactions, average duration of transactions, failed transactions, and remotely started transactions.
When EAServer starts, the TransactionLogManager verifies the transaction log’s integrity, automatically does necessary repairs, then runs the transaction log defragmenter. This helps to allocate space for new transactions. The recovery manager passes transaction information to the TransactionLogManager, which is responsible for storing and deleting the transaction record from the transaction log.
