Rapid Recovery Capability

After a server crash, quick recovery of services is crucial. WAL technology can significantly shorten system recovery time. Since the log files record all unfinished transaction information, the system can restore to its pre-crash state by re-executing these transactions in the order of the log files upon restart. Compared to traditional recovery methods, such as performing a comprehensive scan and repair of the entire database, WAL technology greatly reduces the time and computational resources required for recovery, allowing the system to resume operation more quickly and minimizing the impact of downtime on business. For example, in a large enterprise database system, after adopting WAL technology, the recovery time after a server crash has been reduced from several hours to just a few minutes or even shorter, greatly improving business continuity.

Support for Transaction Processing

In modern database systems, transaction processing is an important means of ensuring data consistency. A transaction may contain multiple data operations, which must either all be successfully executed or not executed at all. WAL technology is closely integrated with transaction processing, providing strong guarantees for the atomicity and durability of transactions. During the execution of a transaction, the system records each operation of the transaction in the log file, and only when all operations of the transaction are successfully completed and written to disk, will the transaction be marked as completed in the log file. If the server crashes during the execution of a transaction, the system can determine from the log file which transactions have been completed and which have not, rolling back any unfinished transactions to ensure data consistency. This is similar to a bank transfer process, where any issues during the transfer can ensure that funds are accurately transferred or returned to their original state, preventing loss or confusion of funds. @Walrus 🦭/acc #walrus $WAL