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What is write ahead log(journaling)?
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Answer / Vaseem Ahmad
Write Ahead Logging (WAL) or journaling is a database mechanism that ensures data integrity and durability. It works by writing transactions to a log file first and then updating the main database later. If there's an unexpected failure during the write process, the database can be recovered using the log file.nIn Apache Spark, write ahead logging is used in write-ahead logs (WAL) files to ensure that data written by the application is durable and can withstand failures.
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