IGNOU MCS 207 2026 2027 - ) Log-Based Recovery and Checkpointing in Data-Intensive Systems

Question

) Log-Based Recovery and Checkpointing in Data-Intensive Systems

05 Aug 2026

Answer :

Word Count : 688

Log-based recovery is an important technique in Database Management Systems (DBMS) used to maintain database consistency and durability when failures occur. In data-intensive systems, where large volumes of transactions are continuously processed, system failures such as power interruptions, hardware crashes, software errors, or transaction failures can cause data loss or inconsistency. Log-based recovery records information about database changes in a log so that the DBMS can restore the database to a consistent state after a failure. A log is a sequential record of transaction activities maintained on stable storage. Each log record generally contains information such as the transaction identifier, the data item modified, its old value, and its new value. For example, a log record may be represented as ``, indicating that transaction T1 changed data item A from 100 to 150. The log also contains records such as transaction start, commit, and abort. The basic principle

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