Check point processing method and device, electronic equipment and storage medium

Abstract

The present application provides a checkpoint processing method and device, an electronic device, and a storage medium, wherein the method includes: determining the minimum value of the dirty page flags of the target dirty page included in the target dirty page linked list as the target checkpoint The first reference value of , the target dirty page is the dirty page of the target database, and the dirty page mark is the log sequence number of the redo log updated for the first time by the dirty page; the difference between the first reference value and the first predetermined value , is determined as the second reference value of the target checkpoint; the target mark is found from the dirty page mark of at least one historical dirty page, and the log sequence number of the target checkpoint is obtained, and each historical dirty page in at least one historical dirty page is For dirty pages in the target database that have been flushed to disk, the target mark is less than or equal to the second reference value. This application solves the problem of difficulty in upgrading the database version due to incompatibility with the checkpoint records of existing redo logs in the method of concurrently adding dirty pages in the related art.

Description

technical field [0001] The present application relates to the field of data processing, and in particular to a method and device for processing checkpoints, electronic equipment and storage media. Background technique [0002] At present, after the database incremental log (redo log, redo log) is lock-free optimized, the incremental log copies data from the memory area of ​​the user thread to the log public buffer area (log buffer), and can be executed concurrently to add dirty pages to dirty pages In the linked list (flush_list), there can be one or more dirty page linked lists (flush_list). When performing dirty cleaning, the dirty pages in the dirty page linked list can be flushed to the disk in order of oldest_modification from small to large, where oldest_modification is used to represent the LSN (Log Sequence Number, log sequence number). [0003] Since adding dirty pages to the dirty page list is performed concurrently, during a dirty page cleaning process, the LSNs...

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Problems solved by technology

[0007] The present application provides a checkpoint processing method and device, electronic equipment, and a storage medium, to at least solve the problem of concurrently adding dirty pages in the related art due to incompatibility with checkpoint records of existing versions of redo logs The problem of difficult version upgrade

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