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Method, device and system for accessing database after downtime

An access method and database technology, applied in the field of access methods, devices and systems after database downtime, can solve problems such as application impact, long recovery time, and instance unavailability during recovery, and achieve the effect of improving access efficiency

Active Publication Date: 2019-01-25
ALIBABA GRP HLDG LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] From the above explanation, we can find a problem that the instance is unavailable during the recovery period. When there is a lot of data to be recovered, the recovery time may be very long, resulting in a greater impact on the application

Method used

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  • Method, device and system for accessing database after downtime
  • Method, device and system for accessing database after downtime
  • Method, device and system for accessing database after downtime

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Embodiment Construction

[0061] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described The embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0062] In order to facilitate understanding of the embodiments of the present application, several elements that will be introduced in the description of the embodiments of the present application are firstly introduced here.

[0063]ACID: Four basic elements for the correct execution of database transactions, including Atomicity, Consist...

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Abstract

The embodiment of the application discloses a database access method and a database access device after a database downtime. The method comprises the following steps: acquiring a read operation request of a user in a recovery process of a database system; determining information of at least one storage unit corresponding to log data corresponding to data related to the read operation request in the database system; if the at least one storage unit does not include an uncured storage unit in the database system, executing the read operation request and returning the execution result.

Description

technical field [0001] The present application relates to the field of databases, in particular to a method, device and system for accessing a database after a downtime. Background technique [0002] In order to ensure the reliability and consistency of data, the database generally adopts the method of writing the data operation log first and then writing the data. Data operation logs are written sequentially, and will be prioritized over data flushing. Therefore, when the database goes down unexpectedly, even if the data in the database is inconsistent, the purpose of data recovery can be achieved by redoing the logs after a certain point in time. [0003] From the above explanation, we can find a problem that the instance is unavailable during the recovery period. When there is a lot of data to be recovered, the recovery time may be very long, resulting in a great impact on the application. What it affects is only a part of the data in the entire database system, that is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F11/14
CPCG06F11/1471G06F11/1474G06F2201/80
Inventor 窦贤明张广舟周正中
Owner ALIBABA GRP HLDG LTD