Method and device for database cluster expansion

Abstract

The invention discloses a capacity expansion method for a database cluster, and relates to the technical field of computers. One specific implementation way of the method comprises the following steps that: according to a received capacity expansion request of the database cluster, creating a triple task; and executing the triple task to finish the capacity expansion of the database cluster. By use of the implementation way, through the received capacity expansion request, the triple task is created to finish the capacity expansion of the database cluster, a user does not need to carry out additional control on the capacity expansion, the capacity expansion request of the cluster can be directly submitted to achieve an effect of the automatic capacity expansion of the database cluster, and the method has the performance of being compatible with cascade connection capacity expansion or other complex capacity expansion.

Description

technical field [0001] The invention relates to the field of computer technology, in particular to a method and device for expanding the capacity of a database cluster. Background technique [0002] A database cluster uses at least two or more database servers to form a virtual single database logical image, and provides transparent data services to clients like a single database system. In practical applications, existing database clusters often fail to meet business needs. In this case, it is necessary to add new database instances to the existing cluster, that is, to expand the capacity of the database cluster. [0003] When expanding the capacity of a database cluster in the prior art, all expansion operations in which the target instance in a cluster is the same data source instance are usually submitted as one task for execution. The mounted master database instance of the target instance can be the same database instance or a different database instance. If multiple...

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Problems solved by technology

[0004] In the process of realizing the present invention, the inventors have found that there are at least the following problems in the method for expanding the capacity of the database cluster in the prior art: 1. When using the existing technology to expand the capacity of the database cluster, all expansion situations need to be considered, which on the one hand causes the design to be complicated, and on the other hand On the one hand, with business upgrades, when new expansion tasks are added, it is very difficult to upgrade the code in the previous overall design; second, using existing technologies to expand the database cluster, if a step in the expansion task fails to execute, it cannot directly Recovering from the execution of wrong steps, resulting in the failure of the entire expansion task; 3. The existing technology does not support cascading expansion or other complex expansion

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