Method and device for accessing survey point of cluster database

Abstract

The invention discloses a method and a device for accessing a survey point of a cluster database, which are applied to a Treap tree established in memory. A node memory index block of the Treap comprises the survey point identification range and access times; the node access times are sequentially reduced according to a preset node searching sequence; and preset number index blocks read from a disk is saved in the memory according to the high-low sequence of the access times. The method comprises the following steps: receiving a survey point access request in a preset cycle; searching a target node from a tree according to the target survey point identification and a preset node searching sequence in the request; increasing the access times of the target node; searching whether an index block corresponding to the target node exists in the memory or not, and determining the location of the survey point corresponding to the target survey point identification in the index block if the index block exists; accessing the survey point according to the survey point location; regulating the position of the target node in the Treap tree after the preset cycle is finished to sequentially reduce the access times of each node according to the node searching sequence.

Description

technical field [0001] The present application relates to the technical field of databases, in particular to a method and device for accessing measurement points of cluster databases. Background technique [0002] Cluster database, which has become the basic core software system in the process of industrial informatization, is a logically unified database system composed of a large number of stand-alone databases. Among them, the stand-alone database contains multiple measurement points, and the user can access the cluster database by accessing the measurement points. The cluster database provides users with a unified access interface, and realizes the transparency of the storage location of the measurement points to the access interface. That is to say, the user does not need to care about the storage location of the measurement point, but only sends a measurement point access request to the access interface, and the interface searches for the specific storage location of ...

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Problems solved by technology

[0005] In view of this, the present invention provides a cluster database measuring point access method and device to solve the problem in the prior art that when searching for measuring points using the index of the above-mentioned B+ tree structure, the number of accesses to the hard disk is large, resulting in low efficiency of measuring point search question

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