Method and system for implementing from asynchronous copy to synchronous copy by data

Abstract

The invention discloses a method for converting an asynchronous copy of data to a synchronous copy and a system, the method mainly comprises the following steps: receiving requirements of the asynchronous copy by an asynchronous copy unit of a standby node, transmitting requests of the asynchronous copy to the asynchronous copy unit of a source node, submitting a journal to the standby node by the source node, judging the submitted journal of the standby node in real time and judging whether the deviation of the asynchronous copy journal which is synchronized to the standby node satisfies theappointed range of the system, if the deviation satisfies the range, receiving the synchronous copy requirements by the synchronous copy unit of the standby node, applying for carrying out the synchronous copy to the synchronous copy unit of a main node, otherwise, continuously submitting the synchronized journal to the standby node, and starting the synchronous copy by the main node, memorizing the synchronized journal to a journal chasing buffering area in a buffering mode. The invention speeds up the data synchronization of the standby node and the main node, reduces the interactive processes of the main and the standby nodes, greatly reduces the bearing of the main node and maintains the reliability of the system.

Description

technical field [0001] The invention relates to the field of database systems, in particular to the replication of data between multiple databases, in particular to a conversion method and system from asynchronous replication to synchronous replication of data. Background technique [0002] At present, in order to improve the reliability of the database system, redundant backup is usually used, that is, to run two or more database nodes containing the same content at the same time to improve the system's ability to resist risks, so that data replication within multiple nodes It is the prerequisite for the reliable operation of the whole system. [0003] Generally speaking, data replication can be divided into synchronous and asynchronous. Synchronous replication ensures that the data of each node is completely consistent, while asynchronous replication allows certain content deviations between the standby node and the active node. Due to abnormal conditions, nodes that usua...

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Problems solved by technology

[0006] The object of the present invention is to propose a conversion method and system from asynchronous replication to synchronous replication of data, which is used to solve the problem of excessive interaction and complicated process in the process of conversion from asynchronous replication to synchronous replication of data between databases in the prior art Problems that greatly reduce system reliability

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