Data deletion method and system

Abstract

The invention relates to the field of data processing, and discloses a data deletion method, which combines the use times and storage time of data information to implement a double deletion strategy. When the disk space is less than the threshold, priority is given to deleting the data whose use times are 0 within the range of the non-current time period. The data information is circulated in this way, if the disk space is still insufficient, then delete the data information with the lowest frequency of use, that is, the data information with the largest ratio of storage time to the number of times of use; Deletion applications are deployed separately to prevent database operations from increasing the load on the server where the application is automatically deleted. The data deletion method of the present invention adopts multiple deletion strategies, which effectively reduces the rate of misdeletion of useful information and the rate of omission of useless information. At the same time, it adopts a dual-server division of labor and cooperation mode to reduce the load on the server where the automatic deletion application program is located, and improve the deletion efficiency. .

Description

technical field [0001] The invention relates to the field of data processing, in particular to a data deletion method and system. Background technique [0002] Large medical equipment will generate a large number of data files during use, and storing these data files requires a large disk space. Taking PET systems as an example, the raw data acquired by PET scanners are photon events produced by the annihilation of positrons and negatrons acquired by a series of detectors. Typically, a PET scan can generate data volumes up to several million events, and storing these data takes up a lot of disk space. If the disk cannot be cleaned up in time, when the next scan is performed, the scan may fail due to insufficient disk space. [0003] In the prior art, the method of automatically deleting data is rarely used in large-scale medical equipment, and the deletion strategy is relatively rough. For imaging equipment, the database and the deletion application are deployed on the sam...

AI Technical Summary

Problems solved by technology

If the disk cannot be cleaned up in time, when the next scan is performed, the scan may fail due to insufficient disk space

[0003] In the prior art, the method of automatically deleting data is rarely used in large-scale medical equipment, and the deletion strategy is relatively rough. For imaging equipment, the database and the deletion application are deployed on the same end, and frequent operations of the database lead to an increase in deletion. The load of the server where the application is located, and the deletion strategy is that when the disk space reaches the threshold, delete the earliest imported file according to the order of the file import time recorded in the local database. The above deletion strategy is applied to medical equipment, which may easily lead to accidental deletion. Files with a high usage rate, and files with a late import time but a usage rate close to 0 are missed and deleted. Therefore, the data deletion method in the prior art cannot be well applied to large-scale medical equipment, and cannot be used for medical image files. make strategic trade-offs

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