DATA READING METHOD AND DEVICE FOR DATABASE, AND STORAGE MEDIUM
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United States of America
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Issued Date -
Mar 6, 2025
app pub date -
Jul 30, 2024
filing date -
Jul 30, 2024
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Abstract
The present disclosure provides a data reading method and device for a database and storage medium, which includes: receiving a query condition for a Value column in an LSM-Tree database; querying first alternative data with Value meeting the query condition from the LSM-Tree database; constructing a right table according to Key of the first alternative data, taking total data in the LSM-Tree database as a left table, and carrying out Semi Join based on the left table and the right table, so as to acquire second alternative data matched with each Key of the right table from the left table; querying target data with Value meeting the query condition from the second alternative data. The present disclosure can realize a predicate pushdown function of an LSM-Tree database in Merge-On-Read scene, in which, a large amount of data scanning is avoided while write performance and query performance are balanced.
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