Weba covering index is the one which gives every required column and in which SQL server don't have hop back to the clustered index to find any column. This is … Webv. cov·ered, cov·er·ing, cov·ers. v.tr. 1. a. To place something upon or over, so as to protect or conceal: covered the boat with a tarp; covered the photo with his hand. b. To overlay …
How to optimize a count query - Working with Data - MongoDB
WebSep 14, 2024 · Covered queries. A subset of query optimizations, called “covered queries”, is characterized by their return results. In MongoDB, a query for which the return results contain only indexed fields is returned without any reading from the source documents. “Covered queries” are a mixed blessing, as far as features go. WebMar 5, 2024 · Specifically, a covered query is a query in which: All the fields in the query are part of an index. All the fields returned in the query are in the same index. Behind the scenes, MongoDB matches the query conditions and returns the result using the same index without actually looking inside the documents. paint sprayer magnum x5
SeaQL/sea-query - Github
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