使用linq从Azure DB查询需要很多时间

Question

I am using Azure db and my table has over 120000 records. Applied with paging of 10 records a page I am fetching data into IQueryable, but fetching 10 records only taking around 2 minutes. This query has no join and just 2 filters. While using Azure search I can get all the records within 3 seconds. Please suggest me who to minimise my Linq search as azure search is costly.

Answer 1

Based on the query in the comment to your question, it looks like you are reading the entire db table to the memory of your app. The data is potentially transferred from one side of the data centre to another, thus causing the performance issue.

unitofwork.Repository<EntityName().GetQueriable().ToList().Skip(1).Take(10);

Without seeing the rest of the code, I'm just guessing your LINQ query should be something like this:

unitofwork.Repository<EntityName().GetQueriable().Skip(1).Take(10).ToList();

Skip and Take should be executed on the db Server, while .ToList() is at the end will materialize the entities.