C# entityframework 核心抛出 Timeout expired。 操作完成前超时时间已过或服务器无响应

Question

I am using the following linq query using EF core. and getting the following error:

Timeout expired.  The timeout period elapsed prior to completion of the operation or the server is not responding.

Not sure what am i doing wrong here.

ECUserId is varchar column and there is no index set on this table for this column. Also checked the collation and it is set to 'SQL_Latin1_General_CP1_CI_AS' which is case sensitive.

string ECUserId = "TN504060"
var userStandby = await _context.UserStandby
                                .Where(standBy => ECUserId.Equals(standBy.ECUserId, 
                                       StringComparison.OrdinalIgnoreCase))
                                .FirstOrDefaultAsync();

The userStandby table has got around 126580 records.

Can anyone help me how to fix the above timeout error?

Created an index on this column but still getting the same timeout error:

GO
CREATE NONCLUSTERED INDEX [IX_UserStandby_ECUserId]
    ON [dbo].[UserStandby]([ECUserId] ASC);

The linq query is not generating the sql query with where condition. What am i doing wron here please?

thanks

Answer 1

You can set a longer timeout when setting up your DbContext:

        services.AddDbContext<MyDbContext>(config =>
          config.UseSqlServer(
             "MyConnectionString",
             providerOptions =>
             {
                 providerOptions.CommandTimeout(180); <-- Timeout in seconds
             })
        );