Enhance performance of select query

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SQL-Server-2012

I have a SQL database table in which records keep growing every sec when I perform a select statement on the table it takes ~1.5 minutes to retrieve the data with around 380000 records in the table. There are no indexes on the table, I know this is one of the reasons why the data retrieval is slow.
Considering the table grows every sec, what kind of indexes should I apply on the columns and non of the columns on the table are unique and so there is no PRIMARY KEYS.

I have 5 columns that I use in the where condition to retrieve the desired result from the select.

What I have tried:

Need some input before I try something out.

Posted 8-Mar-20 4:10am

tirumalabalaji

Updated 8-Mar-20 5:05am

v2

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RickZeeland · Answer 1 · 2020-03-08T05:05:00

You can use the "Execution plan" feature to test if different options make a difference:
SQL Server Query Execution Plans in SQL Server Management Studio[^]

Also see: free-tools-for-sql-server[^]

Primary keys are really a must, if there is no suitable column you can make one using IDENTITY, see info here: Create Primary Keys - SQL Server | Microsoft Docs[^]