Big load when working with the database

I wrote a class for working with a database from SQL, however, in the course of work, a child process is created from SQL, which loads the processor by 20% and consumes 170 MB of RAM even in idle time.

What's wrong?

static class SQL { public class State { public State(string name, string lastMessage, int messageCount, int messageLetterCount) { this.name = name; this.lastMessage = lastMessage; this.messageCount = messageCount; this.messageLetterCount = messageLetterCount; } public string name, lastMessage; public int messageCount, messageLetterCount; } static string connectionString = @"Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename=C:\My Documents\Visual Studio 2017\Project\ARRA_bot_GUI\ARRA_bot_GUI\MessageDatabase.mdf;Integrated Security=True"; public static async Task Insert(string name, string message, string channel) { using (var sqlConnection = new SqlConnection(connectionString)) { await sqlConnection.OpenAsync(); if (!await IsCreatedTable(channel)) await createTeble(channel); int messageCountNew = 0, messageCountLetterNew = 0; SqlCommand command = new SqlCommand($@"update [{channel.ToLower()}] set [LastMessage] = @LastMessage, [MessageCount] = @MessageCount, [MessageLetterCount] = @MessageLetterCount where [Name] = @Name; if @@rowcount = 0 insert into [{channel.ToLower()}] (Name, LastMessage, MessageCount, MessageLetterCount) values (@Name, @LastMessage, @MessageCount, @MessageLetterCount);", sqlConnection); State state = await getState(name, channel); if (state != null) { messageCountNew += state.messageCount; messageCountLetterNew += state.messageLetterCount; } command.Parameters.AddWithValue("Name", name.ToLower()); command.Parameters.AddWithValue("LastMessage", message); command.Parameters.AddWithValue("MessageCount", messageCountNew + 1); command.Parameters.AddWithValue("MessageLetterCount", messageCountLetterNew + message.Length); await command.ExecuteNonQueryAsync(); } } public static async Task<State> getState(string name, string channel) { using (var sqlConnection = new SqlConnection(connectionString)) { await sqlConnection.OpenAsync(); if (!await IsCreatedTable(channel)) return null; SqlCommand command = new SqlCommand($"SELECT * FROM [{channel.ToLower()}] WHERE [Name] = @Name", sqlConnection); command.Parameters.AddWithValue("Name", name.ToLower()); using (SqlDataReader dataReader = await command.ExecuteReaderAsync()) { State state = null; try { dataReader.Read(); state = new State(name, Convert.ToString(dataReader["LastMessage"]), Convert.ToInt32(dataReader["MessageCount"]), Convert.ToInt32(dataReader["MessageLetterCount"])); } catch (Exception) { } return state; } } } private static async Task<bool> IsCreatedTable(string name) { using (var sqlConnection = new SqlConnection(connectionString)) { await sqlConnection.OpenAsync(); SqlCommand command = new SqlCommand($"SELECT count(*)FROM information_schema.TABLES WHERE (TABLE_NAME = '{name.ToLower()}')", sqlConnection); var result = await command.ExecuteScalarAsync(); return (int)result == 1; } } private static async Task createTeble(string channel) { using (var sqlConnection = new SqlConnection(connectionString)) { await sqlConnection.OpenAsync(); SqlCommand command = new SqlCommand($@"CREATE TABLE [dbo].[{channel.ToLower()}] ([Name] NVARCHAR(50) NOT NULL, [LastMessage] NVARCHAR(MAX) NOT NULL, [MessageCount] INT NOT NULL, [MessageLetterCount] INT NOT NULL)", sqlConnection); await command.ExecuteNonQueryAsync(); } } } 

If anything, I appeal to him like this:

 SQL.Insert(q, w, e).GetAwaiter(); SQL.getState(q, w).Result;