Concurrent Problem For Help

Hi, I have some problem when using dotnet Core 2.2 + Dapper to construct a Project.

Problem1： In the beginning of the month, a huge number of requests coming into our program (mostly simple QUERY, some flexible QUERY ——about 20-40second, and a little INSERT or UPDATE), and MySQL's perform becoming pool, and soon causing error like "too many connections". I don't understand what may cause these problems. Too High Concurrent request? or these slow SQL. My Code like this：
public IDbConnection GetDbConnection(){ Dapper.DefaultTypeMap.MatchNamesWithUnderscores = true; var connectStr = "Database=xxx;Data Source=xxx;pooling=false;port=3306;Password=xxxx;"; return new MySqlConnection(connectStr) }
with usage:
string strQuerySql = "select * from blablabla where xxx = xxx"; using(var connection = GetReadDbConnection()){ var listData = connection.Query<xxxModel>(strQuerySql).ToList(); }
is there anything wrong?
Problem2：If I wanna using connection pool, I just need to modify my connectStr like this:
var connectStr = "Database=xxx;Data Source=xxx;pooling=true;port=3306;Password=xxxx;min pool size = 10;max pool size = 150;";
is that Right?
Expecting your reply ! Thank you so much.

The issue provides a C# connection factory, a MySQL connection string, and a Dapper query example, but names no repository files or tests. Start by reviewing the reported connection-pooling configuration and reproducing the high-concurrency behavior; done would require a clear diagnosis and an agreed project change, neither of which is specified here.