pgbench is a popular tool for testing database performance, but its default 'TPC-B like' workload may not effectively reflect true performance as it could skew results. To overcome this, users can employ custom SQL within pgbench to design a load test that more accurately simulates real-world scenarios and identifies potential bottlenecks. This applies to PostgreSQL and Postgres-compatible databases, including YugabyteDB. Users can create a schema with a simple table and insert data using a script, which can then be run by pgbench with various arguments such as --clients, --job, --transactions, and --report-per-command to test the performance of the database under different conditions. By customizing the script and tuning the arguments, users can gain a better understanding of their database's performance and identify areas for improvement.