SynapseSqlPoolExecRequests:

This log contains detailed information about queries executed in a dedicated SQL pool in Azure Synapse Analytics.

It provides metrics such as query duration, CPU time, I/O, and the status of the queries, making it the best choice for monitoring query performance.

Other options:

A. SynapseSqlPoolSqlRequests:

Logs high-level requests, such as login attempts or connection establishment. It doesn’t give detailed query execution information.

C. SynapseSqlPoolWaits:

Contains information about waits in the SQL pool, useful for troubleshooting resource contention but not suitable for directly monitoring query performance.

D. SynapseSqlPoolRequestSteps:

Provides information about the individual steps within a query plan, which is more granular and not typically used for general query performance monitoring.

Data Factory stores pipeline-run data for only 45 days. Use Azure Monitor if you want to keep that data for a longer time.