Why SQL Server RTM Diffs Do Not Match CU Diffs
SQL Server 2025 RTM and CU9 do not have the same system surface. I compared both diffs and counted the changed findings.
Cloud Feature Wait Types in Boxed SQL Server
SQL Server includes wait types named for Synapse Link, Trident, DW, and Parquet. I checked which ones exist and whether they collect counts.
Idle SQL Server Instances Still Accumulate Undocumented Wait Types
I sampled two idle SQL Server instances and found undocumented wait types with non-zero counts. Here is how I keep them visible but out of top waits.
sp_dw_* and the Trident Procedures in SQL Server 2025
SQL Server 2025 adds more sp_dw and Trident system surface, including procedures, wait types, Extended Events, and messages.
sys.dm_hadr_internal_* and the Other Availability Group Additions in SQL Server 2025
SQL Server 2025 adds internal HADR views, documented DMV columns, AG configuration options, wait types, XE events, and messages.
System Objects Removed in SQL Server 2025
I compared SQL Server 2022 CU25 with SQL Server 2025 CU9 and found removed system objects, columns, wait types, XE events and messages.