A nonclustered primary key test shows whether a heap fixes last page insert waits. On SQL Server 2025 it doesn’t, because the key index still rises. A lane layout that spreads the inserts removes the latch wait, and the post shows the cost of that layout.
OPTIMIZE_FOR_SEQUENTIAL_KEY: Test the Last Page Insert Fix
OPTIMIZE_FOR_SEQUENTIAL_KEY is an index option that targets last page insert contention. This post tests it with 32 connections that insert into a clustered identity key, with the option off and on. The option changes the kind of waiting, and the post shows how to decide whether it helps your table.
SQL SERVER – Last Page Insert PAGELATCH_EX Contention Due to Identity Column
Today’s goal is to understand what is the Last Page Insert PAGELATCH_EX Contention Due to Primary Key. Let us start understanding it together.
Recovery Model Insert Test: FULL vs SIMPLE Under Load
A recovery model insert test compares FULL and SIMPLE under a load of 16 connections. The log written is almost the same in both, and the elapsed time depends more on the server than on the model. The real difference is when the log can be reused, and this post shows that step by step.
Insert Workload Waits: WRITELOG and PAGELATCH_EX
Insert workload waits come down to two names, WRITELOG and PAGELATCH_EX. This post runs 16 connections that insert one row at a time and reads their waits with a tested script. It explains what each wait means and where to look for a fix.
SQL SERVER – Resolve WAIT_ON_SYNC_STATISTICS_REFRESH Wait Type
During Comprehensive Database Performance Health Check I recently faced a brand new wait type WAIT_ON_SYNC_STATISTICS_REFRESH.
Session Wait Stats: Find the Query Behind a Wait Type
Session wait stats tell you which session produced a wait type, and the input buffer tells you which query that session ran. This post shows how to see who waits right now, how to read the wait history of each session, and how to join them to the query text. It also explains the THREADPOOL wait.