Tag: Performance
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How to improve mysql performance using CACHING
Before diving into a deep performance investigation — wait stats, execution plans, I/O benchmarks — it’s worth checking whether a simple configuration oversight is behind the problem. One of the most common and highest-impact quick wins in MySQL is query cache sizing. A cache that’s disabled, too small, or incorrectly sized can account for a…
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Anayze SQL default trace to investigate instance events
SQL Server runs a lightweight background trace called the default trace that records a wide range of server-level events: database auto-growth events, object creation and deletion, login failures, server configuration changes, and more. It’s often the first place to look when investigating an incident that didn’t make it into the error log. This article shows…
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How to make your databases smaller and faster: find unused indexes
Indexes are one of the most powerful performance tools in SQL Server — and one of the most overlooked sources of overhead. Every index you create must be maintained on every INSERT, UPDATE, and DELETE operation. Unused indexes cost you disk space, backup time, memory, and write performance, without providing any read benefit. Finding and…
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Queries to see rapidly what your SQL Server is doing NOW
When troubleshooting performance issues on a SQL Server instance, the first step is always to understand what is happening right now: which queries are running, which sessions are blocking others, and where time is being spent waiting. These three T-SQL scripts give you an immediate picture of the current workload using Dynamic Management Views (DMVs).…