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The Disk Latency chart plots the average time (in milliseconds) required to complete disk reads and writes, tracking the disk IO speed over time.
Metric | Why it is important |
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Average Disk ms/Read | Higher disk read times impact the ability of SQL queries to retrieve data from your databases. |
Average Disk ms/Write | Higher disk write times impact the ability of SQL queries to update your databases, from simple text column modifications to dropping tables. |
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The Disk Throughput chart plots the number of disk reads and writes over time.
Metric | Why it is important |
|---|---|
Disk reads/sec | A high number of disk reads may indicate that the SQL Server is executing poorly-performing queries. |
Disk writes/sec | A high number of disk writes may indicate that the SQL Server is running low on allocated memory . |
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The SQL Server Physical I/O chart breaks down the SQL Server throughput into its key component pieces, giving you a detailed view of how well SQL Server is processing your data requests and updates.
Metric | Why it is important |
|---|---|
Checkpoint writes | A high number of checkpoint writes may indicate that pages are not written to disk quickly enough for optimal performance. |
Lazy writer writes | A high number of lazy writer writes may indicate that the SQL Server is running low on allocated memory . |
A high number of page reads may indicate that the SQL Server is executing inefficient queries or that you should optimize the database indexes. | |
A high number of page writes may indicate that the SQL Server is executing inefficient queries or that you should optimize the database indexes. | |
Read ahead reads | A high number of read ahead reads may indicate that you should tune your query execution plan or that you should defragment the disk. |
Available alerts
- Average Disk Milliseconds Per Read Alert
- Average Disk Milliseconds Per Write Alert
- Disk Reads (Per Second) Alert
- Disk Writes (Per Second) Alert
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SQL Diagnostic Manager identifies and resolves SQL Server performance problems before they happen. Learn more > > |