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Physical Reads per Query: Finding What Drives Disk I/O

December 12, 2014
Pinal Dave
SQL Tips and Tricks
Disk, SQL DMV, SQL Performance

The storage team asks which query hit the disks. Here is how to answer with physical reads, and why the answer depends on how you rank them.

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Capping File Growth So One Query Cannot Fill a Whole Disk

July 27, 2014
Pinal Dave
SQL Tips and Tricks
Disk, SQL Data Storage, Transaction Log

One runaway load can fill a shared drive and take every database down with it. A MAXSIZE cap moves the failure to one database.

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SQL SERVER - Disk Space Monitoring - Detecting Low Disk Space on Server

SQL SERVER – Disk Space Monitoring – Detecting Low Disk Space on Server

August 2, 2013
Pinal Dave
SQL Tips and Tricks
Disk, SQL Scripts, SQL Server, SQL Stored Procedure

A common question I get: how do you go about detecting low disk space on SQL Server? Here are two ways, including xp_fixeddrives, and the one I prefer.

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A wide new road ending at an old one-lane stone bridge, cars queued at the bridge and the road behind empty.

Choosing Hardware for SQL Server Now

April 12, 2013
Pinal Dave
SQL Tips and Tricks
Disk, Hardware, SQL CPU, SQL Server

Choosing hardware for SQL Server Now means matching core cost, memory, and storage latency to measured workload needs and future growth.

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Reading Pending I/O Requests During a Storage Slowdown

March 16, 2013
Pinal Dave
SQL Performance
Disk, SQL DMV, SQL Performance, SQL Wait Stats

Sample pending I/O requests during PAGEIOLATCH or WRITELOG stalls, map each request to a file, and share timed evidence.

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A kitchen cupboard crammed with unmatched container lids, a red one at the front.

Finding Orphaned Data and Log Files Nobody Attached

February 23, 2013
Pinal Dave
SQL Tips and Tricks
DBA, Disk, SQL Data Storage, SQL Server

Inventory orphaned data and log files by comparing data-folder contents with sys.master_files, then review candidates before cleanup.

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A red watering can carried across a long garden from a distant tap

PAGEIOLATCH_SH Waits: Slow Storage or Too Many Reads

May 13, 2011
Pinal Dave
SQL Performance
Disk, SQL Performance, SQL Server, SQL Wait Stats

Diagnose PAGEIOLATCH_SH waits by comparing file read latency with Query Store physical reads before blaming storage or changing indexes.

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