![]() To start downloading by simply Drag’n’Drop to special folder. “Auto WGet Daemon v1.8.3 is a free utility set for driving GNU WGet orĪny similar utility for downloading files. It was done…long ago by some Warped hacker who got here before iĭid…just need to find the name of it for this OS…ĭang, i keep thinking it was called WeGet…NO…i found it (Google is Shouldn’t be too hard to do that here…come to think of it, i reckon Probably used a fetching program like wget (because on OS/2 it was Script which was activated when a URL was dropped in the folder, and I don’t remember the name, but i guess it was little more than a The incoming pipe FULL) as long as needed to keep the owner/user happy… The folder (or rather, the folder’s magic) would ‘manage’ all theĭownloads dropped in (restarting stalled threads, etc etc and keeping Go get SQLQueryStress now, and get the usp_RandomQ scripts for the top queries from that hit the Stack Overflow database.I remember back in the dark ages of OS/2 there was a way to put aįolder on the desktop (or wherever), and then you could swipe and grabĪ URL from anywhere and ‘drop’ it in the folder and walk away… It’s a great way to show a server that looks like home, and gets students to figure out which queries are causing problems – and which ones are just harmless background noise. ![]() I love using this quick-load-generation technique in our performance tuning classes. The end result is beautiful – well, at least if you want something that looks like a production server getting hammered with all kinds of different queries: AAAAAHHHH, THE SERVER’S ON FIRE Instead, by using %2 before calling GetVotesDetails (which gets blocked in my scenario), I make sure that no more than half of my sessions will get blocked at once. After a few seconds, the only symptom my server will have is blocking – and that’s no fun. Due to the wonders of random number generation and very fast queries, if a blocking chain starts on any two sessions, then eventually the rest of the sessions will also call the stored proc that’s susceptible to blocking. You don’t want to hard-code the same values because then that relevant table data will end up getting cached in – some of my workload queries simulate blocking. If you wanted to get really fancy and test procs with lots of parameters, you’ll need to generate those in usp_RandomQ. This is handy because each of my stored procedures don’t have random number generators – they’re designed to mimic more real-world stored procs that have input values. (Oh, I wish it were.) All of the stored procs it calls will still show up in the plan cache, parameter – note that some of the stored procs take an For example, the stored proc GetBadgesDetails takes and uses that to look up a particular badge number’s details. The work involved with building this execution plan isn’t significant, and it won’t be the largest part of my workload. WITH RECOMPILE – I use this because I don’t want the usp_RandomQ stored procedure to show up in my execution plan stats. Here’s what mine looks like for one of my query tuning demos: Since SQLQueryStress will be calling this stored proc dozens of times at once, you’ll end up with a variety of different queries running simultaneously. (for example, if it’s divisible by 3, run sp_C, Based on the mod of that number, run a stored procedure.Declare an integer, and set it to a random number.Rather than calling a single query, call a “shell” stored procedure that runs other queries. As soon as I set the server and auth methods, the database list gets populated so I can set my default database: Setting up the connection stringīut you want to test more than one query at a time, right? You want to test a variety of different queries running all at once. In this instance, I’m pointing it at one of my Availability Groups, using Windows authentication. This is an oldie but goldie app that will run any one query thousands of times (or more) from dozens of sessions (or more), all from the comfort of your desktop: SQLQueryStress in actionĪfter you install it on your desktop (or a VM in the data center, whatever, just not the SQL Server you’re trying to load test), click the Database button to set up your connection string. ![]() Instead, let’s use the neato open source tool SqlQueryStress ( latest exe) to fake it. However, in the words of a timeless philosopher, ain’t nobody got time for that. In a perfect world, you want to exactly simulate the kinds of queries that the end users will be throwing at your SQL Server. Load testing – real, serious load testing – is hard.
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