Personally, I feel 8GB of RAM is fine for most users, but some do need 16GB or even 32GB for heavy lifting like 4K video editing, 3D modeling, virtual machines, and the like. On one of our systems, we have 4TB db with 384GB RAM. You can also subscribe without commenting. How much memory do SQL Servers have? But I did take the time to verify prior to responding, just in case. My question is: What happens when you have a 20TB data? Luis – what makes you think you need to touch it? Silent Base 600 - Window / HP Pavilion, SupremeFX Onboard / Realtek onboard + B&O speaker system, Seasonic Focus Plus Gold 750W / Powerbrick, Logitech MX Anywhere 2 Laser wireless / Logitech M330 wireless, RAPOO E9270P Black 5GHz wireless / HP backlit, Corsair Dominator Platinum DDR3 4x4GB 2000mhz 9-11-10-24 CR-1, Creative X-FI Titanium + Sennheiser GSP500, Intel 9900K 4.8 at 1.152 core voltage minus 0.120 offset. It’s been pretty hard to get information on the responsiveness our systems are giving from a user point of view, so the big question you ask about user “happiness” often is unanswered. Update your address. Miray RAM Drive offers the simple 3 click interface, turning the set-up process into a waltz. 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Reformatting tempDB and data disks from 8k clusters to 64 K clusters yeilds predictable increase in performance. I am not sure if the min memory made any diffrence. Virtual memory is basically using some secondary media (hard drives, SSD, etc) to augment the RAM. When I first started I was all in favour of giving it more RAM, but now it feels fine. I mean memory consumed by that query does not release after query execution finished. Custom Loop. There’s a huge value in having this kind of diagnostic data to improve their experience. David – sure, that’s exactly the kind of problem I solve with my consulting services. It simulates a real volume that can be used by every application as a super fast additional drive. My systems only have 12GB, 16GB and this one with 16GB but with windows 10 and is only 2.5GB on auto. The only thing i did was move it to my outer rim partition of my HDD. postgres, redis, etc. Overall, Enterprise Edition servers handle larger volumes of data, and they are configured with more memory to handle it: So in terms of pure server size, yes, Enterprise servers are larger, but as a percentage of data, something kinda interesting happens: Which might be due to a few factors, like not caring about the performance on older servers, or dealing with old servers built with much lower memory sizes. if i never needed a swap file with 4 gigs of ram i for sure dont need one with 32 gigs.. windows is set up to have "virtual memory" limited only by the size of a hard drive.. windows uses the real ram first but if that isnt enough it "swaps" out to a hard drive.. the snag being pretend hard drive memory will turn any … The median SQL Server has 19% of the data size as RAM. They keep track of all the object_id’s in the database. I leave the page file alone unless its larger then 4 Gb then I change it. Having 16GB and it's using 2432mb on auto, I just leave it as is. Most of the data is older and we’re in need of an archiving strategy, or actually using our partitioning to offload older data to less performant disk. According to the rule, I should have between 1.5 and 4 TB of RAM!!! The server has 256GB of RAM but is running SQL Server 2016 Standard Edition, therefore limited to 128GB. How *OLD* is the server (somehow, I’m picturing a 10 year old PowerEdge that hasn’t been replaced because “it ain’t broken”). A few examples from the extreme ends of memory-vs-data-size provisioning: I split the servers into quartiles based on the size of data they’re hosting: The low end percentages are a little skewed since in the 10-59GB tier, the OS memory means a lot. order by 2 desc; Psych barriers. Add memory till the performance curve flattens out ? Brent, do you have any information about Minimum server memory ? Buy Samsung Galaxy A20S w/Triple Cameras (32GB, 3GB RAM) 6.5" Display, Snapdragon 450, 4000mAh Battery, US & Global 4G LTE GSM Unlocked A207M/DS - International Model (Red, 32GB + 64GB SD Bundle): Unlocked Cell Phones - Amazon.com FREE DELIVERY possible on eligible purchases We are working with 256GB RAM with reasonable performance. You must log in or register to reply here. I almost sure that lock page in memory did make a diffrence. How do you know otherwise? We actually have more memory, but the guys read something at some point that made them fearful of giving more RAM and getting worse performance (something about plan generation). You can’t fix all those with “correction factors.”. COUNT(*) AS cached_pages, FROM sys.dm_os_buffer_descriptors With that said, I did set out with a pretty aggressive goal of using something that is pretty common in VMware homelabs which is an Intel NUC and with just 32GB of memory. Interested to hear other people’s thoughts on this. (COUNT(*) * 8.0) / 1024 AS MBsInBufferPool Windows will try to optimize memory usage, the more you have free the more it may try to use which is a good thing as it better than windows using local Page file since that is much slower. (https://blog.sqlauthority.com/2015/12/12/sql-server-discussion-on-understanding-numa/) So lesson learned. I monitor Page Life Expectancy as my primary indicator of memory pressure, and currently it’s a fairly healthy 3.5 hours, although that does drop sharply during maintenance windows. Please check out. Back in 2008, 16 gig was alot of memory. Nuff said. The computer operating system swaps highly used, or “hot” or “working set”, data between the RAM and the virtual memory space automatically. They only help marginally. The server was on fire, though, hahaha. For instance, you really won't want to run a virtual machine on a box with no pagefile, and some defrag utilities will also fail. Is the OS happy? Try running a CHECKDB, or investigate this issue: https://www.brentozar.com/archive/2018/06/cpu-cores-or-memory-offline-the-problem-with-standard-edition-vms/. I’ll see your answer and raise you one: is only consuming 1.2GB of memory. Me I have it on, just in case I use a strange ancient program that for some reason does something with it. GROUP BY DB_NAME(database_id),database_id © 2021 Brent Ozar Unlimited®. I’m thinking an 8 core 61GB (based on what is actually used) instance is probably sufficient (to help keep costs down and also get multi-AZ). Breifly, SQL Server won’t release it’s memory until it has to. HTPC400 \ Thermaltake Armor case ( VE2000BWS ), With Zalman fan controller ( wattage usage ). The highest consumer of the buffer pool is a OLTP database which is 500GB in size, and consuming 90GB of memory (just under 20%). 🙂. I have it turned off with 32GB of RAM. Lately we’ve been struggling with performance as we’ve migrated from physical to virtual and the infrastructure team don’t like the SQL Server memory hog, so they’ve halved the memory we used to have. I run 32GB and this time on auto it makes my rig reserve 4.8GB, though honestly iv usually manually made it 4GB for YEARS, and I even ran without one for awhile. (If I sort servers by how much data they host, the middle value is 219GB.) Typically that’s because your SQL Server hasn’t needed the memory yet. When I look at a SQL Server, one of the first things I check is, “How much memory does this thing have relative to the amount of data we’re hosting on here?” I’ve long used some seat-of-the-pants numbers, but armed with data from SQL ConstantCare® users who opted into public data sharing, let’s do a little deeper analysis. More than one storage admin used the 8k Microsoft recommendation. I know this was based on throwing hardware at a poorly tuned/optimized code base. I got lots of free space in some dbs. 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I’m currently responsible for a server where the total db size is 4.2TB. SQL does need “room to think”. Likewise I do not have the resource governor enabled on any server either. Anyway, with the smaller database only needing part of the data in memory, SQL left free memory. The virtual memory manager lets you set one up but it doesn't persist between restarts (at least for me). And you'll also come across applications that simply won't run properly if the pagefile is disabled. Running adobe apps I have run out of memory with 16Gb. Yikes, that’s a familiar horror story – “We don’t like how much memory this uses, so we’re going to feed it less. Windows 10 through 7 will use physical memory as "swap space" when the page file is disabled and when there is an application requires swap space which simply keeps anything from getting swapped out so, the only thing that disabling it should do is prevent you from using more memory that you have. Just a thought David – could this be either, – NUMA related? Is there such a thing as allocation of too much memory? Len – here, I’m using allocated size to keep things simple. Conclusion? Yes I need a picture “or it did not happen” And you'll also come across applications that simply won't run properly if the pagefile is disabled. ORDER BY BufferSizeInMB DESC, I guess we’re really lucky. So no additional CPU or memory needed for physical to VM transition as a performance correction factor ? ... You have to balance how much RAM you have vs the drive space, etc. I'm assuming that you were actually running out of memory. OOM kicks in an starts killing other important processes e.g. Query to return the buffer pool size per database in case it’s useful: SELECT database_id AS DatabaseID, It continually amazes me that people that don’t know are able to make those decisions, regardless of the professional support and guidence that is available nowdays. Just curious, did these percentages take into account the tempdb space as well? I wish I could boil it down to a blog post comment, but…. The perfect RAM:DB ratio is application dependant. So my db size vs memory stats may look bad, but the biggest databases aren’t those consuming memory. That when SQL started up it does not suck up all available memory. The extra RAM can also help if plan to use your PC for other things (such as playing music) as you’re playing. For our purposes 1:10 usually proves adequate. Brent – so VM systems do not need a correction factor? (Or if you lose credibility with a client where someone else comes in and says, “No no, you’re wasting money here, there’s no need for that.”). Including log files too? My limited experience has shown network attached storage (NAS) and using the network interface card (NIC) for disk I/O and communication makes the database I/O bound. Which servers are more likely to experience PAGEIOLATCH waits? You are using an out of date browser. However, if you look closer, that paged memory is consuming physical memory (basically, a page file is made in a ram disk internally.). What’s interesting is if I dig into what’s eating up my buffer pool, I can see that the largest database (ReportServer – 2.6TB!) Well, using a similar script to what Shaun posted, and trusting in first principles/concepts, I’m down to 61GB (used that target as it is an option in RDS) from about 230GB with no discernible degradation of anything. Historically, our performance point for memory has generally been closer to 70-80% of data. But keep in mind you still need a page file for memory dumps. When you move from physical to virtual, you have all KINDS of changes: different CPU families, different memory speeds, different storage network, different storage, etc. Thank you. . EK-Quantum Momentum monoblock. i have run without a swap file for the past 10 years or so.. mostly on a win XP 32 bit 4 gigs of ram machine.. no problems.. and it was originally a high end gaming machine when it was first built.. i used the same machine up until last year.. Had my first crash since coming up to 128GB today. GROUP BY My Database is 1.6TB in size and was using all the RAM in my server 1.5TB. In one of his clients othe DBA configure min memory + lock page in memory, so i agreed to make same change in the server given the fact that the other server runs a lot of process much faster than ours. I know you wouldn’t have this, but I’d really love to hear more about that “4.2TB of data hosted on 16GB RAM” system… ELSE DB_NAME ([database_id]) END) AS [DatabaseName], windows reserves literally nothing (90MB on my PC which has 32GB RAM). Find low everyday prices and buy online for delivery or in-store pick-up. 8x Nidec Servo Gentle Typhoons. It may not display this or other websites correctly. All hardware tests out without any errors, including benchmark testing that will use 100% of RAM and all updates (including BIOS/firmware) are complete. (hmmmm) I trust you. Switch from HDD to SDD to NVMe also produced a predictable performance increase. But 1 Gb is fine. Such massive RAM amounts are mostly aimed at video editors and others with hyper-sized working files. Notify me of followup comments via e-mail. It will be immediately available for use and you will see that the % amount of use of the RAM in the resource monitor will be much, much lower, as there is significantly more memory … If all the above are set, I would use 2000 mb (min=max) and see if there are any performance issues. database_id As mentioned, run the exact same process on both servers and one will utilize all of the assigned RAM, while the other will top out at 154 GB. GO. Virtual memory is your physical memory combined with the page file. You could also check the Max Server Memory setting and ensure it set to something sensible for your environment. Required fields are marked *. 4x8GB Corsair Vengeance LPX 3000MHz 15-17-17-36 CR1, Optane 900P + Samsung PM981 NVMe 1TB + 750 EVO 500GB, Americas cure is the death of Social Justice & Political Correctness, Samsung 860 EVO 1Tb/WD BLACK SN750 500GB NVMe, 1x 250GB 960 EVO | 1x 500gb Intel 720p | 32TB SAN, Inwin 303 White (Thermaltake Ring 120mm Purple accent), Schiit Fulla 3 on Beyerdynamic DT 990 Pros. my own swap file size.. zero.. i always run this way and always make sure my machine dosnt need windows pretend ram.. i do it just to save C drive space no other reason.. i like a small easy to back up and restore operating system drive.. with loads of basic programs on my C drive is 30 gig used out 128 gig.. No virtual memory breaks down many things. Increasing memory is unlikely to dramatically improve performance. In general, it would be great to know more about these findings. Too many factors for a correction factor. FROM sys.dm_os_buffer_descriptors While an identical server with the exact same DB, settings, software, AND hardware (both purchased at the same time) will run the same process and use all of the 250 GB of dedicated RAM. CASE WHEN database_id = 32767 THEN ‘ResourceDB’ ELSE DB_NAME(database_id) END AS DatabaseName, I think its important to point out that is you use a program like Samsung Magician it can and will change your page file settings. 4TB on 100GB. RAM for gaming – 64 GB: As of mid-2020, nearly every gaming expert considers 64 GB of RAM to be overkill for gaming. Also “RAM” is it referring to max memory assigned or full OS? I’ve seen one case in particular where folks restored a ~10TB data warehouse onto a 16GB RAM server just for periodic reporting & auditing purposes. We changed other parameters los CTP, max memory, etc. Miray RAM Drive Plus allows sizes up to 24 GB (4 GB … FROM I turned off page file, assuming I would never run out RAM. GROUP BY [database_id] Your email address will not be published. Looking at going to AWS RDS, and based on the total amount of memory by database (vs free/empty space), it’s 104GB used with 34GB empty. Dark Rock TF air cooler.. Stock vga air coolers with case side fans to help cooling.. 150 nvme boot drive partition.. 1T Sandisk sata.. 1T Transend sata.. 1T 970 evo nvme m 2.. 27" Asus PG279Q ROG Swift 165Hrz Nvidia G-Sync, IPS.. 2560x1440.. Gigabyte mid-tower.. cheap and nothing special.. As you can see from this CPU and Memory display, the QNAP TS-x53D NAS has recognized and made available the 16GB of crucial memory. This query will give you the buffer pool usage per database: SELECT (Max memory size and file sizes are discussions for another blog post.). I took last Thursday’s data for about 1,400 servers, then excluded stacked instances (multiple instances installed on the same OS), Azure SQL DB, Managed Instances, and servers with less than 10GB of data. Windows kernel is constructed to rely on it. In the past I would have been reluctant to change anything from a vendor… but if performance is terrible, then… at the very least I’d be asking the vendor why that is and if they have a set of indexes they could apply. All Rights Reserved. mongo's using ~87GBs of ram, nearly 4X of the size of its whole dataset) So, Is this much memory usage really expected and … You can force SQL Server to clear out it’s memory buffers by running DBCC DROPCLEANBUFFERS, but I would not advise using this on a production system. ( Still waiting for Santa to drop off my server with 640GB of memory to test one and two hundred gigabyte databases with. ) I love teaching, travel, and laughing. 4TB total databases volume (only a small fraction is active in usage in terms of current processing and reporting), with 256GB RAM/16 cores. Newest HP 14-inch Chromebook HD Touchscreen Laptop PC (Intel Celeron N3350 up to 2.4GHz, 4GB RAM, 32GB Flash Memory, WiFi, HD Camera, Bluetooth, Up to 10 hrs Battery Life, Chrome OS , Black ) Acer Chromebook 315, Intel Celeron N4000, 15.6" Full HD IPS Touch Display, 4GB LPDDR4, 32GB eMMC, Gigabit WiFi, Google … The only reason I’d say yes is that if you give too much memory to one server that doesn’t need it – when you could give that memory to another server that does need it. Mark – yep, to SQL Server, they’re the same. – Resource Governor? Want to advertise here and reach my savvy readers? Then, can we give that same advice to customers? When you say “correction factor” – you’re overthinking it there. The disk queue may not get above 5, but disk busy time can reach 80% or more. Every once in a while PLE would nose dive, but come back up, and plan cache went from a few hundred MB to several GB in size, but as far as what Solarwinds shows on most panels, you can’t tell the difference in buffer cache size. Privacy Policy – Terms and Conditions, {"cart_token":"","hash":"","cart_data":""}, sp_BlitzFirst – instant performance check, sp_BlitzQueryStore – analyze queries over time, [Video] Office Hours 2018/11/14 (With Transcriptions). Let’s slice it a different way, though: let’s take the median data volume out of this sample, 219GB. How long does it take to boot up and shut down? Price Match Guarantee. Shop Lenovo Yoga C940 2-in-1 14" 4K Ultra HD Touch-Screen Laptop Intel Core i7 16GB Memory 512GB SSD + 32GB Optane Mica at Best Buy. but not about MIN memory parameter configuration. By holding data pages in memory, SQL Server avoids having to load those pages from disk when it requires them. Interesting findings. Are the users happy? I guess it is my ignorance that I’ve seen SQL take and give memory back for small databases. JavaScript is disabled. Thanks for any help. SUM (CAST ([free_space_in_bytes] AS BIGINT)) / (1024 * 1024) AS [MBEmpty] (As can be seen, to overcome this problem, we've increased the RAM to 183GB which now works but is pretty expensive. (https://docs.microsoft.com/en-us/sql/relational-databases/resource-governor/resource-governor?view=sql-server-ver15). We do have indexes where our main performance hits are. The queries would take days to run, but they didn’t care because there wasn’t an urgency on those particular queries. Which servers are more likely to experience RESOURCE_SEMAPHORE poison waits when they run out of query workspace memory? I normally allocate 75% of the data storage. He is the developer and he likes to go behond his role and change parameters for his aplication. Been no reason to touch it. Are your numbers based on the allocated size of the databases, or the amount of space used in the databases? I teach SQL Server training classes, or if you haven’t got time for the pain, I’m available for consulting too. I turned it down to 1GB as I feel I won't be running out of RAM any time soon. I just noticed today that after installing 128GB RAM Windows 10 decide to shovel 129GB of my SSD storage for virtual memory. In our case we’re dealing with a 200GB+ legacy vendor database that tends to scan whole tables of data prior to presenting a dialog for users to search for what they need. But yep, absolutely, when I’m doing detailed space forecasting, I do the same thing. That's why even though you disable the page file, there is still data that resides in it. If you reach your memory limit or have a crash you system will lock up. We’re talking tables with a couple million rows 150-200 columns that are either char or datetime. COUNT (*) * 8 / 1024 AS [MBUsed], The thing is that one of my clients is running a very “needy or hungry” for resources Sql-Server 2016. For future reference, I suggest posting requests for help such as this to dba.stackexchange.com or using the #sqlhelp handle on Twitter, where there is a large community that will be keen to help. Sure, that’s exactly the kind of analysis we do in our consulting. It is normal to see SQL Server consuming around 80% of server memory, even when under relatively low load. (example: 27GB data, 20GB RAM), 60-224GB data: 23% RAM size (example: 210GB data, 48GB RAM), 225-600GB data: 13% RAM size (example: 488GB data, 64GB RAM), >600GB data: 6% RAM size (example: 2.1TB data, 128GB RAM), Standard Edition median data size is 168GB, median RAM size is 32GB, Enterprise Edition: median data size is 358GB, median RAM size is 54GB, Developer Edition: data 111GB, RAM 16GB (poor developers), Standard Edition median: RAM is 23% the size of the data, Enterprise Edition: RAM is 17% of the size of the data, Developer Edition: 11% (c’mon, man, let them get some memory! Just want to clarify, when you are looking at “data” size are you referring to total of all files for an instance or full server? For a better experience, please enable JavaScript in your browser before proceeding. windows only* reserves memory if it is required to VRAM your soc (because it has to take that RAM away from the system to render your UI or whatever). We’re right in there I spose. I have database size around 90GB. In our SQL Server Setup Guide, we tell folks to leave at least 4GB to the OS, and I think most sysadmins would consider 2GB to be the bare minimum. That’s a great question. During my work the genome assembler took a spike up to 122GB RAM usage and before I realized it showed me the blue screen, I lost about 500GB of work in progress. Has anyone experience the same issue? Good news – the answers are in the post! I personally use to set my local page file as small as possible to force windows to take advantage of my physical memory. Seeing how many people run with it disabled (when having lots of RAM) this is evidentily not true. Click Consulting at the top of the site to learn more. We’ll definitely be sharing more about the findings with the clients & training students. No matter how big your RAM is, DO NOT TURN OFF the page file! Miray RAM Drive provides a classic RAM disk as virtual drive on Windows. Going with less than that “sweet spot” will cause some data to be written to much-slower virtual memory on your storage drive. I know this is not the case. ORDER BY In my capacity management work I forecast based on the space used, figuring that unused space doesn’t contribute to buffer pool demand. (Max memory size and file sizes are discussions for another blog post.) I’d like to know if its actual data size or data file size. I live in Iceland with my wife Erika. Any thoughts as to why the one will not utilize the RAM? Meaning, if it’s hosting 100GB of data, it has 19GB RAM in the server. But still, the dropping percentages as data grows – that’s pretty steep. Yes additional queries will take up memory but data is loaded 64Kb at a time so it takes bigger chunks. mine set itself to 16000+ Mb's as well. DB_NAME(database_id) AS DatabaseName, Why is the performance worse?”. What is the real rule of thumb? Of course this is a terminal server that's been press-ganged into having a SQL Server Std. (Meaning, if you put 3TB of data on a 64GB RAM VM, how bad will the wait stats be?). Enjoy. 2.5 TB DB total, 1.7 TB data with 250 GB RAM dedicated to SQL. Adequate high-bandwidth RAM to smoothly run multiple applications and browser tabs all at once. A majority of the most of the tables have compound primary keys across 5-6 char columns …. SELECT To calculate the "general rule" recommended size of virtual memory in Windows 10 per the 8 GB your system has, here's the equation 1024 x 8 x 1.5 = 12288 MB.So it sounds as if the 12 GB configured in your system currently is correct so when or if Windows needs to utilize the virtual memory, the 12 GB should … The median SQL Server has 19% of the data size as RAM. To take a few examples from that median: 84GB data hosted on a SQL Server with 16GB RAM… Welcome to TechPowerUp Forums, Guest! Then increase RAM to 16GB if issues arises, then if further issues, increase page file by 1GB.....then RAM by 4GB, then pagefile by 2GB until max of 32GB RAM and max of 12GB page file for your case. I got some big uns. However, SQL will not use over 154 GB. I doesn't hurt anything to leave it but take up a little space. MBsInBufferPool DESC (Obviously you wouldn’t wanna evaluate and architect a 20TB system in a blog comment.). If there is a difference, the application itself starts throwing errors, even if the part we changed was in a totally different area. https://ibb.co/VDPtBtt (image of memory usage over time, graph is from a Grafana SQL Server monitoring dashboard plugin, actually has some more useful things than what Solarwinds DPA shows). There are a lot of other factors at play, like query volume, tuning done, wait stats, etc. [or this could be a local anomaly experienced by me and no one else] Hey now mine was set to 16GB for some reason. And it consumes about 85GB of RAM. Meaning, if it’s hosting 100GB of data, it has 19GB RAM in the server. For example, showing them a chart of where they rank for data size vs memory vs happiness. Samsung 32" TV IPS 1080p, Dell 23" U2312HM IPS 1080p | 19" Dell on KVM..mostly headless operation. Try monitoring the buffer pool size and you should see it increasing gradually. i just set it to 2000Mb's for max, and Min, and never look @ it again. ), SQL Server 2008 and 2008R2 median RAM is 15% of the database size. Really interesting thanks. sys.dm_os_buffer_descriptors NUMA is no longer “supported” and not setup on my registry on any of my servers including this one. Hey Shaun – thanks for the reply, but sadly it is neither of those. Dealing with a client-dedicated SQL Server 2016 Enterprise. Any feedback will be appreciated, Hector – sure, if you need help with your system, shoot me an email and we can talk about what a consulting engagement would look like. Psst – it’s holiday card time. https://blog.sqlauthority.com/2015/12/12/sql-server-discussion-on-understanding-numa/, https://docs.microsoft.com/en-us/sql/relational-databases/resource-governor/resource-governor?view=sql-server-ver15, https://www.brentozar.com/archive/2018/06/cpu-cores-or-memory-offline-the-problem-with-standard-edition-vms/, https://www.mssqltips.com/sqlservertip/6736/sql-server-lock-pages-in-memory-awe-api-windows-task-manager/, 84GB data hosted on a SQL Server with 16GB RAM, 219GB data hosted on a SQL Server with 15GB RAM (OS has 7% of the data size), 4.2TB of data hosted on 16GB RAM (HAHAHA), Servers hosting 10-59GB data: median RAM size is 74% of the data! Not a big deal unless you have limited space. THEN N’Resource Database’ instance on it for budget reasons but 800% of data size means our buffer page life expectancy is answered by "when was the last time the server was rebooted" and our buffer cache hit ratio rarely drops below 100%.
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