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Building automatic adviser & performance tuning tools - Julien Rouhaud & Tatsuro Yamada: PGCon 2020

Julien Rouhaud
Senior Member Of Technical Staff at VMware
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PGCon 2020
May 27, 2020, Online, Berkeley, USA
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Building automatic adviser & performance tuning tools - Julien Rouhaud & Tatsuro Yamada: PGCon 2020
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About speakers

Julien Rouhaud
Senior Member Of Technical Staff at VMware
Tatsuro Yamada
Senior Database Engineer at NTT Comware

Julien is working with PostgreSQL since 2008, back to version 8.3, and never wanted to use another system since then. He's involved in the community at various levels. He's helping the french community participating in conference organization, helping users on the french forum and translating the documentation for many years. He's also involved in many open source projects such as PoWA (real-time tuning and advisory tool), author of HypoPG (hypothetical indexes for PostgreSQL), and contributing to the PostgreSQL project itself. He worked for many years as a PostgreSQL consultant, helping on various aspects (performance, training...) and is now working at VMware, still working on PostgreSQL related duties. He was the treasurer of the PostgreSQL French Association for many years and is now the vice-treasurer of the PostgreSQL Europe association.

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Tatsuro Yamada is a database engineer at NTT Comware and performs consultancy and support service for NTT group company. He gave talks several times in PGCon Japan, PGConf.Asia, PGCon, PGConf.Eu and PGConf.Russia. Also, He is a member of PGConf.Asia organizers since 2017. He is an oracle_fdw committer and pg_plan_advsr author. Additionally, He contributes to PostgreSQL core to help DBA such as creating Progress reporting features for CLUSTER/VACUUM FULL on PG12 and for ANALYZE on PG13. Currently, He focuses on improving pg_plan_advsr for automated plan tuning feature more efficiency.

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About the talk

PostgreSQL is a mature and robust RDBMS since it has 30 years of history. Over the year, its query optimizer has been enhanced and usually produces good query plans.

However, can it always come up with good query plans? The optimization process has to use some assumptions to produce plans fast enough. Some of those assumptions are relatively easy to check (e.g. statistics are up-to-date), some harder (e.g. correct indexes are created), and some nearly impossible (e.g. making sure that the statistic samples are representative enough even for skewed data repartition).

For now, given those various caveats, DBA sometimes can't always realize easily that they miss a chance to get a meaningful performance improvement.

To help DBA to get a truly good query plan, we'll present below some tools that can help to fix some of those problems by providing a

missing index adviser, looking for extended statistics to create, and row estimation error correction information to get appropriate join orders with join methods automatically.

- pg_qualstats: provides a new index and extended statistics suggestions to gather many predicate statistics on the production workload.

- pg_plan_advsr: provides alternative good query plans automatically to analyze iterative query executions information to fix estimation rows error.

In this talk, we will explain how those tools work under the hood and see what can be done, how they can work together. Also, we will mention what other tools also exist for related problems. Therefore, it will be useful for DBA who are interested in improving query performance or want to check whether current settings of indexes and

statistics are adequate.

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How do I run and Welcome to our talk. Today, we'll be talking about building a automatic advisor and performance tuning tool in Possessed. Red first, let us introduce ourselves. Hi. I was at the Royal mother and I work for energy to Conway as a database engineer. I'm a contributor. What? I contributed to progress reports and features such as cross that out? The other Iceman. I was a little shocked with the Orca whale teeth out and organized, a member of Asia. My name is Rahul.

VMware, I tried to contribute as much as I can to further strengthen its ecosystem. In general, is the author of A hyperextension and the cause of a way to learn some of the exemption used. By US, will be covering the following for Section first require plan, and are some tips on detecting inefficient plans. Then we'll be explaining the usual reason causing an inefficient plan to be chosen by the farthest planet Sunday. And this section section is a highlight of the stock would be introducing nice tools that we created

to get more efficient plans with a shoulder more for each of the tools and its contact. I see if you will know what's a good, if Ronnie is just in case restaurant. Should we have a secure and clear France? Why is it means you only need two special II. What is the one theory that was set? As know how to update on how to compute the desert is Audrey, BMS job Downey, Cradle to might as well or I could find that which will choose the best method to do. So for example, if I use, I want to retrieve data from what able to clear, it does not need

to switch wires chemicals such as in this can or a secret shopper scam. The sun will run. The steps to retrieve is I want the theater is call Zachary Brown. Some people refer to it as pretty as the tution from institution brown or prom. Southwest Brown is represented by a tree structure and it's composed of entrepreneurs such as can join and obligations. It is safety among various as opposed to the france-based along its Coast Guard created during the Transfiguration. Soul is a

very Brant Rosen by the front are always the best one. Unfortunately, no, for a variety of reasons, if chanticleer, Frank can sometimes be true so it can be very problematic as it can result in your very wrong. If a crucial time anyway you can do is explain. Come on Read through that, there is ample in Egyptian crown. This is a typical example, by if it's clear Brown. You can see here enjoying being performed using an S State Route 2 in apart of the road is over. So you can trust and will be executed as many time, Sarah Rose into outer part of the road.

you can see that there are many sequences go into in the north with a journey to seek answers, Nobody Wanna You know what? That was that you that father is executed twenty-five thousand times to avoid it to win 25,000 tickets and scan, but it's still very inefficient way to perform with the train. I just wish you were here to improve their education time to be to create an index. We just saw Isabel weather in here since it was caused by the route to win this round. Wheeler's do Cabazon. Internet ride.

Now let's focus a little bit on. The reason why in African plants can be true reason why can happen here on those three? Major reason why an inefficient plant can be sent. The first one is connection issue. The second one is a statistics issue and the last one is user-friendly specification. Index deficiency of a new clothes. When you forget to create an index to shoot some of your queries, we should use this example Dahlia. There's a program that an index actually exist but for some reason it cannot be used as it

happens because of how you wrote some of some of your queries. For instance, it if you was a function for the Colombian Festival in. So we're ordering clothes than a specific function at index is required for an efficient execution. When was the case is when the need exists. But for some reason, isn't used to live in Columbus of acrobatics and Tuesday is the predicate of your query from the times that requires to perform a task of preventing us from, being used to create a dedicated index for each grade, but we do not

want to do that blanket and did each index you add the spots that increase the right time? So it's better to minimize the number of index created to optimize the musical chorus. After 10 times when possible to rewrite your Curry so they can use the existing in Texas. I hope you can easily imagine a thousand of Curry's. It would be a very difficult to explain. What are the statistics, using a sample of each other on a regular basis in your career plan to compute? It's not Canada, Indian city DVD, and come up with an exact

address of 26 include by your data such as the number of distinct values to come on values and their frequency and so on. As you can imagine having incurred such a stake relate to increased cost calculation of these. As the most famous examples of inefficient plans, being selected you to inaccurate statistics. The first one is autovacuum training program. With the volume settings, the statistics were be computed, Lester complete, resulting. In a larger difference between the actual data and statistics usually happens when the barrage or have an increasing number of frost

around like receiving of the workload, but should be setting. No. Run out of a chrome frequently enough. This could be tuned using the ultimate human, allies threshold and other vacuum Annalise spilt actor. This could be done to change the value on the festivities. This evening as we show in classic contemporary technology, quite different kind of table. As far as 30 seconds are in the meaning of that, sort of thing will never be able to compute statistic for them automatically by the

foot. No, such a step would be available for the different number of floors would be used. Just mail it to quite incorrect plant technician. Do you want solution is simply to run manual analyzing system after populating data. You should perform a larger than the fries in the transaction and then Derek exactly to carry the president would probably use the old statistics and data won't be able to see the new data also Auto vacuum will launch on me every minute. So if there is no guarantee guarantee, that's what about you did, wake up and

already completed 1st 86. When you are sixteen years to speed the process, the transaction is the following steps, all the delete button Craigslist, 36 using analyzed, and then you can go. And we usually crazy execution. What I mean here by Planet specification, as various tourist sticks used to compute, Kevin, Indian city DVD, The most frequent issue was so serious. Dick is how I ended pretty gets a computed that Whispers mess when he gets home that was pretty cats are independent.

This means that each of its predator 3 DVD with the applied on top of the other ones. This usually works, well, as most of the time is kinara Indian independence. For instance, a zip code on a city named as we can see in this example of candy to dramatically wrong estimates and pussy, be dramatically, slowed Korea. The solution is to take advantage of the statistics that were introduced a few years ago. In PG, 10 universe cost calculation that considered correlation between currents of the same table and greatly reduced activity is immaterial and scan

and aggregation. Unfortunately, for a sunny place, on East, 32nd of the use for drug classes, that's the only solution to fix it is the use of extension such as eating plan. Here is a quick summary of The Cozy, some solutions to having value solution mention. But do you know what? I got to type of work. I can help you in investigating those problems and implementing the solution. We'll talk about the stores in the next section. This action will give a demo of to advise our tools with their product, which can help you to get an efficient plant. The first one is physical

start, automatically suggests indexes and find created columns, optimizes a quarter plan for Cory is having many join condition. The hotel is at, let's start with how we can do a global suggestion for, in Texas with a show theme of the results. And finally summarize if I use Waze, is exemption can help PGA course at El Paso School extensions that keeps track of predicate statistic in an efficient way to Rouse was I suppose I need a scanner to scan and soul. Ourisman traits also karaoke to so unique. Ready Notifier setup using

to suck his dick. It's also brings a global index advisor to suggest a minimum number of Dixie's to optimize as many queries. A specific person walks in a very simple approach of the interesting predicate for index suggestion. For instance, the pretty gesture Twitter at least 50% of the input process that are exhibited in a second. Trash can, in this example, retrieve for credited, two of them being combined predicate, During the second step would be the complete set of path. Those include all possible. Combination of predicate that may include. Those are pretty cats

or not. Who's the first pretty case. We prove it to you retrieve in the first step, we can see he is at 7 past hour plus Heber Springs. Assisted the country to school for each path, to scream it or use it quite a giveaway to each predicate in each path Curtis when you choose a number of simple predicates LeConte, in this example, we can sees us the left past has three predicates one for the kids, having a similar projects which is to empty one that idea for something. I don't know why I'm having two single simple 4 digits. She won the tide equals something and the T1, the TS equals

Angeles one, having three singular, simple predicate, The phone just passed house is cool off. 600 step simply consists in choosing the highest go fast with Jesus is the first index to create these things. This past is present from the past as instead the importance of Princeton of which Winn-Dixie in the program, in the predicate Evans in the west coast, and all those echelons are adding in the ascending weight order in the past. When's the index is generated optimized for the Jetta removed from the

list and we'll just talk again from the first step and he already gets out. Obviously, I present it to you as soon as the destruction of the approach in the real implementation, many other parameters are handled such as preachers that can be optimized using I come to your teammates with the magical demonstration of the global index attraction in Columbus and the sex column without an index. Usher Rosa interstate and then a few kuriza Executives using with paper tickets combination. The

goal is not to be representative of a real work road but runs out to show. What are the possibilities of this approach is very easy to perform to go to the 50% in Tax Advisor, start. Depending on which way you want to consider all the different values except for the cell theory, T to consider all pretty cats featuring at least 50% of their box. Here we can see that's three indexes that suggested to optimize a crostata previously, run. One of the index being a strigoi, don't Index. This

is alive. Predicate in Miss operator, can you process as the operator class to use the Browns on the shopping pass through the predicate? So it requires an immediate intention of using the predicate you can easily find out whether someone got character was used on. And that's all decide which Opera has to use for the index. Keyshia Cole start is a useful extensions. I can help you extract knowledge about your prediction workload to focus on the complex in part. Thanks to Weiser, but don't forget that this extension gives a lot of precious information that can be used for

other optimization. For example, as it computes, the selectivity estimation are all. You can find out if somebody gets a correlative or if you have elevated statistic issues. Sophia. I will talk about the following Four Points. Fidget bronze. Weiser is a 2 Chainz count, what's Mexico to eat true? Therefore, on and the channel to my scan missile, join me. So it's enjoying. It has the following Alabama. The machine perform with the Junior and other than a few runs. Show me is impossible. Even when there is noise part 2 to talk to my location

for experience. It is possible to see Julian proposal and scan you. Then it's going to find out my prom. It's can control each brown nose and find out tomorrow. Frank. May never have been able to buy Firefox rest. It has a proud history in training process. Is it supposed to refer to the front history in the training process and the result to reproduce any prawn in the history? This tool works well for complex, queries with many joints. So I believe it will prove useful in the eighties. And your sister

dinner of Mansfield. It is useful for front unit during a Home, Estates and troubles, especially analytical Rock Road in, your field of study, it is useful to benefit from the capabilities. You can chat security and homasote Society frowns. When there is no estimation point, How can this to achieve an automatic tuning? I see, you know, Sarah March, 1st steps, and post it as clearly as a Christian. I added your Facebook group with. Probably wiser in some of those steps.

Which hours is it to do threesomes? Why did you text me? Show me to add two crushed ice machine lyrics by using Visa back to the info on Next Three Days, Grace show 3 or information, such as brown, execution, time, and of course, my son hates out of formation. If you use this extension with Experian, Iceman for Swiss can use to improve acoustical creation because it'll fix it. Now, it's misionera on each subsequent execution of Superman. Okay, I'll explain how to create their own estimation little horns, and it's right. For example, rest are corrupt, cops

arrest Brown, there is an era inside, estimated rolls over to Fastenal. If you could sit on you guys with the plan to be better athletes, no relying on correct. Statistics from the next page will show you a damn about those deposits are created from. You seems an automatic buy, Pastry Pride, the fisa and shorten Sartori as the tution time. I love you is that it's glory from joining or The Benchmark Discovery is 31 CC Calhoun and 4 aggregate functions, the size of India by the environment

as indicated here. Diadem has the following operations Artscape 30 Tierra, Rosa fast. If this is down to search for optimal Prime. Is the fastest Dave or just the front history table, you'll be able to see if there's a cushion time. Will you? Please show 10th and also how it's made from your ass will be corrected. Finally, Revealed schedule isn't that? It's crucial for two different versions of the same query. Why it's ours out? Quit. It. Has a fascinating problem. That's why it's a truant

query. Rancho near will be completed in about 60 seconds for this demo. This number indicates an hour away is Christian with curry. As you can see the execution time, it's different in each direction as brands that changed every time. Finally. Junior is completed the price history table on the next page. This table contains ID. Friday, West, Des Moines, and execution, time to Clarity ID and pride in Asheboro, and individuals institution on the restaurant. You can see that information when it's fixed and on time.

Junie wants us to improving performance by. If I stay over at 8, After the training process, you can get Optimizer hands to reproduce the ultimate strong. So you can benefit from this up tomorrow. Prom in other environments, I had to choose the keys to the Target glory and we will show you re verification results on the next page. Crested caracara how many hours is original clearly wrong. You're going to see the Optimus Prime. It's much faster. Let's take a look at the table. The

performance Improvement is about 8 times the results, prove the effectiveness of the tools. I seen that you is a witness of automatic joining OPG, bronze Weiser, Disparate short summary of Beauty Brands visor or so South to, my strong can be reproduced own environments. Highway 12. It's okay, no problem. By using a back rub to improve, its customer appreciation, during which. Of equations. In the demo, which shows my spiritual and clarify home has improved with a x as an example. So far, we talked about to two speakers. And patient plan advisor. The most enticing tools

with very different walking Ranch, however, that can compete each other for better efficiency. There is a global scheme of how to benefit from both of the doors enough courage, to get a significant for clothes. If you can use physical side to see if any index is missing course, you should many would expect a serious heat index be for creating them. Then you can use pictures that says not to Farnham queries and you speak newspaper start to feed the house of curries that. Have many John's Basilica video. Tomato boss. Finally. Agrees

using pitcher plant advisor can lead to significant performance improvements. The first two parts explained Kirkland's was an inefficient plants and the most frequent colors used for them with screws on how to fix. The problem. Is that last part we introduced to advise any tours, physical stats, on PGA, and adviser, and show that use HP to a quick demo. We also briefly introduce how to welcome them. So please give it a try, anything. Back in position is very, welcome.

Trinity Advising schedule electric Curry or estimate around detection, have large mirrors for the VA, so we won't start. Things to draw attention, and you supposed to run with Julian and tetsuro, please go ahead. Heights of first question would be, the question was, it was said that Bishop an adviser is a book. What's the status of pitching. That is stable. It's grown person is 2.0.2 and it's used for protection system without the Bucks. The second question, is the method behind PG plan advisor was explained but how is it intended to be used

in? Practice? Wouldn't automatically optimize in the background or does a DBA need to manually intervene So, yes, or no. Is the current status of an adviser is to be used manually. So you have to detect electrons, which curries could benefit from automatic optimization, and then launched process manually in a interview section. As we explained in the talk, we have some idea on how to select the interesting theories that could potentially beneficial from a Bishop an advisor. And

we also have plan to integrate it with a tool called Power where to find the lock, has in his career and do it in the background and are presently the results. As soon as you are finished up, messing them and show me a summary of what, is the how, how it looks like, like of the same. I'm not in a rush or fall, but this is a long-term plan for now. You can only use it in your interactive way. Okay. Thank you. I think that's all the questions you have. Thank you for coming back and answering the questions, and thank you for your talk,

appreciate it. And thanks to everyone for watching. Thank you, goodbye.

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