San Francisco - 2015
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San Francisco in April, 2015.
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Taglit - plan
Каждая группа Таглит включает 40 участников, которые путешествуют вместе на протяжении 10 дней. Кроме участников, коллектив состоит из двух местных ведущих (мадрихов), которые прилетают с группой в Израиль, одного израильского гида, ответственного за образовательную программу, израильского медработника-охранника (ма”ар), водителя автобуса и 5-6 израильтян-сверстников, присоединяющихся к группе на все время поездки.
Содержание программы концентрируется в трех главных направлениях: главные события в жизни еврейского народа, современный Израиль, и основополагающие ценности иудаизма. Поездка включает в себя путешествия, прогулки пешком, дебаты и дискуссии на различные темы, встречи с интересными людьми, прогулки на джипах и верхом на верблюдах, морские приключения и многое другое.
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Это значит, что стоит присмотреться к улучшениям в версии 8:
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- Улучшениям в оптимизаторе запросов и диагностике
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It is very easy to find if a database installation is having issues. You only need to enable Operating System monitoring. A disk, memory, or CPU usage change will alert you about the problems. But they would not show *why* the trouble happens. You need the help of database-specific monitoring tools.
As a Support Engineer, I am always very upset when handling complaints about the database behavior lacking specific database monitoring data because I cannot help!
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I will show which monitoring instruments will give information on what causes disk, memory, or CPU problems.
I will teach you how to use them.
I will uncover which performance impact these instruments have.
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Recommended
Taglit - plan
Каждая группа Таглит включает 40 участников, которые путешествуют вместе на протяжении 10 дней. Кроме участников, коллектив состоит из двух местных ведущих (мадрихов), которые прилетают с группой в Израиль, одного израильского гида, ответственного за образовательную программу, израильского медработника-охранника (ма”ар), водителя автобуса и 5-6 израильтян-сверстников, присоединяющихся к группе на все время поездки.
Содержание программы концентрируется в трех главных направлениях: главные события в жизни еврейского народа, современный Израиль, и основополагающие ценности иудаизма. Поездка включает в себя путешествия, прогулки пешком, дебаты и дискуссии на различные темы, встречи с интересными людьми, прогулки на джипах и верхом на верблюдах, морские приключения и многое другое.
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- Современному SQL
- Поддержке JSON, NoSQL, MySQL Shell, и возможности работать с MySQL как с MongoDB
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Kubernetes is the new cool in 2023. Many database installations are on Kubernetes now. And this creates challenges for Support engineers because traditional monitoring and diagnostic tools work differently on bare hardware and Kubernetes. In this session, I will focus on differences in methods we use to collect metrics, describe challenges that Percona Support hits when working with database installations on Kubernetes, and discuss how we resolve them. This talk will cover all database technologies we support: MySQL, MongoDB, and PostgreSQL.
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It is very easy to find if a database installation is having issues. You only need to enable Operating System monitoring. A disk, memory, or CPU usage change will alert you about the problems. But they would not show *why* the trouble happens. You need the help of database-specific monitoring tools.
As a Support Engineer, I am always very upset when handling complaints about the database behavior lacking specific database monitoring data because I cannot help!
There are two reasons database and system administrators do not enable necessary instrumentation. The first is a natural or expected performance impact. Second is the lack of knowledge on what needs to be on to resolve a particular issue.
In this talk, I will cover both concerns.
I will show which monitoring instruments will give information on what causes disk, memory, or CPU problems.
I will teach you how to use them.
I will uncover which performance impact these instruments have.
I will use both MySQL command-line client and open-source graphical instrument Percona Monitoring and Management (PMM) for the examples.
MySQL Cookbook: Recipes for Developers
This document provides an overview of the MySQL Cookbook by O'Reilly. It discusses the intended audience of database administrators and developers. It also demonstrates different ways of interacting with MySQL, including through the command line interface, MySQL Shell, and X DevAPI. Examples are provided for common tasks like reading, writing, and updating data in both standard SQL and the object-oriented X DevAPI.
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MySQL performance can be improved by tuning queries, server options, and hardware. Traditionally it was an area of responsibility for three different roles: Development, DBA, and System Administrators. Now DevOps handle these all. But there is a gap. Knowledge gained by MySQL DBAs after years or focusing on a single product is hard to gain when you focus on more than one. This is why I am doing this session. I will show a minimal but most effective set of options to improve MySQL performance. For illustrations, I will use real user stories gained from my Support experience and Percona Kubernetes operators for PXC and MySQL.
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Talk for TestDriven Conf: https://tdconf.ru/2022/abstracts/8763
MySQL Test Framework (MTR) — это фреймворк для регрессионных тестов MySQL. Тесты для него пишут разработчики MySQL и запускаются во время подготовки к новым релизам.
MTR можно использовать и по-другому. Я его использую, чтобы тестировать проблемы, о которых сообщают клиенты, и подтверждать сообщения об ошибках (bug reports) одновременно на нескольких версиях MySQL.
При помощи MTR можно:
* программировать сложные развёртывания;
* тестировать проблему на нескольких версиях MySQL/Percona/MariaDB-серверов при помощи одной команды;
* тестировать несколько одновременных соединений;
* проверять ошибки и возвращаемые значения;
* работать с результатами запросов, хранимыми процедурами и внешними командами.
Тест может быть запущен на любой машине с MySQL-, Percona- или MariaDB-сервером.
Я покажу, как я работаю с MySQL Test Framework, и надеюсь, что вы тоже полюбите этот инструмент.
MySQL Cookbook: Recipes for Your Business
This document provides an overview of different ways to work with MySQL using standard SQL, X DevAPI, and MySQL Shell utilities. It discusses querying, updating, and exporting/importing data using these different approaches. It also covers topics like character encoding, generating summaries, storing errors, and retrieving metadata. Examples are provided to illustrate concepts like selecting, grouping, joining, changing data, common table expressions, and more using SQL and X DevAPI. MySQL Shell utilities for exporting/importing CSV, JSON, and working with collections are also demonstrated.
Introduction into MySQL Query Tuning for Dev[Op]s
Percona Live Online 2021 talk: https://www.percona.com/resources/videos/introduction-mysql-query-tuning-for-devops
In this talk I will show how to get started with MySQL Query Tuning. I will make a short introduction into physical table structure and demonstrate how it may influence query execution time.
Then we will discuss basic query tuning instruments and techniques, mainly EXPLAIN command with its latest variations. You will learn how to understand its output and how to rewrite queries or change table structure to achieve better performance.
Производительность MySQL для DevOps
Talk for the DevOps Pro Moscow 2021: https://www.devopspro.ru/Sveta-Smirnova/
Производительность MySQL можно улучшить при помощи оптимизации запросов, настроек MySQL сервера и железа. Традиционно эти задачи распределялись между тремя ролями: Разработчик, Администратор баз данных и Системный Администратор. Теперь же все эти задачи решает DevOps, что непросто для одного человека. В этом докладе я расскажу об основных оптимизациях, которые решают большинство проблем производительности MySQL. Для иллюстраций я буду использовать реальные пользовательские истории и Percona Kubernetes Operator.
MySQL Performance for DevOps
This document provides an overview of optimizing MySQL performance for DevOps. It discusses hardware configuration including memory, disk, CPU and network. It covers important MySQL configuration options like InnoDB settings. It also discusses query tuning techniques like using indexes to improve query performance.
How to Avoid Pitfalls in Schema Upgrade with Percona XtraDB Cluster
Percona XtraDB Cluster (PXC) is a 100% synchronized cluster in regards to DML operations. It is ensured by the optimistic locking model and ability to rollback transaction which cannot be applied on all nodes. However, DDL operations are not transactional in MySQL. This adds complexity when you need to change the schema of the database.
Changes made by DDL may affect the results of the queries. Therefore all modifications must replicate on all nodes prior to the next data access. For operations that run momentarily, it can be easily achieved, but schema changes may take hours to apply. Therefore in addition to the safest synchronous blocking schema upgrade method: TOI, - PXC supports more relaxed, though not safe, method RSU.
RSU: Rolling Schema Upgrade is advertised to be non-blocking. But you still need to take care of updates, running while you are performing such an upgrade. Surprisingly, even updates on not related tables and schema can cause RSU operation to fail.
In this talk, I will uncover nuances of PXC schema upgrades and point to details you need to take special care about.
Further Information
Schema change is a frequent task, and many do not expect any surprises with it. However, the necessity to replay the changes to all synchronized nodes adds complexity. I made a webinar on a similar topic which was recorded and available for replay. Now I have found that I share a link to the webinar to my Support customers approximately once per week. Not having a good understanding of how schema change works in the cluster leads to lockups and operation failures. This talk will provide a checklist that will help to choose the best schema change method.
Presented at Percona Live Online: https://perconaliveonline2020.sched.com/event/ePm2/how-to-avoid-pitfalls-in-schema-upgrade-with-percona-xtradb-cluster
How to migrate from MySQL to MariaDB without tears
Presented at MariaDB Server Fest 2020: https://mariadb.org/fest2020/migrate-mysql/
MariaDB is a drop-in replacement for MySQL. Initial migration is simple: start MariaDB over the old MySQL datadir.
Later your application may notice that some features work differently than with MySQL. These are MariaDB improvements, so this is good and, likely the reason you migrated.
In this session, I will focus on the differences affecting application performance and behavior. In particular, features sharing the same name, but working differently.
Modern solutions for modern database load: improvements in the latest MariaDB...
Presented at MariaDB Server Fest 2020: https://mariadb.org/fest2020/improvements/
MariaDB is famous for working well in high-performance environments. But our view of what to call high-performance changes over time. Every year we get faster data transfer speed; more devices connected to the Internet; more users and, as a result, more data.
Challenges, which developers have to solve, are getting harder. This session shows what engineers do to keep the product up to date, focusing on MariaDB improvements that make it different from its predecessor, MySQL.
How Safe is Asynchronous Master-Master Setup?
Presented at Percona MySQL Tech Day on September 10, 2020: https://www.percona.com/tech-days#mysql
It is common knowledge that built-in asynchronous active-active replication is not safe. I remember times when the official MySQL User Reference Manual stated that such an installation is not recommended for production use. Some experts repeat this claim even now.
While this statement is generally true, I worked with thousands of shops that successfully avoided asynchronous replication limitations in active-active setups.
In this talk, I will show how they did it, demonstrate situations when asynchronous source-source replication is the best possible high availability option and beats such solutions as Galera or InnoDB Clusters. I will also cover common mistakes, leading to disasters.
Современному хайлоду - современные решения: MySQL 8.0 и улучшения Percona
MySQL всегда использовали под высокой нагрузкой. Недаром эта база была и остаётся самым популярным бэкэндом для web. Однако наши представления о хайлоде с каждым годом расширяются. Большая скорость передачи данных -> больше устройств с подключением к интернет -> больше пользователей -> больше данных.
Задачи, стоящие перед разработчиками MySQL, с каждым годом усложняются.
В этом докладе я расскажу как менялись сценарии использования MySQL за [почти] 25 лет её истории и что делали инженеры, чтобы MySQL оставалась актуальной. Мы затронем такие темы, как работа с большим количеством активных соединений и высокими объёмами данных. Я покажу насколько современные версии лучше справляются с возросшими нагрузками.
Я надеюсь, что после моего доклада те слушатели, которые используют старые версии, захотят обновиться и те, кто уже обновились, узнают как использовать современный MySQL на полную мощность.
Прочитана на конференции OST 2020: https://ostconf.com/materials/2857#2857
How to Avoid Pitfalls in Schema Upgrade with Galera
This document discusses different methods for performing schema upgrades in a Galera cluster, including Total Order Isolation (TOI), Rolling Schema Upgrade (RSU), and the pt-online-schema-change tool. TOI blocks the entire cluster during DDL but ensures consistency, while RSU allows upgrades without blocking the cluster but requires stopping writes and carries risks of inconsistency. Pt-online-schema-change performs non-blocking upgrades using triggers to copy rows to a new table in chunks.
How Safe is Asynchronous Master-Master Setup?
This document discusses the risks of using asynchronous master-master replication for MySQL databases and provides strategies for setting it up safely. It explains that having two nodes actively accepting writes can lead to conflicts like duplicate key errors. It recommends dividing writes across nodes by database, table, or row to avoid conflicts. The document also discusses using synchronous replication tools like Galera to ensure consistency across nodes at the cost of reduced performance.
Introduction to MySQL Query Tuning for Dev[Op]s
To get data, we query the database. MySQL does its best to return requested bytes as fast as possible. However, it needs human help to identify what is important and should be accessed in the first place.
Queries, written smartly, can significantly outperform automatically generated ones. Indexes and Optimizer statistics, not limited to the Histograms only, help to increase the speed of the query a lot.
In this session, I will demonstrate by examples of how MySQL query performance can be improved. I will focus on techniques, accessible by Developers and DevOps rather on those which are usually used by Database Administrators. In the end, I will present troubleshooting tools which will help you to identify why your queries do not perform. Then you could use the knowledge from the beginning of the session to improve them.
Billion Goods in Few Categories: How Histograms Save a Life?
We store data with an intention to use it: search, retrieve, group, sort... To do it effectively the MySQL Optimizer uses index statistics when compiles the query execution plan. This approach works excellently unless your data distribution is not even.
Last year I worked on several tickets where data follow the same pattern: millions of popular products fit into a couple of categories and rest used the rest. We had a hard time to find a solution for retrieving goods fast. We offered workarounds for version 5.7. However new MariaDB and MySQL 8.0 feature: histograms, - would work better, cleaner and faster. The idea of the talk was born.
Of course, histograms are not a panacea and do not help in all situations.
I will discuss:
how index statistics physically stored by the storage engine
which data exchanged with the Optimizer
why it is not enough to make correct index choice
when histograms can help and when they cannot
differences between MySQL and MariaDB histograms
A Billion Goods in a Few Categories: When Optimizer Histograms Help and When ...
Last year this session’s speaker worked on several cases where data followed the same pattern: millions of popular products fit into a couple of categories, and the rest uses the rest. Her team had a hard time finding a solution for retrieving goods quickly. MySQL 8.0 has a feature that resolves such issues: optimizer histograms, storing statistics of an exact number of values in each data bucket. In real life, histograms don’t help with all queries accessing nonuniform data. How you write a statement, the number of rows in the table, data distribution: All of these may affect the use of histograms. This presentation shows examples demonstrating how the optimizer works in each case, describes how to create histograms, and covers differences between MySQL and Oracle implementations.
Что нужно знать о трёх топовых фичах MySQL
MySQL прочно удерживает второе по популярности место после Oracle в рейтинге DB-engines: https://db-engines.com/en/ranking_trend Репликация, табличные движки и поддержка NoSQL не дают MySQL сдавать позиции с 2012 года: года основания рейтинга. Что особенного в этих фичах? Что нужно знать, чтобы использовать их на полную мощность?
Я расскажу про дизайн. Именно он отвечает за то, чтобы ваше приложение не достигло потолка производительности. Понимание архитектуры поможет при проектирование нового приложения, которое впоследствии будет легко масштабироваться.
Доклад рассчитан для начинающих пользователей MySQL. Однако поможет освежить свои знания и более опытным.
Billion Goods in Few Categories: How Histograms Save a Life?
We store data with an intention to use it: search, retrieve, group, sort... To do it effectively, the MySQL Optimizer uses index statistics when it compiles the query execution plan. This approach works excellently unless your data distribution is not even.
Last year I worked on several support tickets where data follows the same pattern: millions of popular products fit into a couple of categories and the rest used the rest. We had a hard time finding a solution for retrieving goods fast. We offered workarounds for version 5.7. However, a new MariaDB and MySQL 8.0 feature - histograms - would work better, cleaner and faster. The idea of the talk was born.
Of course, histograms are not a panacea and do not help in all situations.
I will discuss
- how index statistics physically stored by the storage engine
- which data exchanged with the Optimizer
- why it is not enough to make correct index choice
- when histograms can help and when they cannot
- differences between MySQL and MariaDB histograms
Talk for Percona Live 2019 Austin: https://www.percona.com/live/19/sessions/billion-goods-in-few-categories-how-histograms-save-a-life
MySQL Performance Schema in Action
Performance Schema is a powerful diagnostic instrument for:
- Query performance
- Complicated locking issues
- Memory leaks
- Resource usage
- Problematic behavior, caused by inappropriate settings
- More
It comes with hundreds of options which allow precisely tuning what to instrument. More than 100 consumers store collected data.
In this tutorial, we will try all the important instruments out. We will provide a test environment and a few typical problems which could be hardly solved without Performance Schema. You will not only learn how to collect and use this information but have experience with it.
Tutorial at Percona Live Austin 2019
More Related Content
More from Sveta Smirnova
MySQL Cookbook: Recipes for Developers
This document provides an overview of the MySQL Cookbook by O'Reilly. It discusses the intended audience of database administrators and developers. It also demonstrates different ways of interacting with MySQL, including through the command line interface, MySQL Shell, and X DevAPI. Examples are provided for common tasks like reading, writing, and updating data in both standard SQL and the object-oriented X DevAPI.
MySQL Performance for DevOps
MySQL performance can be improved by tuning queries, server options, and hardware. Traditionally it was an area of responsibility for three different roles: Development, DBA, and System Administrators. Now DevOps handle these all. But there is a gap. Knowledge gained by MySQL DBAs after years or focusing on a single product is hard to gain when you focus on more than one. This is why I am doing this session. I will show a minimal but most effective set of options to improve MySQL performance. For illustrations, I will use real user stories gained from my Support experience and Percona Kubernetes operators for PXC and MySQL.
MySQL Test Framework для поддержки клиентов и верификации багов
Talk for TestDriven Conf: https://tdconf.ru/2022/abstracts/8763
MySQL Test Framework (MTR) — это фреймворк для регрессионных тестов MySQL. Тесты для него пишут разработчики MySQL и запускаются во время подготовки к новым релизам.
MTR можно использовать и по-другому. Я его использую, чтобы тестировать проблемы, о которых сообщают клиенты, и подтверждать сообщения об ошибках (bug reports) одновременно на нескольких версиях MySQL.
При помощи MTR можно:
* программировать сложные развёртывания;
* тестировать проблему на нескольких версиях MySQL/Percona/MariaDB-серверов при помощи одной команды;
* тестировать несколько одновременных соединений;
* проверять ошибки и возвращаемые значения;
* работать с результатами запросов, хранимыми процедурами и внешними командами.
Тест может быть запущен на любой машине с MySQL-, Percona- или MariaDB-сервером.
Я покажу, как я работаю с MySQL Test Framework, и надеюсь, что вы тоже полюбите этот инструмент.
MySQL Cookbook: Recipes for Your Business
This document provides an overview of different ways to work with MySQL using standard SQL, X DevAPI, and MySQL Shell utilities. It discusses querying, updating, and exporting/importing data using these different approaches. It also covers topics like character encoding, generating summaries, storing errors, and retrieving metadata. Examples are provided to illustrate concepts like selecting, grouping, joining, changing data, common table expressions, and more using SQL and X DevAPI. MySQL Shell utilities for exporting/importing CSV, JSON, and working with collections are also demonstrated.
Introduction into MySQL Query Tuning for Dev[Op]s
Percona Live Online 2021 talk: https://www.percona.com/resources/videos/introduction-mysql-query-tuning-for-devops
In this talk I will show how to get started with MySQL Query Tuning. I will make a short introduction into physical table structure and demonstrate how it may influence query execution time.
Then we will discuss basic query tuning instruments and techniques, mainly EXPLAIN command with its latest variations. You will learn how to understand its output and how to rewrite queries or change table structure to achieve better performance.
Производительность MySQL для DevOps
Talk for the DevOps Pro Moscow 2021: https://www.devopspro.ru/Sveta-Smirnova/
Производительность MySQL можно улучшить при помощи оптимизации запросов, настроек MySQL сервера и железа. Традиционно эти задачи распределялись между тремя ролями: Разработчик, Администратор баз данных и Системный Администратор. Теперь же все эти задачи решает DevOps, что непросто для одного человека. В этом докладе я расскажу об основных оптимизациях, которые решают большинство проблем производительности MySQL. Для иллюстраций я буду использовать реальные пользовательские истории и Percona Kubernetes Operator.
MySQL Performance for DevOps
This document provides an overview of optimizing MySQL performance for DevOps. It discusses hardware configuration including memory, disk, CPU and network. It covers important MySQL configuration options like InnoDB settings. It also discusses query tuning techniques like using indexes to improve query performance.
How to Avoid Pitfalls in Schema Upgrade with Percona XtraDB Cluster
Percona XtraDB Cluster (PXC) is a 100% synchronized cluster in regards to DML operations. It is ensured by the optimistic locking model and ability to rollback transaction which cannot be applied on all nodes. However, DDL operations are not transactional in MySQL. This adds complexity when you need to change the schema of the database.
Changes made by DDL may affect the results of the queries. Therefore all modifications must replicate on all nodes prior to the next data access. For operations that run momentarily, it can be easily achieved, but schema changes may take hours to apply. Therefore in addition to the safest synchronous blocking schema upgrade method: TOI, - PXC supports more relaxed, though not safe, method RSU.
RSU: Rolling Schema Upgrade is advertised to be non-blocking. But you still need to take care of updates, running while you are performing such an upgrade. Surprisingly, even updates on not related tables and schema can cause RSU operation to fail.
In this talk, I will uncover nuances of PXC schema upgrades and point to details you need to take special care about.
Further Information
Schema change is a frequent task, and many do not expect any surprises with it. However, the necessity to replay the changes to all synchronized nodes adds complexity. I made a webinar on a similar topic which was recorded and available for replay. Now I have found that I share a link to the webinar to my Support customers approximately once per week. Not having a good understanding of how schema change works in the cluster leads to lockups and operation failures. This talk will provide a checklist that will help to choose the best schema change method.
Presented at Percona Live Online: https://perconaliveonline2020.sched.com/event/ePm2/how-to-avoid-pitfalls-in-schema-upgrade-with-percona-xtradb-cluster
How to migrate from MySQL to MariaDB without tears
Presented at MariaDB Server Fest 2020: https://mariadb.org/fest2020/migrate-mysql/
MariaDB is a drop-in replacement for MySQL. Initial migration is simple: start MariaDB over the old MySQL datadir.
Later your application may notice that some features work differently than with MySQL. These are MariaDB improvements, so this is good and, likely the reason you migrated.
In this session, I will focus on the differences affecting application performance and behavior. In particular, features sharing the same name, but working differently.
Modern solutions for modern database load: improvements in the latest MariaDB...
Presented at MariaDB Server Fest 2020: https://mariadb.org/fest2020/improvements/
MariaDB is famous for working well in high-performance environments. But our view of what to call high-performance changes over time. Every year we get faster data transfer speed; more devices connected to the Internet; more users and, as a result, more data.
Challenges, which developers have to solve, are getting harder. This session shows what engineers do to keep the product up to date, focusing on MariaDB improvements that make it different from its predecessor, MySQL.
How Safe is Asynchronous Master-Master Setup?
Presented at Percona MySQL Tech Day on September 10, 2020: https://www.percona.com/tech-days#mysql
It is common knowledge that built-in asynchronous active-active replication is not safe. I remember times when the official MySQL User Reference Manual stated that such an installation is not recommended for production use. Some experts repeat this claim even now.
While this statement is generally true, I worked with thousands of shops that successfully avoided asynchronous replication limitations in active-active setups.
In this talk, I will show how they did it, demonstrate situations when asynchronous source-source replication is the best possible high availability option and beats such solutions as Galera or InnoDB Clusters. I will also cover common mistakes, leading to disasters.
Современному хайлоду - современные решения: MySQL 8.0 и улучшения Percona
MySQL всегда использовали под высокой нагрузкой. Недаром эта база была и остаётся самым популярным бэкэндом для web. Однако наши представления о хайлоде с каждым годом расширяются. Большая скорость передачи данных -> больше устройств с подключением к интернет -> больше пользователей -> больше данных.
Задачи, стоящие перед разработчиками MySQL, с каждым годом усложняются.
В этом докладе я расскажу как менялись сценарии использования MySQL за [почти] 25 лет её истории и что делали инженеры, чтобы MySQL оставалась актуальной. Мы затронем такие темы, как работа с большим количеством активных соединений и высокими объёмами данных. Я покажу насколько современные версии лучше справляются с возросшими нагрузками.
Я надеюсь, что после моего доклада те слушатели, которые используют старые версии, захотят обновиться и те, кто уже обновились, узнают как использовать современный MySQL на полную мощность.
Прочитана на конференции OST 2020: https://ostconf.com/materials/2857#2857
How to Avoid Pitfalls in Schema Upgrade with Galera
This document discusses different methods for performing schema upgrades in a Galera cluster, including Total Order Isolation (TOI), Rolling Schema Upgrade (RSU), and the pt-online-schema-change tool. TOI blocks the entire cluster during DDL but ensures consistency, while RSU allows upgrades without blocking the cluster but requires stopping writes and carries risks of inconsistency. Pt-online-schema-change performs non-blocking upgrades using triggers to copy rows to a new table in chunks.
How Safe is Asynchronous Master-Master Setup?
This document discusses the risks of using asynchronous master-master replication for MySQL databases and provides strategies for setting it up safely. It explains that having two nodes actively accepting writes can lead to conflicts like duplicate key errors. It recommends dividing writes across nodes by database, table, or row to avoid conflicts. The document also discusses using synchronous replication tools like Galera to ensure consistency across nodes at the cost of reduced performance.
Introduction to MySQL Query Tuning for Dev[Op]s
To get data, we query the database. MySQL does its best to return requested bytes as fast as possible. However, it needs human help to identify what is important and should be accessed in the first place.
Queries, written smartly, can significantly outperform automatically generated ones. Indexes and Optimizer statistics, not limited to the Histograms only, help to increase the speed of the query a lot.
In this session, I will demonstrate by examples of how MySQL query performance can be improved. I will focus on techniques, accessible by Developers and DevOps rather on those which are usually used by Database Administrators. In the end, I will present troubleshooting tools which will help you to identify why your queries do not perform. Then you could use the knowledge from the beginning of the session to improve them.
Billion Goods in Few Categories: How Histograms Save a Life?
We store data with an intention to use it: search, retrieve, group, sort... To do it effectively the MySQL Optimizer uses index statistics when compiles the query execution plan. This approach works excellently unless your data distribution is not even.
Last year I worked on several tickets where data follow the same pattern: millions of popular products fit into a couple of categories and rest used the rest. We had a hard time to find a solution for retrieving goods fast. We offered workarounds for version 5.7. However new MariaDB and MySQL 8.0 feature: histograms, - would work better, cleaner and faster. The idea of the talk was born.
Of course, histograms are not a panacea and do not help in all situations.
I will discuss:
how index statistics physically stored by the storage engine
which data exchanged with the Optimizer
why it is not enough to make correct index choice
when histograms can help and when they cannot
differences between MySQL and MariaDB histograms
A Billion Goods in a Few Categories: When Optimizer Histograms Help and When ...
Last year this session’s speaker worked on several cases where data followed the same pattern: millions of popular products fit into a couple of categories, and the rest uses the rest. Her team had a hard time finding a solution for retrieving goods quickly. MySQL 8.0 has a feature that resolves such issues: optimizer histograms, storing statistics of an exact number of values in each data bucket. In real life, histograms don’t help with all queries accessing nonuniform data. How you write a statement, the number of rows in the table, data distribution: All of these may affect the use of histograms. This presentation shows examples demonstrating how the optimizer works in each case, describes how to create histograms, and covers differences between MySQL and Oracle implementations.
Что нужно знать о трёх топовых фичах MySQL
MySQL прочно удерживает второе по популярности место после Oracle в рейтинге DB-engines: https://db-engines.com/en/ranking_trend Репликация, табличные движки и поддержка NoSQL не дают MySQL сдавать позиции с 2012 года: года основания рейтинга. Что особенного в этих фичах? Что нужно знать, чтобы использовать их на полную мощность?
Я расскажу про дизайн. Именно он отвечает за то, чтобы ваше приложение не достигло потолка производительности. Понимание архитектуры поможет при проектирование нового приложения, которое впоследствии будет легко масштабироваться.
Доклад рассчитан для начинающих пользователей MySQL. Однако поможет освежить свои знания и более опытным.
Billion Goods in Few Categories: How Histograms Save a Life?
We store data with an intention to use it: search, retrieve, group, sort... To do it effectively, the MySQL Optimizer uses index statistics when it compiles the query execution plan. This approach works excellently unless your data distribution is not even.
Last year I worked on several support tickets where data follows the same pattern: millions of popular products fit into a couple of categories and the rest used the rest. We had a hard time finding a solution for retrieving goods fast. We offered workarounds for version 5.7. However, a new MariaDB and MySQL 8.0 feature - histograms - would work better, cleaner and faster. The idea of the talk was born.
Of course, histograms are not a panacea and do not help in all situations.
I will discuss
- how index statistics physically stored by the storage engine
- which data exchanged with the Optimizer
- why it is not enough to make correct index choice
- when histograms can help and when they cannot
- differences between MySQL and MariaDB histograms
Talk for Percona Live 2019 Austin: https://www.percona.com/live/19/sessions/billion-goods-in-few-categories-how-histograms-save-a-life
MySQL Performance Schema in Action
Performance Schema is a powerful diagnostic instrument for:
- Query performance
- Complicated locking issues
- Memory leaks
- Resource usage
- Problematic behavior, caused by inappropriate settings
- More
It comes with hundreds of options which allow precisely tuning what to instrument. More than 100 consumers store collected data.
In this tutorial, we will try all the important instruments out. We will provide a test environment and a few typical problems which could be hardly solved without Performance Schema. You will not only learn how to collect and use this information but have experience with it.
Tutorial at Percona Live Austin 2019
More from Sveta Smirnova (20)
MySQL Test Framework для поддержки клиентов и верификации багов
MySQL Test Framework для поддержки клиентов и верификации багов
How to Avoid Pitfalls in Schema Upgrade with Percona XtraDB Cluster
How to Avoid Pitfalls in Schema Upgrade with Percona XtraDB Cluster
How to migrate from MySQL to MariaDB without tears
How to migrate from MySQL to MariaDB without tears
Modern solutions for modern database load: improvements in the latest MariaDB...
Modern solutions for modern database load: improvements in the latest MariaDB...
Современному хайлоду - современные решения: MySQL 8.0 и улучшения Percona
Современному хайлоду - современные решения: MySQL 8.0 и улучшения Percona
How to Avoid Pitfalls in Schema Upgrade with Galera
How to Avoid Pitfalls in Schema Upgrade with Galera
Billion Goods in Few Categories: How Histograms Save a Life?
Billion Goods in Few Categories: How Histograms Save a Life?
A Billion Goods in a Few Categories: When Optimizer Histograms Help and When ...
A Billion Goods in a Few Categories: When Optimizer Histograms Help and When ...
Billion Goods in Few Categories: How Histograms Save a Life?
Billion Goods in Few Categories: How Histograms Save a Life?
San Francisco - 2015
- 1. San Francisco - 2015 Sveta Smirnova / Света Смирнова April, 12, 2015 12 апреля 2015
- 3. Cozy place Уютный уголок Rahat bir yer 2
- 4. Small ship or big gates? Маленький корабль или большие ворота? Ku¸cuk gemi veya b¨uy¨uk kapılar? 3
- 5. I must visit the tower. This year too Нужно сходить на башню. В этом году тоже Mecburum kulede gitmek. Bu sene ayrıca 4
- 6. Tower view Вид с башни Kule g¨or¨un¨um¨u 5
- 7. No fog today Сегодня нет тумана B¨ug¨un sis yok 6
- 8. Ocean view Вид на океан Okyanus manzara 7
- 10. Business district Деловой центр I¸s b¨olgesi 9
- 11. SF is big! Сан Франциско большой! San Francisco b¨uy¨uk! 10
- 12. At all sides Во все стороны Her taraftan da 11
- 13. Little island is Alcatraz: the prison and the museum. We will go there few days later Маленький остров - это Алькатрас: тюрьма-музей. Мы туда поедем через несколько дней K¨u¸c¨uk ada - Alcatraz: hapishane-m¨uze. Biz orada birka¸c g¨un gelece˘giz 12
- 14. You can look at the sky from the tower Вид с башни открывается и на небо Kule g¨oky¨uz¨u manzara 13
- 15. Path to the tower secured by fox Путь к башне охраняют лисы Kule yol tilki koruyorlar 14
- 16. We need to go down back Нам отсюда предстоит спуститься Inmek yapmalıyız 15
- 17. The proof what USA has own chocolate factories Доказательство, что шоколадные фабрики в США существуют Kanıt ABD ¸cikolata fabrikalar var 16
- 18. Time to leave! Пора домой! Gitme zamanı! 17