система Я расскажу 01 Почему ClickHouse — плохая система 02 И что с этим делать 03 3 Impala Spark SQL Presto/Trino Drill Actian Vortex Kylin Kudu MonetDB Actian Vector Actian Matrix Redshift Greenplum OmniSci (mapD) Brytlyt HyPER Pinot kdb+ Shakti MemSQL (SingleStore) Vertica SAP HANA Sybase IQ MS SQL with CS index Oracle Exadata IBM Netezza, IBM BLU TiDB Hawq Vectorwise Snowflake Citus Druid аутентификация • Все доступные средства тестирования в CI ClickHouse — удобная система 7 Язык SQL, адаптированный для удобства аналитики: • Алиасы в любом месте запроса • Массивы, кортежи, лямбда

16G ，最好本值超 1024M innodb_flush_log_at_trx _commit 1 0 0 代表日志只大约每秒写入日志文件并且日志文件 刷新到磁盘 ; 1 为执行完没执行一条 SQL 马上 commit; 2 代表日志写入日志文件在每次提交 后 , 但是日志文件只有大约每秒才会刷新到磁盘上 . 对速度影响比较大，同时也关系数据完整性 innodb_log_file_size 设计合理的数据表结构：适当的数据冗余 设计合理的数据表结构：适当的数据冗余  对数据表建立合适有效的数据库索引 对数据表建立合适有效的数据库索引  数据查询：编写简洁高效的 数据查询：编写简洁高效的 SQL SQL 语句 语句 应用优化 应用优化 应用优化方式 应用优化方式 应用优化 应用优化 表结构设计原则 表结构设计原则 选择字段的一般原则是保小不保大，能用占用字节 少的字段就不用大字段。比如，主键，强烈建议用 date/tim date/tim e e 等 等 类型的字段建立索引 类型的字段建立索引  需要的时候建立联合索引，但是要注意查询 需要的时候建立联合索引，但是要注意查询 SQL SQL 语句的编写 语句的编写  谨慎建立 谨慎建立 unique unique 类型的索引（唯一索引） 类型的索引（唯一索引）  大文本字段不建立为索引，如果要对大文本字段进行检索，

Rust 开发的分布式存储引 擎及图计算引擎，精细的内存 管理设计，内置索引系统，支 持毫秒级的并发查询响应速度 易用 AQL(Atlas Graph Query Language) ，类 SQL 的图查询 语言，内置上百种分析函数， 面向分析师友好，拥抱标准， 基于 openCypher 向 ISO GQL 迈进 实时大图 支持万亿节点存储及流式计算 引擎的结合，最新数据实时入 库构图，为在线业务决策分析 Standard • Incorporate by reference specifications from SQL/Framework and SQL/Foundation • Capabilities needed by both SQL/PGQ (Property Graph Queries in SQL) and the GQL standard • GQL Specific Capabilities International Standard) Ballot starts •2023-11 – DIS ballot ends •2024-04 – International Standard 类 SQL 语言，简单易用，面向分析师友好 查询引擎：计算请求执行流程 Cypher AST Unresolved Logical Plan Logical Plan Optimized Logical

@TartanLlama C++ Product Team, Microsoft @VisualC https://aka.ms/cpp Welcome to CppCon 2021! Join #visual_studio channel on CppCon Discord https://aka.ms/cppcon/discord • Meet the Microsoft C++ team • Ask any any questions • Discuss the latest announcements Take our survey https://aka.ms/cppcon 🚀 Mission of the C++ product team at Microsoft Empower every C++ developer and their teams to achieve more 1. CMake, vcpkg and git integrations SSH/container/WSL remote experiences and much much more… https://aka.ms/cpp/code Thu 10/28 – 2pm An Editor Can Do That? Debugging Assembly Language and GPU Kernels in Visual

20 Clickhouse/ClickTail Setup • Install Schema • cat schema/db.sql | clickhouse-client –multiline • cat schema/mysqlaudit.sql | clickhouse-client –multiline • Configure ClickTail • [Required Options] Percona. 26 Clickhouse/ClickTail Setup • Install Schema • cat schema/db.sql | clickhouse-client –multiline • cat schema/mysql.sql | clickhouse-client –multiline • Configure ClickTail • [Required Options]

ratio<12>>>;16 Durations – Predefined & Literals  Standard user-defined duration literals:  h, min, s, ms, us, and ns  Require any of the following using directives: using namespace std; using namespace }; // Convert difference into milliseconds. cout << duration { diff }.count() << "ms";23 Agenda  Compile-Time Rational Numbers  Durations  Clocks  Time Points  Dates  Time time_since_epoch().count() << "ms"; // 42000ms27 Time Points  Explicit conversions  Example: milliseconds -> seconds time_point tpMilliseconds { 42’016ms }; // Convert milliseconds

on CppCon Discord https://aka.ms/cppcon/discord • Meet the Microsoft C++ team • Ask any questions • Discuss the latest announcements Take our survey https://aka.ms/cppconAgenda • Intro to path-sensitive on CppCon Discord https://aka.ms/cppcon/discord • Meet the Microsoft C++ team • Ask any questions • Discuss the latest announcements Take our survey https://aka.ms/cppconOur Sessions Monday 25th

on CppCon Discord https://aka.ms/cppcon/discord • Meet the Microsoft C++ team • Ask any questions • Discuss the latest announcements Take our survey https://aka.ms/cppcon4 Before we begin... • on CppCon Discord https://aka.ms/cppcon/discord • Meet the Microsoft C++ team • Ask any questions • Discuss the latest announcements Take our survey https://aka.ms/cppconOur Sessions Monday 25th

подходит ClickHouse › Интерактивные запросы по данным, обновляемым в реальном времени › Диалект SQL + расширения › Стараемся заранее ничего не агрегировать › Нужны очищенные структурированные данные зрения CAP–теоремы Всё вместе › Column–oriented › Сверхбыстрые интерактивные запросы › Диалект SQL + расширения › Плохо подходит для OLTP, Key–Value, хранения блобов › Линейная масштабируемость ›

Clickhouse Mutation Trouble Shoot ● SQL is too big(max_ast_elements, max_expanded_ast_elements) ● Mutations are stuck (KILL MUTATION) ● Zookeeper OOM because of SQL length (Put ids in a Memory Engine temp