Максим Кита Старший разработчик ClickHouse C++ zero-cost abstractions на примере хеш-таблиц в ClickHouse Введение в хеш-таблицы Содержание 01 Основные вопросы дизайна 02 Бенчмарки 03 C++ дизайн

in another city. This solution has the disadvantages of low resource utilization, high maintenance cost, and the fact that RTO (Recovery Time Objective) and RPO (Recovery Point Objective) cannot meet expectations The solution is to use sharding middleware or a NewSQL database (like TiDB), and the latter is more cost-effective. TiDB adopts a separate computing and storage architecture, which enables you to scale out With a small amount of extra storage cost, you can handle both online transactional processing and real-time data analysis in the same system, which greatly saves the cost. • Data aggregation and secondary

in another city. This solution has the disadvantages of low resource utilization, high maintenance cost, and the fact that RTO (Recovery Time Objective) and RPO (Recovery Point Objective) cannot meet expectations The solution is to use sharding middleware or a NewSQL database (like TiDB), and the latter is more cost-effective. TiDB adopts a separate computing and storage architecture, which enables you to scale out With a small amount of extra storage cost, you can handle both online transactional processing and real-time data analysis in the same system, which greatly saves the cost. • Data aggregation and secondary

in another city. This solution has the disadvantages of low resource utilization, high maintenance cost, and the fact that RTO (Recovery Time Objective) and RPO (Recovery Point Objective) cannot meet expectations The solution is to use sharding middleware or a NewSQL database (like TiDB), and the latter is more cost-effective. TiDB adopts a separate computing and storage architecture, which enables you to scale out With a small amount of extra storage cost, you can handle both online transactional processing and real-time data analysis in the same system, which greatly saves the cost. • Data aggregation and secondary

standalone databases cannot meet the data capacity requirements of rapidly growing applications. TiDB is a cost-effective solution that adopts a separate comput- ing and storage architecture, enabling easy scaling With a small amount of extra storage cost, you can handle both online transactional processing and real-time data analysis in the same system, which greatly saves cost. • Data aggregation and secondary adding �→ flexibility and cost savings. Operations like ADD INDEX �→ and IMPORT INTO will be faster, more resilient, more �→ stable, more flexible, and cost less to run.

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standalone databases cannot meet the data capacity requirements of rapidly growing applications. TiDB is a cost-effective solution that adopts a separate comput- ing and storage architecture, enabling easy scaling With a small amount of extra storage cost, you can handle both online transactional processing and real-time data analysis in the same system, which greatly saves cost. • Data aggregation and secondary TiFlash logger. �→ level �→ Modified Changes the default value from "debug" to "INFO" to reduce the cost of logging. TiDB Light- ning tidb.pd �→ - �→ addr Modified Configures the ad- dresses of the PD

standalone databases cannot meet the data capacity requirements of rapidly growing applications. TiDB is a cost-effective solution that adopts a separate comput- ing and storage architecture, enabling easy scaling With a small amount of extra storage cost, you can handle both online transactional processing and real-time data analysis in the same system, which greatly saves cost. • Data aggregation and secondary Lightning’s logical import mode will use prepared statements and client statement cache. This reduces the cost of TiDB SQL parsing and compilation, improves SQL execution efficiency, and increases the likelihood

standalone databases cannot meet the data capacity requirements of rapidly growing applications. TiDB is a cost-effective solution that adopts a separate comput- ing and storage architecture, enabling easy scaling With a small amount of extra storage cost, you can handle both online transactional processing and real-time data analysis in the same system, which greatly saves cost. • Data aggregation and secondary Lightning’s logical import mode will use prepared statements and client statement cache. This reduces the cost of TiDB SQL parsing and compilation, improves SQL execution efficiency, and increases the likelihood

standalone databases cannot meet the data capacity requirements of rapidly growing applications. TiDB is a cost-effective solution that adopts a separate comput- ing and storage architecture, enabling easy scaling With a small amount of extra storage cost, you can handle both online transactional processing and real-time data analysis in the same system, which greatly saves cost. • Data aggregation and secondary automatic ANALYZE tasks that are running outside the set time window #55283 @hawkingrei • Adjust estimation results from 0 to 1 for equality conditions that do not hit TopN when statistics are entirely composed

standalone databases cannot meet the data capacity requirements of rapidly growing applications. TiDB is a cost-effective solution that adopts a separate comput- ing and storage architecture, enabling easy scaling With a small amount of extra storage cost, you can handle both online transactional processing and real-time data analysis in the same system, which greatly saves cost. • Data aggregation and secondary utilization.