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Aikesheng Open Source Community
Aikesheng Open Source Community
Mar 26, 2024 · Databases

MySQL 8.0.22 READ ONLY Database Feature: Overview, Usage, Query Methods, Limitations and Exceptions

This article explains the MySQL 8.0.22 READ ONLY option for individual databases, demonstrates how to enable and verify the read‑only state with ALTER DATABASE and SHOW CREATE DATABASE commands, shows the impact on DDL/DML operations, lists usage restrictions, and notes exceptional cases and backup considerations.

ALTER DATABASEInformation SchemaSQL
0 likes · 11 min read
MySQL 8.0.22 READ ONLY Database Feature: Overview, Usage, Query Methods, Limitations and Exceptions
Alibaba Cloud Big Data AI Platform
Alibaba Cloud Big Data AI Platform
Oct 9, 2023 · Big Data

How We Cut MaxCompute Costs Using Information Schema Insights

This article details how a fast‑growing HR SaaS company analyzed MaxCompute billing spikes, identified five key cost drivers, leveraged tenant‑level Information Schema to extract task metadata, applied SQL‑based cost formulas, and implemented targeted optimizations that stabilized their cloud data‑processing expenses.

Big DataCost OptimizationInformation Schema
0 likes · 10 min read
How We Cut MaxCompute Costs Using Information Schema Insights
Aikesheng Open Source Community
Aikesheng Open Source Community
Aug 2, 2023 · Databases

Real‑time Update of AUTO_INCREMENT in INFORMATION_SCHEMA.TABLES on MySQL 8.0

This article explains how MySQL 8.0 updates the AUTO_INCREMENT column in INFORMATION_SCHEMA.TABLES, describes the underlying statistics caching mechanism, shows how the information_schema_stats_expiry parameter controls refresh frequency, and provides step‑by‑step tests demonstrating real‑time behavior with code examples.

AUTO_INCREMENTInformation Schemamysql
0 likes · 10 min read
Real‑time Update of AUTO_INCREMENT in INFORMATION_SCHEMA.TABLES on MySQL 8.0
Aikesheng Open Source Community
Aikesheng Open Source Community
Jan 10, 2022 · Databases

Analysis of MySQL 8.0.26 Crash Caused by the terminology_use_previous Parameter and INFORMATION_SCHEMA.PROCESSLIST Access

The article investigates a MySQL 8.0.26 crash triggered by setting the terminology_use_previous parameter to BEFORE_8_0_26, analyzes stack traces and core dumps, compares processlist access methods, references related bugs, and offers mitigation recommendations for monitoring tools.

Information SchemaPerformance Schemamysql
0 likes · 12 min read
Analysis of MySQL 8.0.26 Crash Caused by the terminology_use_previous Parameter and INFORMATION_SCHEMA.PROCESSLIST Access
Aikesheng Open Source Community
Aikesheng Open Source Community
Nov 20, 2020 · Databases

Optimizing a Slow MySQL 5.7 Query for Detecting Tables Without Primary or Unique Keys

This article examines why a MySQL 5.7 query that finds tables lacking primary or unique keys runs extremely slowly, demonstrates an experiment reproducing the issue, analyzes the optimizer's subquery rewrite, and shows how adding hints and materialization reduces execution time from over 16 seconds to under one second.

Information SchemaSubquerymysql
0 likes · 4 min read
Optimizing a Slow MySQL 5.7 Query for Detecting Tables Without Primary or Unique Keys
Aikesheng Open Source Community
Aikesheng Open Source Community
Aug 30, 2019 · Databases

Determining MySQL Table Disk Usage with INFORMATION_SCHEMA and INNODB_SYS_TABLESPACES

This article explains why retrieving a MySQL table's on‑disk size via INFORMATION_SCHEMA.TABLES is unreliable, describes the impact of storage engines and row formats, and shows how to obtain accurate sizes by querying INNODB_SYS_TABLESPACES, including considerations for compression and configuration settings.

Information Schemadisk spacemysql
0 likes · 6 min read
Determining MySQL Table Disk Usage with INFORMATION_SCHEMA and INNODB_SYS_TABLESPACES