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Technical Articles

Database

Redis Deep Dive: Performance Tuning & Optimization Techniques

Redis performance optimization can be achieved through the following steps: 1. Configuration adjustment: Set maxmemory, maxmemory-policy and appendfsync parameters. 2. Data structure selection: Select the appropriate data structure, such as strings, hash tables or collections, according to the data access mode. 3. Command optimization: Avoid using high-complexity commands such as KEYS and use SCAN instead. 4. Use Pipeline to reduce network overhead, 5. Implement sharding to improve overall performance, 6. Use cache reasonably to optimize application response speed, 7. Apply data expiration strategies, monitoring and code optimization to ensure efficiency and stability.

Apr 03, 2025 am 12:09 AM

How does index cardinality affect query performance in MySQL?

Index cardinality has a significant impact on MySQL query performance. High cardinality indexes can locate data faster and optimize queries; low cardinality indexes may lead to full table scanning. Query performance can be effectively improved by regularly updating statistics, selecting the appropriate index type, avoiding over-index and using over-index.

Apr 03, 2025 am 12:09 AM

MySQL性能索引基数

Is Navicat a tool?

Navicat is a tool, a powerful database management tool developed by PremiumSoft, supporting multiple database systems. Its core functions include database connection, data query, data import and export, SQL editing and execution, etc., and also provide advanced functions such as data model design, data synchronization and backup and recovery.

Apr 03, 2025 am 12:07 AM

navicat 数据库工具

Oracle PL/SQL Deep Dive: Mastering Procedures, Functions & Packages

The procedures, functions and packages in OraclePL/SQL are used to perform operations, return values and organize code, respectively. 1. The process is used to perform operations such as outputting greetings. 2. The function is used to calculate and return a value, such as calculating the sum of two numbers. 3. Packages are used to organize relevant elements and improve the modularity and maintainability of the code, such as packages that manage inventory.

Apr 03, 2025 am 12:03 AM

Oracle PL/SQL

How does connection pooling improve MySQL performance?

Connection pooling can significantly improve MySQL performance. 1) It reduces the number of connection creation and closing times by pre-creating and maintaining a set of connections. 2) Initialize the connection pool when the application starts, get the connection from the pool when requested, and return it after use. 3) Configuring the connection pool size, setting timeouts and health checks, managing transactions, and ensuring code readability and maintenance are best practices for implementation.

Apr 03, 2025 am 12:02 AM

MySQL性能连接池

SQL with Python/R: Integrating Databases for Advanced Analytics

The integration of SQL and Python/R can be implemented through libraries and APIs. 1) In Python, use the sqlite3 library to connect to the database and execute queries. 2) In R, use DBI and RSQLite packages to perform similar operations. Mastering these technologies can improve data processing capabilities.

Apr 03, 2025 am 12:02 AM

SQL Python/R

What is the MySQL Slow Query Log and how do you use it effectively?

MySQLSlowQueryLog is a tool for recording queries whose execution time exceeds a set threshold. 1) Enable slow query logs and set thresholds; 2) View slow query log files; 3) Use mysqldumpslow tool to analyze slow queries; 4) Clean the log files regularly and adjust the thresholds; 5) Improve database performance by analyzing logs and using indexes.

Apr 03, 2025 am 12:01 AM

性能调优

Explain MySQL semi-synchronous replication.

MySQL semi-synchronous replication balances data consistency and performance by waiting for at least one slave library to confirm before the master library returns to the client. 1) Enable semi-synchronous replication on the main library: SETGLOBALrpl_semi_sync_master_enabled=1;2) Enable semi-synchronous replication on the slave library: SETGLOBALrpl_semi_sync_slave_enabled=1; This method not only improves data consistency, but does not seriously affect performance like synchronous replication.

Apr 02, 2025 pm 07:21 PM

数据库复制

How do you detect and handle deadlocks in MySQL?

Methods for detecting and handling deadlocks in MySQL include: 1. Use the SHOWENGINEINNODBSTATUS command to view deadlock information; 2. Use the data_locks table of performance Schema to monitor the lock status; 3. Ensure that transactions acquire locks in the same order to avoid holding locks for a long time; 4. Optimize transaction design and lock strategies, and adjust the deadlock detection switch if necessary.

Apr 02, 2025 pm 07:13 PM

死锁处理 MySQL死锁

Explain different types of MySQL indexes (B-Tree, Hash, Full-text, Spatial).

MySQL supports four index types: B-Tree, Hash, Full-text, and Spatial. 1.B-Tree index is suitable for equal value search, range query and sorting. 2. Hash index is suitable for equal value searches, but does not support range query and sorting. 3. Full-text index is used for full-text search and is suitable for processing large amounts of text data. 4. Spatial index is used for geospatial data query and is suitable for GIS applications.

Apr 02, 2025 pm 07:05 PM

MySQL索引索引类型

Difference between clustered index and non-clustered index (secondary index) in InnoDB.

The difference between clustered index and non-clustered index is: 1. Clustered index stores data rows in the index structure, which is suitable for querying by primary key and range. 2. The non-clustered index stores index key values and pointers to data rows, and is suitable for non-primary key column queries.

Apr 02, 2025 pm 06:25 PM

索引类型 InnoDB索引

Which databases have you worked with using Navicat Premium?

The article discusses the use of Navicat Premium for managing various databases like MySQL, PostgreSQL, Oracle, and SQL Server, highlighting its features and productivity benefits. It also addresses challenges faced, such as compatibility issues and

Apr 02, 2025 pm 06:13 PM

Explain InnoDB Full-Text Search capabilities.

InnoDB's full-text search capabilities are very powerful, which can significantly improve database query efficiency and ability to process large amounts of text data. 1) InnoDB implements full-text search through inverted indexing, supporting basic and advanced search queries. 2) Use MATCH and AGAINST keywords to search, support Boolean mode and phrase search. 3) Optimization methods include using word segmentation technology, periodic rebuilding of indexes and adjusting cache size to improve performance and accuracy.

Apr 02, 2025 pm 06:09 PM

innodb 全文搜索

phpMyAdmin Automation: Scripting and Customization for Advanced Users

How to make phpMyAdmin more automated and personalized? It can be achieved through the following steps: 1. Use SQL or PHP scripts to automate general tasks, such as database backup and report generation; 2. Customize by modifying configuration files and interfaces to improve user experience and work efficiency.

Apr 02, 2025 pm 02:14 PM

数据库自动化