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Technical Articles

Database

Describe different caching strategies (e.g., Opcode, Data, Page) you can use to scale a PHP application.

Opcodecaching,likeOPcache,storesprecompiledPHPbytecodetoreduceparsingandCPUoverhead,andshouldbeenabledinproductionwithpropermemoryandfilelimits.2.DatacachingusingRedisorMemcachedstoresresultsofexpensiveoperationssuchasdatabasequeriesorAPIresponses,us

Aug 11, 2025 pm 11:01 PM

How to fix database connection errors in WordPress

When encountering WordPress database connection errors, the most common reason is that the database cannot be accessed normally. You can troubleshoot through the following steps: 1. Check whether the database name, user name, password and DB_HOST in the wp-config.php file are correct, especially if the host is replaced or the settings may not be updated; 2. Confirm whether the database service is running normally, check the database status through the control panel, phpMyAdmin or the command line; 3. Clear the cache and check plug-in conflicts, clear all types of caches and disable plug-ins to check one by one; 4. Check whether the database is corrupt, and try to repair the table structure using phpMyAdmin or the built-in repair function of the system.

Aug 11, 2025 pm 02:53 PM

Database connection error

Implementation of automatic update of web content based on date and time: PHP and database driver solution

This article explains in detail how to use PHP to achieve dynamic content updates based on date and time on web pages, especially suitable for scenarios such as radio program schedules. The article covers the use of simple conditional judgment, scheduling based on PHP arrays to more advanced methods combined with SQL databases, and provides corresponding code examples and practical considerations, aiming to help developers choose the most appropriate implementation solution according to their needs.

Aug 05, 2025 pm 10:18 PM

Tutorial on automatic update of web content based on date and time

This article details how to automatically update the displayed content on the web page according to the current date and time, especially for scenes such as radio program lists. The tutorial covers three main implementation methods: simple logic based on PHP conditional judgment, using PHP array to manage program lists, and a more flexible and powerful database driver solution. Through code examples and detailed explanations, readers can master dynamic content display technology in different scenarios, and discuss best practices such as time zone setting and performance optimization.

Aug 05, 2025 pm 10:09 PM

Automatic update of web content based on date and time: Taking radio program schedule as an example

This article aims to provide a complete set of tutorials to guide how to use PHP and database technology to achieve automatic date and time updates of web content, especially for scenarios such as radio program schedules that require precise time control. The tutorial will cover a variety of methods from simple conditional judgment to managing programs using arrays to dynamic content management in combination with databases, and provide detailed code examples and practical suggestions to ensure that the content can be displayed dynamically based on current time.

Aug 05, 2025 pm 09:54 PM

Optimizing MySQL for E-commerce Product Search

TooptimizeproductsearchinMySQL,usetherightindexingstrategybyaddingindexesonsearchablecolumnslikeproduct_name,category_id,brand_id,orprice,andconsidercompositeindexesformultiplefilters.Avoidover-indexingtopreventwriteoverhead.Structurequeriesefficient

Aug 05, 2025 pm 03:48 PM

How to optimize WordPress database performance

When WordPress databases run slowly, you can improve performance by regularly cleaning up junk data, optimizing table structure and indexing, enabling caching mechanisms, and adjusting database server configuration. 1. Regularly clean up spam data, such as article revisions, drafts, spam comments, etc. You can use plug-ins or manually execute SQL statements to delete it. It is recommended to once a month. 2. Optimize the database table structure and index, add indexes to high-frequency query fields (such as wp_postmeta's meta_key) to improve query efficiency, but avoid excessive indexing affecting write performance. 3. Enable the cache mechanism, such as object cache (Redis/Memcached) or use the cache plug-in (W3TotalCache/WPSuperCache), and cooperate with C

Aug 05, 2025 am 06:51 AM

Database optimization

How to Optimize MySQL Server Settings for High Traffic Websites?

TunekeyMySQLconfigurationvariablesbyadjustinginnodb_buffer_pool_sizeto70%ofRAMandsettinginnodb_buffer_pool_instancesto8forconcurrency,2.optimizeschemaandindexesusingproperdatatypes,strategicindexing,andenablinginnodb_file_per_table,3.enableslowqueryl

Aug 04, 2025 pm 01:25 PM

Building a Scalable E-commerce Product Catalog with MongoDB

Useaflexibledocumentschemawithembeddedattributesandvariantstoaccommodatediverseproducttypeswithoutjoins.2.Createtargetedindexessuchascompound,text,anduniqueindexesonfieldslikecategory,brand,name,SKU,andinStocktoenablefastqueries.3.Scalehorizontallyus

Aug 03, 2025 am 06:11 AM

mongodb E-commerce

How to configure the MySQL query cache for performance?

First, confirm that the MySQL version supports query cache (only supported by 5.7 and earlier versions), and check have_query_cache, query_cache_type and query_cache_size through SHOWVARIABLES to ensure that they are available and enabled; 2. Set query_cache_size reasonably, and it is recommended that the OLTP system use 64MB to 256MB to avoid memory fragmentation or contention due to excessive size; 3. Use query_cache_type=2 (DEMAND mode), and only cache high-frequency queries that clearly mark SQL_CACHE to avoid resource waste; 4. Adjust query_cache_min_

Aug 03, 2025 am 04:33 AM

Performance Optimization Strategies for Large Multidimensional Arrays in PHP

UseappropriatedatastructureslikeSplFixedArrayfor1Dinteger-keyedarraysandavoiddeepnesting;2.Minimizememoryusagebypassingarraysbyreference,unsettinglargearrays,andusinggenerators;3.Optimizeiterationbycachingarraysizesandreorganizingdataforbetteraccessl

Aug 03, 2025 am 03:52 AM

PHP Multidimensional Arrays

How to Optimize MySQL Queries for Faster Performance?

UseproperindexingstrategicallybycreatingindexesoncolumnsinWHERE,JOIN,ORDERBY,andGROUPBYclauses,suchasindexingtheemailcolumnforfasterlookups,andapplyingcompositeindexeslikeidx_user_statuson(user_id,status)whilerespectingleftmostprefixrules,butavoidove

Aug 02, 2025 am 06:13 AM

Understanding MySQL Query Cache Limitations and Alternatives

The reasons why MySQL query cache effect is not obvious include: 1. Only effective for exactly the same SQL, and different spaces or case are considered as new queries; 2. Each time the table has a write operation, the relevant cache will be cleared, and the hit rate is low in frequent read and write scenarios; 3. The cache efficiency depends on the usage mode, which is only suitable for scenarios where there are fewer data changes and many repeated queries. Alternative solutions include: 1. Application-layer cache (such as Redis), which controls fine granularity but requires management of life cycle; 2. Proxy-layer cache (such as ProxySQL), which supports flexible and regular configuration; 3. Optimize SQL and indexes to fundamentally improve performance. You can judge the cache efficiency by viewing the Qcache status indicators. If the number of hits is much lower than the number of inserts, you should consider disabling it.

Aug 01, 2025 am 06:51 AM

Building High-Performance REST APIs in Go

UsealightweightrouterlikeChiforfastroutingwithradixtreeefficiency.2.OptimizeJSONhandlingbyusingproperstructtags,avoidingmap[string]interface{},andconsideringjsoniterforbetterperformance.3.Leverageconcurrencywiselywithgoroutinesfornon-blockingtasks,us

Aug 01, 2025 am 04:10 AM