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Technical Articles

Database

How to increase the execution time limit in phpMyAdmin

To solve the problem of phpMyAdmin execution time limit, you need to adjust the PHP configuration: 1. Edit the php.ini file, add the values ??of max_execution_time, max_input_time, memory_limit, upload_max_filesize and post_max_size, and restart the web server and PHP service; 2. If you use Apache and cannot modify php.ini, you can add the php_value command to set the relevant parameters in the .htaccess file of the phpMyAdmin directory, provided that AllowOverride is enabled and PHP is Apache module.

Sep 12, 2025 am 02:57 AM

執(zhí)行時(shí)間限制

SQL Server Policy-Based Management

Policy-BasedManagement (PBM) is a centralized management feature of SQLServer for unified configuration and compliance checks. It evaluates whether the database environment complies with specifications by defining conditions, policies, and objectives, and supports manual or automatic evaluation. The creation of a policy must be completed in sequence: 1. Create conditions, specify object types and attributes; 2. Create policies, bind conditions and set evaluation mode; 3. Perform evaluation and check compliance. Common application scenarios include security compliance, configuration consistency, performance optimization, and naming specification verification. Automated execution can be achieved by setting up scheduled tasks or job calls system stored procedures, or it can be batch-running evaluation and output reports in conjunction with PowerShell scripts. It should be noted that

Sep 12, 2025 am 02:40 AM

How to delete a user account in phpMyAdmin

LogintophpMyAdminwithadministrativeprivilegesandnavigatetothe"Useraccounts"tab.2.Selecttheusertodelete,choose"Revokeallprivilegesanddropuser"fromthedropdown,andclick"Go"topermanentlyremovetheaccount.3.Alternatively,useth

Sep 12, 2025 am 02:35 AM

How to import an SQL file into a MySQL database?

ToimportanSQLfileintoaMySQLdatabase,usethecommandlinewithmysql-uusername-pdatabase_name

Sep 12, 2025 am 02:31 AM

How to create a database link in Oracle

AdatabaselinkinOracleiscreatedtoaccessremotedatabaseobjectsbydefiningaconnectionpathusingnetworkdetailsandcredentials.2.Ensurenetworkconnectivity,properOracleNetconfiguration,aTNSorEasyConnectstring,andtheCREATEDATABASELINKprivilegebeforeproceeding.3

Sep 12, 2025 am 02:17 AM

How to handle JSON data in MySQL?

MySQL supports native JSON data types, which can directly store, query and modify JSON documents. 1. Automatic verification syntax using JSON type: CREATETABLEusers(profileJSON); 2. Insert data: INSERTINTOusers(name,profile)VALUES('Alice','{"age":30}'); 3. Query -> and ->>Extract values: SELECTprofile->'$.age'FROMusers; 4. Update JSON_SET(), JSON_REMOVE(): UPD

Sep 12, 2025 am 01:45 AM

mysql json

Navicat: What are the minimum requirements for a server connection?

The minimum requirements for connecting to a Navicat server include: 1) the server's IP address or host name, 2) the port number, 3) the user name, 4) the password. Make sure these parameters are set correctly and consider using strong passwords and SSH tunnels to enhance security.

Sep 12, 2025 am 01:21 AM

How to convert a table's character set in MySQL

Check the current character set: Use SHOWCREATETABLE, SHOWTABLESTATUS and SHOWFULLCOLUMNS to confirm the character set and proofreading rules of tables and columns; 2. Convert the table and column character sets: execute ALTERTABLEyour_table_nameCONVERTTOCHARACTERSETutf8mb4COLLATEutf8mb4_unicode_ci to simultaneously change the table default character set and convert the data of all character columns; 3. Change the table default character set only: If you do not modify the existing columns, use ALTERTABLEyour_table_nameDEFAULTCHARACTER

Sep 12, 2025 am 01:13 AM

How to limit the number of rows in a MySQL query?

Use the LIMIT clause to limit the number of rows returned by MySQL query, and orderly paging can be achieved in combination with ORDERBY and OFFSET. For example, SELECTFROMusersLIMIT5 returns the first 5 lines; SELECTFROMusersLIMIT10OFFSET10 skips the first 10 lines and takes the subsequent 10 lines; SELECT*FROMemployeesORDERBYsalaryDESCLIMIT3 obtains the top 3 employees with the highest salary.

Sep 12, 2025 am 12:39 AM

mysql Inquire

How to Model Data for a Social Network in MongoDB

ModelsocialnetworkdatainMongoDBbyprioritizingquerypatternsovernormalization.2.Embedfrequentlyaccessed,boundeddatalikecommentsinpostsforperformance.3.Referencelargeorhigh-volumerelationshipslikelikesandfollowerstopreventdocumentbloat.4.Storeuserfollow

Sep 12, 2025 am 12:31 AM

How to Use MongoDB for Real-Time Analytics

MongoDBsupportsreal-timeanalyticsthroughchangestreamsforimmediatedataingestion,enablingreactiveupdatestodashboardsoralerts.Itsaggregationpipelineallowson-the-flyanalysiswithoperatorslike$match,$group,and$dateTruncfortime-basedinsights.Properschemades

Sep 12, 2025 am 12:15 AM

mongodb

How to get the row count for all tables in a MySQL database?

Use INFORMATION_SCHEMA to quickly obtain the estimated row count of each table in the MySQL database, which is suitable for MyISAM and InnoDB; and the exact row count can be obtained through COUNT(*) query, but the speed is slow, which is suitable for scenarios with high accuracy requirements.

Sep 12, 2025 am 12:10 AM

How to get the last record in each group in SQL?

To get the last record of each group, you should use the window function ROW_NUMBER(), 1. Use PARTITIONBY to define the grouping field; 2. Specify the sorting field in ORDERBY and arrange it in descending order in DESC to ensure that the last record ranks first; 3. Number each group of rows through ROW_NUMBER(); 4. Filter rows with rn=1, that is, the last record in each group. This method is common in various mainstream databases and can accurately control the results.

Sep 11, 2025 pm 03:31 PM

How to handle optimistic and pessimistic locking in SQL?

Pessimisticlockingpreventsconflictsbyacquiringlocksbeforedatamodification,usingSQLcommandslikeSELECT...FORUPDATE,ensuringexclusiveaccessuntilthetransactionends,makingitidealforhigh-contentionscenariossuchasfinancialsystems.2.Optimisticlockingallowsco

Sep 11, 2025 pm 03:24 PM