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Technical Articles

Database

phpMyAdmin execute bulk queries

Yes, phpMyAdmin supports batch execution of SQL queries. You only need to enter multiple semicolon-separated statements in the SQL tab and click "Go" to execute; 1. After entering the target database or table, click the "SQL" tab; 2. Enter multiple SQL statements, each ending in a semicolon; 3. Click "Go" to execute in order; but note that there may be max_allowed_packet and execution time limits. It is recommended to use the "Import" tab to upload .sql files for large files; ensure the syntax is correct and avoid partial execution due to single errors; it is recommended to wrap related operations with STARTTRANSACTION and COMMIT to ensure data consistency; use multi-line INS

Aug 08, 2025 am 05:02 AM

How to use GROUP_CONCAT in MySQL

GROUP_CONCAT is a function in MySQL that group multiple rows of data into strings by specified columns. 1. Basic splicing can be achieved through SELECTGROUP_CONCAT (column_name)FROMtable_nameGROUPBYgrouping_column; 2. Use SEPARATOR custom separators such as '|' or null values; 3. Use ORDERBYproductASC to sort the splicing contents within the function; 4. Use IFNULL or COALESCE to process NULL values; 5. Use SETSESSION or GLOBALgroup_concat_max_len

Aug 08, 2025 am 04:44 AM

mysql

How to benchmark Redis performance using redis-benchmark?

Redis's performance benchmark can be implemented through the official tool redis-benchmark. 1. Basic use: Run redis-benchmark-h127.0.0.1-p6379 to quickly test the default scenario; 2. Custom testing: Use -t to specify the command, -n to set the number of requests, and -c to set the concurrent number to simulate real load; 3. Fine control: Use -d to adjust the data size, and -P to enable pipeline batch sending commands to improve throughput; 4. Remote testing and analysis: Specify the remote IP and port, pay attention to the number of requests per second and delay distribution to evaluate performance.

Aug 08, 2025 am 04:29 AM

redis Performance Testing

How to save table filters and sort order?

In Excel and GoogleSheets, filters are not saved by default, but sorting is done. The filter status is not retained after closing the file in Excel, but the color change of the table head arrow indicates that the filter has been set and can be saved through VBA macros; the filter of GoogleSheets will be retained, but the filter status will still not be saved. Exporting filter results can be used as an alternative. Sort directly changes the data order and keep it permanently. Save it and take effect. However, it is necessary to note that merging cells and blank rows affect the accuracy of sorting, and avoid confusion caused by only sorting visible areas in the filter state.

Aug 08, 2025 am 04:15 AM

Implementing MySQL Database Patch Management

There are three reasons why patch management cannot be ignored: First, MySQL version is updated frequently, and patches are mostly used to repair security vulnerabilities or known problems; second, failure to upgrade in time may cause the database to face the risk of attack or run abnormalities, such as master-slave replication failure; third, even if you use MySQL instances on the cloud, you still need to grasp the upgrade timing and scope of impact. Three key points should be considered when judging whether to patch: whether security vulnerabilities are involved need to be handled first; whether they affect current business functions; and whether they are major changes need to be carefully evaluated. Patch testing needs to be carried out in steps: build a test environment that is consistent with the production environment, back up data in advance, perform core SQL and stress tests, check logs and application layer compatibility. Suggestions for patch release: Choose business launch during the peak period and upgrade the slave first under the master-slave architecture

Aug 08, 2025 am 04:03 AM

mysql database

How to find the DDL of a table in Oracle

To obtain the DDL of Oracle table, you should use the DBMS_METADATA.GET_DDL function, 1. Use SELECTDBMS_METADATA.GET_DDL('TABLE','Table name','Schema name')FROMDUAL; query the complete creation statement, 2. Make sure the table name and schema name are uppercase unless the original object uses double quotes to define the case, 3. Make sure the user has permission to access the data dictionary and execute DBMS_METADATA, 4. Set SETLONG20000; SETPAGESIZE0; in tools such as SQL*Plus to avoid output truncation, 5. If you only need column information, you can query USER

Aug 08, 2025 am 03:47 AM

How to tune a SQL query in Oracle

IdentifytheproblematicqueryusingAWR,ASH,SQLTrace,orV$SQLtofindhigh-loadqueries;2.AnalyzetheexecutionplanviaEXPLAINPLANorDBMS_XPLANtodetectinefficiencieslikefulltablescansorjoinissues;3.Optimizequerystructurebyselectingonlyneededcolumns,usingEXISTSove

Aug 08, 2025 am 03:12 AM

How to Deal with Deadlocks in MySQL?

Deadlock cannot be completely avoided, but can be effectively managed through the following measures: 1. Catch deadlock errors in application code (such as MySQL's 1213 error) and retry the transaction. It is recommended to use exponential backoff delay; 2. Shorten the time when the transaction holds locks, move non-database operations out of the transaction and commit as soon as possible; 3. Access tables and rows in a consistent order in all transactions to prevent loop waiting; 4. Use a lower isolation level (such as READCOMMITTED) when allowed to reduce the use of gap locks; 5. Optimize indexes to reduce lock contention, ensure that query conditions, connections and sort fields use appropriate indexes; 6. Use SELECT...FORUPDATE and LOCKINSHAREMODE with caution, lock only necessary rows

Aug 08, 2025 am 03:07 AM

How does Oracle manage chained and migrated rows, and what is their performance impact?

Chained and migratedrows will affect Oracle performance due to additional I/O. Solutions include table restructuring, PCTFREE adjustment, etc. When the Chainedrows is inserted, the migratedrows is moved and the pointer is left after the update due to insufficient space. Both of them cause the query to be read multiple times; it can be detected through the ANALYZETABLE or CHAINED_ROWS view, and eliminated with ALTERTABLEMOVE or export import. At the same time, setting a higher PCTFREE, selecting the appropriate block size and partition can prevent problems; monitoring the "tablefetchcontinuedrow" statistical information can determine its impact, although there are few

Aug 08, 2025 am 02:47 AM

oracle performance

What Data Structures Does Redis Offer That Traditional Databases Lack?

Redisoffersuniquedatastructureslikestrings,lists,sets,sortedsets,hashes,HyperLogLogs,bitmaps,andgeospatialindexes,whichtraditionaldatabasestypicallydon'thave.1)Stringssupportatomicoperationsforcounters.2)Listsfunctionasefficientqueuesorstacks.3)Setsm

Aug 08, 2025 am 02:44 AM

傳統(tǒng)數(shù)據(jù)庫(kù)

How to create a foreign key relationship in Navicat?

The key steps to creating foreign keys in Navicat include: 1. Ensure that the two tables use the InnoDB engine; 2. Open the subtable design interface, switch to the "Foreign Keys" tab and add new records; 3. Select the foreign key field and the corresponding main table and primary key field; 4. Set the behavior during update and deletion (such as RESTRICT, CASCADE, SETNULL); 5. Ensure that the field types are consistent and the foreign key fields have indexes. If the field definition conflicts, you need to adjust first. The entire process is done through a graphical interface without writing SQL.

Aug 08, 2025 am 02:39 AM

Mastering CRUD Operations in MongoDB for Modern Applications

MasteringCrudinMongodbrequiresDelingitsdocument Basedbson Modelforflexibledatamement.2.Ussertone () BervesinsertsandinsertMine () ForeffiTrientBulk operations, Whilevalidating data dandindexingfieldshandshandshand.

Aug 08, 2025 am 02:22 AM

mongodb crud

How to perform a failover in Oracle Data Guard

Confirmtheprimaryisdownandswitchoverisnotpossiblebeforeinitiatingfailover.2.EnsureallredologsareappliedonthestandbybycheckingV$ARCHIVED_LOGandregisteringanymissinglogsifnecessary.3.CancelmanagedrecoverywithALTERDATABASERECOVERMANAGEDSTANDBYDATABASEFI

Aug 08, 2025 am 01:21 AM

How to find orphaned records in a database in SQL?

Orphanedrecordsoccurwhenachildrecordreferencesanon-existentparentrecord,typicallyduetomissingreferentialintegrity.2.Tofindthem,useaLEFTJOINbetweenthechildandparenttablesandfilterwheretheparentkeyisNULL,suchas:SELECTo.FROMordersoLEFTJOINusersuONo.user

Aug 08, 2025 am 12:51 AM