mysql 锁表语句与解锁表详解
页级的典型代表引擎为BDB。 表级的典型代表引擎为MyISAM,MEMORY以及很久以前的ISAM。 行级的典型代表引擎为INNODB。
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CAMM2 for desktop PCs: MSI explains the benefits of the new RAM standard for gaming towers
Aug 17, 2024 pm 06:47 PM
The first LPCAMM2 modules for laptops are already being delivered, and desktop mainboards are also expected to be equipped with CAMM2 in future. CAMM2 and LPCAMM2 are not compatible with each other, and even on desktop PCs, customers need to be caref
what is mysql innodb
Apr 14, 2023 am 10:19 AM
InnoDB is one of the database engines of MySQL. It is now the default storage engine of MySQL and one of the standards for binary releases by MySQL AB. InnoDB adopts a dual-track authorization system, one is GPL authorization and the other is proprietary software authorization. InnoDB is the preferred engine for transactional databases and supports transaction security tables (ACID); InnoDB supports row-level locks, which can support concurrency to the greatest extent. Row-level locks are implemented by the storage engine layer.
How MySQL sees InnoDB row format from binary content
Jun 03, 2023 am 09:55 AM
InnoDB is a storage engine that stores data in tables on disk, so our data will still exist even after shutdown and restart. The actual process of processing data occurs in memory, so the data in the disk needs to be loaded into the memory. If it is processing a write or modification request, the contents in the memory also need to be refreshed to the disk. And we know that the speed of reading and writing to disk is very slow, which is several orders of magnitude different from reading and writing in memory. So when we want to get certain records from the table, does the InnoDB storage engine need to read the records from the disk one by one? The method adopted by InnoDB is to divide the data into several pages, and use pages as the basic unit of interaction between disk and memory. The size of a page in InnoDB is generally 16
How to handle mysql innodb exception
Apr 17, 2023 pm 09:01 PM
1. Roll back and reinstall mysql. In order to avoid the trouble of importing this data from other places, first make a backup of the database file of the current library (/var/lib/mysql/location). Next, I uninstalled the Perconaserver 5.7 package, reinstalled the original 5.1.71 package, started the mysql service, and it prompted Unknown/unsupportedtabletype:innodb and could not start normally. 11050912:04:27InnoDB:Initializingbufferpool,size=384.0M11050912:04:27InnoDB:Complete
Blue screen problem caused by win10 memory management
Dec 30, 2023 pm 07:11 PM
The win10 system is an excellent system that is worth using. Its strong compatibility and high intelligence can ensure that there will be basically no problems in the use of the win10 system. However, recently, many friends have reported that their computers frequently have blue disks. And it always prompts the error code memorymanagement. What's going on? Today, the editor will bring you the solution to the frequent blue screen of win10 and the memory management termination code. If you need a game, come and take a look. Solution to win10memorymanagement blue screen: Solution 1: 1. Use "Win key + R" + enter "control + enter" to enter the control surface
How to solve phantom reading in innoDB in Mysql
May 27, 2023 pm 03:34 PM
1. Mysql transaction isolation level These four isolation levels, when there are multiple transaction concurrency conflicts, some problems of dirty reading, non-repeatable reading, and phantom reading may occur, and innoDB solves them in the repeatable read isolation level mode. A problem of phantom reading, 2. What is phantom reading? Phantom reading means that in the same transaction, the results obtained when querying the same range twice before and after are inconsistent as shown in the figure. In the first transaction, we execute a range query. At this time, there is only one piece of data that meets the conditions. In the second transaction, it inserts a row of data and submits it. When the first transaction queries again, the result obtained is one more than the result of the first query. Data, note that the first and second queries of the first transaction are both in the same
MySQL storage engine selection comparison: InnoDB, MyISAM and Memory performance index evaluation
Jul 26, 2023 am 11:25 AM
MySQL storage engine selection comparison: InnoDB, MyISAM and Memory performance index evaluation Introduction: In the MySQL database, the choice of storage engine plays a vital role in system performance and data integrity. MySQL provides a variety of storage engines, the most commonly used engines include InnoDB, MyISAM and Memory. This article will evaluate the performance indicators of these three storage engines and compare them through code examples. 1. InnoDB engine InnoDB is My
Explain InnoDB Full-Text Search capabilities.
Apr 02, 2025 pm 06:09 PM
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.
