Course10647

Course Introduction：Shell scripting skills will never go out of style: "Shangguan Shell Video Tutorial" lets you know that they can allow UNIX to fully realize its true potential. For uNIx users and system administrators, writing shell scripts is a must, which allows you to quickly control and customize the powerful functions of any UNIX system.

Course5953

Course Introduction：RHCE is the abbreviation of Red Hat Certified Engineer. RHCE is the first Linux-oriented certification exam on the market. It is not an ordinary certification test. Compared with other operating system certification exams, the RHCE exam takes a full day and pays more attention to the candidates' practice during the test. experience. "Shangguan Linux RHCE Video Tutorial (1)" is a video recorded by Linux for the RHCE exam. It sorts out and explains all the knowledge points of Linux in the exam, making it easier to understand the exam content and make the exam easier.

Course10845

Course Introduction：Oracle has always been a leader in the database field due to its good data security and stability. "MoLe Technology Oracle Video Tutorial" is designed for database developers and introduces Oracle from scratch. In addition to basic SQL syntax, it also brings you custom functions and stored procedures that are necessary in the database development process.

Course5540

Course Introduction：RHCE is the abbreviation of Red Hat Certified Engineer. RHCE is the first Linux-oriented certification exam on the market. It is not an ordinary certification test. Compared with other operating system certification exams, the RHCE exam takes a full day and pays more attention to the candidates' practice during the test. experience. "Shangguan Linux RHCE Video Tutorial (2)" is a video recorded by Linux for the RHCE exam. It sorts out and explains all the knowledge points of Linux in the exam, making it easier to understand the exam content and make the exam easier.

Course6398

Course Introduction：The advanced chapter of "Shangguan Linux Video Tutorial" explains to everyone the knowledge about security. This is the last stage of Linux learning, and many people stop here because it is more difficult than before. But after completing the corresponding study, it will be very helpful to the learners. I hope everyone will stick to it.

Course Introduction：Pessimistic lock, as its name suggests, has strong exclusive and exclusive characteristics. It refers to a conservative attitude towards data being modified by the outside world. The optimistic locking mechanism adopts a more relaxed locking mechanism. Compared with pessimistic locking, optimistic locking is also a mechanism to avoid data processing errors caused by database phantom reading, long business processing time and other reasons.

2020-07-02 comment 04377

Course Introduction：Concept Redis is an in-memory key-value storage system that supports a variety of data structures, such as strings, hashes, lists, etc. Redis provides two locking mechanisms, namely optimistic locking and pessimistic locking. Optimistic lock Optimistic lock is an optimistic concurrency control strategy. It believes that data will not be occupied by other threads in most cases. Therefore, every time the data needs to be modified, the lock will not be acquired, but modified directly. In Redis, optimistic locking can be implemented through the WATCH and CAS commands. The WATCH command is used to monitor one or more keys, and the CAS command is used to check and update the value of the key. For example, suppose you have a counter key that multiple clients need to operate on. Using optimistic locking, each client can

2023-05-28 comment 01445

Course Introduction：This article introduces the relevant knowledge of pessimistic locking and optimistic locking to everyone. It has certain reference value and I hope it can help everyone.

2020-11-27 comment 09550

Course Introduction：MySQL 乐观锁通过检查数据自上次读取以来的版本是否已更改来实现并发控制。要启用乐观锁，可以使用 READ_COMMITTED 或 REPEATABLE_READ 事务隔离级别，或在 WHERE 子句中使用版本列。

2024-05-29 comment 0935

Course Introduction：酷狗音乐mv要如何观看？现在很多音乐软件都是可以观看mv的，那么酷狗里面要怎么看呢？想知道的小伙伴不妨来看看下面的酷狗音乐mv观看方法介绍吧！希望会有帮助。酷狗音乐mv观看方法一览【酷狗音乐】-【歌曲】-【三点图标】-【MV】。具体步骤：1、首先打开酷狗音乐软件，进入到首页中后我们可以看到很多的歌曲，在这里随机点击一个【歌曲】;2、然后来到歌曲播放的页面中我们可以使用一些功能，我们点击右侧下方的【三点图标】;3、接着在弹出的对话框中我们可以看到有很多的工具，在这里点击【MV】就可以查看到了;

2024-05-13 comment 0884