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In order to better optimize MySQL in high concurrency, it is necessary to understand the locking table mechanism when MySQL query is updated.I. OverviewMySQL has three levels of Lock: page level, table level, row level.MyISAM and MemoryStorageThe
MySQL table sharding Methods: MySQL
I. Let me explain why Table sharding is required.
When a piece of data reaches several millions, it takes more time for you to query the data at a time. If there is a joint query, I think it may die there. The
String function string comparison function if the result length is greater than the maximum value of the max_allowed_packet system variable, the return value of the string value function is NULL. See section 7.5.2 "Adjust server Parameters ".
String
String functionsstring comparison functionsIf the length of the result is greater than the maximum value of the Max_allowed_packet system variable, the return value of the string value function is null. See section 7.5.2, "Tuning server parameters."
MySQL database functions are frequently used in actual operations. Therefore, it is best to have a certain understanding of MySQL database functions. I found this article very well on a website, I have made a special offer for you to share with you
For operations on string positions, the first position is marked as 1.
ASCII (str)
Returns the ASCII code value of the leftmost character of the string str. If Str is an empty string, returns 0. If STR is NULL, returns NULL.
Mysql> Select ASCII (' 2
MySQL performance tuning and Architecture Design-Chapter 1 Performance Design-MySQL Replication and replication Optimization
Chapter 1 scalability design-MySQL Replication
Preface:
MySQL Replication is a unique feature of MySQL. It can completely
Concrete Example 1. PHP Server ComponentsFor beginners, it is recommended to use the integrated server component, which already includes PHP, Apache, Mysql and other services, eliminating the time spent by developers in the tedious configuration
MySQL partition table technology analysis bitsCN.com
MySQL partition overview:Allows you to allocate multiple parts of a single table across file systems based on rules that can be set to any size. In fact, different parts of a table are stored as
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