How to use mysql global lock

1. Global lock locks the entire database. After locking, the entire instance will be in a read-only state.

2. Subsequent MDL writing sentences, DDL sentences, and updated transaction commit sentences will be blocked. Its typical usage scenario is to make a logical backup of the entire database.

Lock all tables to obtain a consistent view and ensure data integrity.

Example

# 全局锁，简称FTWRL
FLUSH TABLES WITH READ LOCK;
 
# 解锁命令
UNLOCK TABLES;

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