在初始化阶段,InnoDB会根据存储引擎的能力,DDL中操作语句和ALGORITHM/LOCK语句,确定在DDL执行时候允许的并发数。在这个阶段,会占用“共享升级元数据锁”(Shared Upgradeable Metadata Lock),以保护当前表定义不受到其他session的修改。 2)执行 在该阶段,DDL语句会被预处理和真正执行。这个阶段
Knowledge Base»Training & Tutorials»Advanced MariaDB Articles»Development Articles»MariaDB Internals Documentation»Using MariaDB with Your Programs (API)»Error Codes»MariaDB Error Codes 1800 to 1899»Error 1847: COPY algorithm requires a lock ...
Proof of Stake (PoS) is considered an alternative to PoW. Unlike PoW, PoS requires little specialized hardware or software resources to mine cryptocurrencies since it doesn't involve solvingcomplex computational problems. Rather, crypto validators lock up or stake some of their coins in a wallet. ...
LOCK=NONE:无锁:允许Online DDL期间进行并发读写操作。如果Online DDL操 作不支持对表的继续写入,则DDL操作失败,对表修改无效 LOCK=SHARED:共享锁:Online DDL操作期间堵塞写入,不影响读取 LOCK=EXCLUSIVE:排它锁:Online DDL操作期间不允许对锁表进行任何操作...
AlgorithmParameterSpec public interface AlgorithmParameterSpec A (transparent) specification of……欲了解更多信息欢迎访问华为HarmonyOS开发者官网
Description: Creating a functional index using the syntax: ALTER TABLE mytable ADD INDEX n12((concat(`n1`, `n2`)), ALGORITHM=INPLACE, LOCK=SHARED; generates the following error: 1846 - ALGORITHM=INPLACE is not supported. Reason: INPLACE ADD or DROP of virtual columns cannot be combined wi...
c# Copy Folder With Progress Bar ? C# Create a txt file into a ftp server C# create dynamic List<string> C# Creating an interface and implementation in shared project c# creating reference between 2 forms c# cryptographicException Specified key is not a valid size for this algorithm. C# DataGr...
In general case, it is twice as slow as any other of my implementations, probably due to locking mechanism required to access the shared stack of filtered candidate. Although I used a "SpinLock" instead of a standard "Lock", which should be faster, I feel that there were too much blockin...
In order to achieve deadlock freedom, the network is divided into a set of virtual layers, which are created by dedicating the virtual channels from each switch port into these layers. The shortest physical path between each source–destination pair is then assigned to a layer such that the ...
C# Copy Step 5. Avoiding Deadlock In the above implementation, deadlock is a potential issue because each philosopher locks the left fork first and then the right fork. To prevent deadlock, we can introduce an additional condition where the last philosopher picks up the right fork first and...