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JDBC Programming Steps 1. Register the driver (inform the Java program which brand of database is being connected to) 2. Get the connection (indicates that the process of JVM and the database process have opened a channel, this is inter-process communication, remember to close the channel after use). 3. Obtain the database operation object ...

MySQL Online DDL Mechanics Table of Contents- MySQL Online DDL Mechanics - Introduction - Usage - Algorithm Options - Suitable Scenarios (from 8.0) - Unsupported DDLs - Execution Flow - Summary Introduction Data Definition Language (DDL) operations in MySQL, such as adding or removing columns and indexes, traditionally required a full table rec ...

In Java’s multi‑threaded ecosystem, locks govern access to shared resources and ensure consistency. They can be classified along several dimensions, each addressing distinct design concerns: optimistic versus pessimistic concurrency control, blocking versus non‑blocking semantics, fairness policy, reentrance capability, and the ability to share ...

Lock Types in Java Concurrency Fair vs Unfair Locks Fair locks ensure threads acquire locks in the order they requested them, preventing thread starvation but potentially reducing throughput. Unfair locks allow threads to acquire locks out of order, which can improve performance but may lead to some threads waiting indefinitely. // Creating a f ...