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| 缩写 | 全称 | 中文 | 操作对象 | 常见命令 |
|---|---|---|---|---|
| DDL | Data Definition Language | 数据定义语言 | 结构（表、索引等） | CREATE, ALTER, DROP, TRUNCATE |
| DML | Data Manipulation Language | 数据操作语言 | 数据（行记录） | INSERT, UPDATE, DELETE |
| DQL | Data Query Language | 数据查询语言 | 数据（查询） | SELECT |
| DCL | Data Control Language | 数据控制语言 | 权限 | GRANT, REVOKE |
| TCL | Transaction Control Language | 事务控制语言 | 事务 | COMMIT, ROLLBACK, SAVEPOINT |
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Kafka: distributed streaming platform RabbitMQ: message broker Different Architecture Model: push & pull Storage: rabbitmq delete after ack, kafka stored on disk, and durable ordering: rabbitmq harder
Transmission control protocol vs User datagram protocol TCP: use three handshake to establish connection between sender and receiver, more reliable, has flow control, has ordering, and guarantee data
-w: match whole word -i: ignore case -v: match doesn't contain -n: show line number -o: only show part that exactly matches -A n: n lines after the occurrence -B n: n lines before the occurrence -C n:
cat loads the whole file, fit well with reading small config file less is suggested for reading log, large file, less is more g - go to top G - go to bottom /keyword - search for keyword b - go backwa