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更新数据库笔记。
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@Suomea
Suomea committed Nov 30, 2024
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10 changes: 7 additions & 3 deletions docs/DM/达梦 Tips.md
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mvn install:install-file -Dfile=.\DmJdbcDriver18.jar -DgroupId=com.dm -DartifactId=DmJdbcDriver18 -Dversion=18 -Dpackaging=jar
```

## 查看 License 信息
EXPIRED_DATE 为空说明永久有效。
```
## 查询信息
查看许可信息，EXPIRED_DATE 为空说明永久有效。
```sql
select * from v$license
```

查看版本信息。
```sql
select * from v$instance;
```
## 达梦默认的角色
5 changes: 4 additions & 1 deletion docs/Doris/Doris 接入 Kafka 的数据.md
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Expand Up @@ -55,4 +55,7 @@ show routine load 能够查询导入作业的状态。

如果遇到错误，比如必填字段缺少会导致任务 pause，`resume routine load for task_name;` 重启启动任务就好，会跳过错误的消息。

测试完毕之后可以通过 pause 暂停导入任务：`pause routine load for task_name;`。
测试完毕之后可以通过 pause 暂停导入任务：`pause routine load for task_name;`。

## 调优
Kafka 多
23 changes: 23 additions & 0 deletions docs/MySQL/MySQL 配置主从.md
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Expand Up @@ -63,6 +63,29 @@ character-set-server = utf8mb4
max_connections = 2000
```

使用启动选项 --binglog-ignore-db=db_name 可以配置对某个数据库不生成 binlog。该启动选项没有对应的系统变量。
```
[mysqld]
binlog-ignore-db=test_db
binlog-ignore-db=dev_db
```

查看 binlog 的文件内容：
```
mysqlbinlog --no-defaults --base64-output=decode-rows -v ./mysql_binary_log.135674 --result-file=135674.sql
```
- **`mysqlbinlog`**：这是 MySQL 提供的一个命令行工具，用于读取和显示 MySQL 二进制日志文件的内容。

- **`--no-defaults`**：这个选项告诉工具不要使用任何默认的配置文件（如 `my.cnf` 或 `my.ini`）。这样可以确保命令的执行仅依赖于命令行中提供的参数，而不受任何配置文件的影响。

- **`--base64-output=decode-rows`**：这个选项指定解码二进制日志中的基于 base64 编码的行事件。当二进制日志中的行数据被修改时，会进行 base64 编码，因此解码后可以使输出更具可读性。

- **`-v`**：这个选项是 `verbose`（详细模式）的缩写，表示输出会更加详细。它会以可读的格式展示每个事件的内容，显示实际执行的 SQL 语句，而不仅仅是事件类型。

- **`./mysql_binary_log.135674`**：这是需要处理的 MySQL 二进制日志文件的路径。在此命令中，文件名为 `mysql_binary_log.135674`，该文件包含了 MySQL 数据库的所有更改日志。

- **`--result-file=135674.sql`**：这个选项指定处理后的结果输出到一个文件中。在本例中，解码后的 SQL 语句和数据变更将保存到 `135674.sql` 文件中。

查看二进制日志文件和位置，从库配置需要使用 `File`和`Position`。
```text
mysql> show master status \G
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