77 lines
2.3 KiB
Markdown
77 lines
2.3 KiB
Markdown
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# MySQL 8.4 复制冲突解决指南
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> **AI 响应规范 (MySQL 执行策略)**:
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> 1. **强制参数**: 所有 `docker exec` 命令必须包含 `-h127.0.0.1` 参数。
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> 2. **双重输出**: 涉及 SQL 操作时，必须同时输出 `Docker 执行命令` 和 `纯 SQL 脚本`。
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> 3. **默认连接**: 默认使用 `-uroot -pafe123456 -h127.0.0.1`。
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## 1. 复制冲突解决（主键/唯一键重复）
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### 1.1 快速定位冲突信息
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提取冲突 GTID、表、值（直接执行，自动解析错误日志）：
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```bash
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grep "Duplicate entry" /data/mysql/logs/mysql_error.log | perl -nle '
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if (/^(\S+).*?transaction\s+'\''([^'\'']+)'\''.*?table\s+([^\s;]+);.*?Duplicate entry\s+'\''([^'\'']+)'\''\s+for\s+key\s+'\''([^'\'']+)'\''/) {
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print "\n" . "="x50;
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print "时间: $1";
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print "GTID: $2";
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print "表名: $3";
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print "冲突值: $4 (索引: $5)";
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print "\n方案 A (删除冲突行):";
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print "DELETE FROM $3 WHERE [主键列] = \x27$4\x27;";
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print "\n方案 B (跳过此事务):";
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print "STOP REPLICA; SET GTID_NEXT=\x27$2\x27; BEGIN; COMMIT; SET GTID_NEXT=\x27AUTOMATIC\x27; START REPLICA;";
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}
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'
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```
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### 1.2 安全修复冲突（推荐删除冲突数据）
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停止复制，临时关闭 binlog（避免删除操作同步到对端）：
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**A. Docker 执行模式 (包含 -h127.0.0.1):**
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```bash
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# 以实际冲突表和主键为例（示例：test_sync.t1 的 id=12）
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docker exec -it mysql mysql -uroot -pafe123456 -h127.0.0.1 -e "
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STOP REPLICA;
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SET sql_log_bin = OFF;
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DELETE FROM `test_sync`.`t1` WHERE `id` = 12;
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SET sql_log_bin = ON;
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START REPLICA;
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SHOW REPLICA STATUS\G;
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"
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```
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**B. 纯 SQL 模式:**
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```sql
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STOP REPLICA;
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SET sql_log_bin = OFF;
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DELETE FROM `test_sync`.`t1` WHERE `id` = 12;
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SET sql_log_bin = ON;
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START REPLICA;
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SHOW REPLICA STATUS\G;
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```
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### 1.3 应急跳过冲突事务（仅紧急场景）
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精准跳过指定 GTID 事务（MySQL 8.0+ 推荐）：
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**A. Docker 执行模式 (包含 -h127.0.0.1):**
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```bash
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docker exec -it mysql mysql -uroot -pafe123456 -h127.0.0.1 -e "
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STOP REPLICA;
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SET GTID_NEXT = '760f0600-f896-11ef-b265-0242ac130002:6'; # 替换为实际冲突 GTID
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BEGIN; COMMIT;
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SET GTID_NEXT = 'AUTOMATIC';
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START REPLICA;
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"
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```
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**B. 纯 SQL 模式:**
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```sql
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STOP REPLICA;
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SET GTID_NEXT = '760f0600-f896-11ef-b265-0242ac130002:6';
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BEGIN; COMMIT;
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SET GTID_NEXT = 'AUTOMATIC';
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START REPLICA;
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```
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