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我即將複製生產數據庫,頻繁讀取/寫入。下面的MySQL手冊上的說明,我執行以下命令關於MySQL數據庫複製的問題 - READ LOCK之後的不同二進制日誌座標
mysql> FLUSH TABLES WITH READ LOCK;
Query OK, 0 rows affected (0.16 sec)
mysql> show master status;
+------------------+-----------+--------------+------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+-----------+--------------+------------------+
| mysql-bin.000061 | 717697391 | | |
+------------------+-----------+--------------+------------------+
1 row in set (0.00 sec)
然後我通過執行以下命令
shell> mysqldump --lock-all-table --databases first second third -u root -p > dbdump.sql
我然後運行以下命令啓動備份程序
mysql> show master status;
+------------------+-----------+--------------+------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+-----------+--------------+------------------+
| mysql-bin.000061 | 717697462 | | |
+------------------+-----------+--------------+------------------+
1 row in set (0.00 sec)
mysql> show master status;
+------------------+-----------+--------------+------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+-----------+--------------+------------------+
| mysql-bin.000061 | 717697462 | | |
+------------------+-----------+--------------+------------------+
1 row in set (0.00 sec)
如果執行「READ LOCK」語句後表格已被鎖定,爲什麼兩個連續的「show master status」命令中的座標位置不同?我應該使用哪個位置值進行復制?
順便說一句,我還需要備份過程後運行
mysql> UNLOCK TABLES;
?或者當mysqldump完成時,表格將自動解鎖。
感謝您的回答!但問題仍然存在:我應該使用哪個二進制日誌座標位置?謝謝。 – fanchyna