從5.7.8開始，mysql官方提供一個邏輯備份工具：mysqlpump。

和mysqldump工具類似，也是用來備份資料庫的。

功能和mysqldump也差不多，但是速度卻比mysqldump快很多。我在筆記本上測試至少快50%（但是我mysqlpump執行緒開到5時，io幾乎成為瓶頸）。

mysqldump是單執行緒工作，如果要備份庫超過百gb，那麼mysqldump幾乎不可用。

相比於mysqldump，mysqlpump是多執行緒工具，意思就是可以平行匯出，匯出速度大大加快。

並且可以通過如下的引數來控制通道數和每個通道的執行緒數。

下面是文件上的描述：

比如：

shell> mysqlpump --parallel-schemas=db1,db2 --parallel-schemas=db3
mysqlpump要為匯出db1和db2庫啟動一個佇列，並且要為匯出db3庫啟動一個佇列，餘下的其他庫還要啟動一個佇列（預設佇列）。這些佇列都是預設的兩個執行緒每佇列。

shell> mysqlpump --parallel-schemas=db1,db2 --parallel-schemas=db3 --default-parallelism=4
This is the same as the previous example except that all queues use four threads.
和上面相同，只是每個佇列啟動4個執行緒（包含預設那個佇列）。

shell> mysqlpump --parallel-schemas=5:db1,db2 --parallel-schemas=3:db3
db1和db2啟動一個佇列（5個執行緒），db3啟動一個佇列（3個執行緒），其他庫啟動一個佇列（預設佇列，預設2個執行緒）。

下面是我測試的匯出過程：

D:\>mysqlpump --default-parallelism=5 --triggers --routines --events -B cms > d:\temp\mysqlpump.cms.sql
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Dump completed in 171082 milliseconds


D:\>

Dump progress: 151/152 tables, 3106067/3023185 rows

ps，這個顯示有些誤導人。