wujiangyong commented on issue #3681:  tomcat start slowly with default 
datasource setting
URL: 
https://github.com/apache/incubator-shardingsphere/issues/3681#issuecomment-605823201
 
 
   I've been using `4.0.1` and I have the same problem, it took me 5-7 minutes 
to start up the app.
   
   Then I google it, one way is to skip the method, which I haven't adopted. 
Copy the class `TableMetaDataInitializer` into your project, and remove 
`loadDefaultTables` method.
   
   Then I looked into the code, I found when `findActualDefaultDataSourceName` 
returns `Optional.absent()`, it will not run into the actual loading. So I 
assume in some cases, `loadDefaultTables()` is not required, and I'v only used 
table sharding with sharding-jdbc, so there comes the second solution,  I 
configured two `<sharding:master-slave-rule>` in 
`<sharding:master-slave-rules>`, and actually the second one is a placeholder 
which I never used, and everything works fine for me, so far so good.

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