When ALTER TABLE ... IMPORT TABLESPACE is run on the destination instance, the import algorithm performs the following operations for the tablespace being imported:
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Each tablespace page is checked for corruption.
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The space ID and log sequence numbers (LSNs) on each page are updated. 更新每個block: file head space id，更新fsp head space id
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Flags are validated and LSN updated for the header page.
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Btree pages are updated.
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The page state is set to dirty so that it is written to disk.
Expected error log messages for this operation:
[Note] InnoDB: Importing tablespace for table 'test/t1' that was exported
from host 'host_name'
[Note] InnoDB: Phase I - Update all pages
[Note] InnoDB: Sync to disk
[Note] InnoDB: Sync to disk - done!
[Note] InnoDB: Phase III - Flush changes to disk
[Note] InnoDB: Phase IV - Flush complete
Note
You may also receive a warning that a tablespace is discarded (if you discarded the tablespace for the destination table) and a message stating that statistics could not be calculated due to a missing .ibd file:
[Warning] InnoDB: Table "test"."t1" tablespace is set as discarded. 7f34d9a37700 InnoDB: cannot calculate statistics for table "test"."t1" because the .ibd file is missing. For help, please refer to http://dev.mysql.com/doc/refman/5.6/en/innodb-troubleshooting.html