2. The synchronization method according to claim 1 , further comprising: setting up the query mechanism as a blocking dump mode, wherein the transforming stage is formed of a dumping stage and a transforming stage; in the dumping stage, the query table is separated into a plurality of partitioned files to dump the plurality of partitioned files to a distributed file system; in the transforming stage, the plurality of partitioned files are combined to a combined file to transform the combined file into the target database.
3. The synchronization method according to claim 2 , further comprising: setting up the query mechanism as the blocking dump mode, performing the database query statement in the source database if the transformation status is the blocking stage; using the storage unit to temporarily store the database query statement and then forming a to-be-synchronized database query statement until the dumping stage ends if the transformation status is the dumping stage, and then performing the to-be-synchronized database query statement in the source database; using the storage unit to temporarily store the database query statement, to form the to-be-synchronized database query statement and to perform the to-be-synchronized database query statement in the source database if the transformation status is the transforming stage; performing the to-be-synchronized database query statement in the target database if the transformation status is the completing stage and the to-be-synchronized database query statement exists in the storage unit; performing the database query statement in the source database and the target database if the transformation status is the completing stage and the to-be-synchronized database query statement does not exist in the storage unit.