# Quiz

+ What are the following characteristics of the Percolator transaction model? (Select 2)
  + `A` . Has a global timestamp
  + `B` . Solved the problem of globalized distributed transaction
  + `C` . Implemented the use of a single line to guarantee the atomicity of the transaction
  + `D` . Currently only physical clock timing is supported

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A, C
 What are the following characteristics of the Percolator transaction model? (Select 2)
 Has a global timestamp
 Solved the problem of global distributed transaction
 Implemented using a single line to guarantee the atomicity of transaction
 Currently only supports physical always-on timing