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After the transaction that contains the delState("A") function is committed, what happens to the ledger and state database?
Suggested Answer: C
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In Hyperledger Fabric, when a transaction that includes the delState('A') function is committed, it results in the removal of the state of the key 'A' from the current state database. However, the history of all transactions that have affected the key 'A' remains intact in the ledger. This operation ensures that while the current state reflects the deletion, the immutability and traceability of the ledger are preserved, allowing for auditability and verification of past states. Options such as setting an empty value to the key or altering the transaction history are not supported, as they would violate the principles of immutability and transparency central to blockchain technology. Therefore, the correct outcome of a delState('A') operation is that the current state of 'A' is deleted, but its transaction history remains accessible in the ledger.
36 comments · newest first
TE
Terrilyn
10 months ago
A is definitely not right, getstate won't show deleted keys.
LI
Lindsey
11 months ago
I think B makes sense too, but not as complete.
SI
Silva
11 months ago
No way, D is totally wrong! History doesn’t just vanish.
CR
Craig
11 months ago
Surprised to see people doubting C, it’s pretty standard!
RO
Ronnie
11 months ago
C is correct! The history stays in the ledger.
LA
Lakeesha
12 months ago
I definitely recall that the ledger keeps a history of transactions, so I think option C is the best choice here.
HE
Helene
12 months ago
I’m a bit confused about whether the write set gets an empty value or if it just removes the key entirely. I might lean towards option B, but I’m not certain.
LA
Laurel
1 year ago
I remember practicing a question like this, and I think option C sounds right because the history should remain even if the state is deleted.
MI
Michal
1 year ago
I think when delState("A") is called, it removes the state from the database, but I’m not sure if the history is kept in the ledger.
NA
Nakisha
1 year ago
I'm pretty sure the answer is C. The state of 'A' is deleted from the state database, but the transaction history is still preserved in the ledger.
AI
Aide
1 year ago
Okay, I've got this. The state of 'A' is removed from the state database, but the history of updates to 'A' remains in the ledger. That's the key distinction here.
GE
Gertude
1 year ago
Hmm, I'm a bit confused on the difference between the ledger and the state database. I'll need to review those concepts before I can confidently answer this.
JA
Janessa
1 year ago
This is a tricky one, but I think the key is understanding how the state database and ledger work together. I'll need to carefully consider the implications of deleting a state.
HO
Honey
2 years ago
Hmm, this question is a real head-scratcher. I'm going to go with option A and hope the grader has a sense of humor.
SU
Susy
1 year ago
User 3: I agree with Curt, option A seems like the right choice.
CU
Curt
1 year ago
User 2: I'm not so sure, I think it might be option C.
CL
Cletus
1 year ago
User 1: I think option A is correct.
BU
Buddy
2 years ago
Hold on, are we sure the ledger is not just a fancy name for the state database? I'm going with option D just to be safe.
KE
Keith
1 year ago
Tasia: Oh, I see. Thanks for clarifying!
TA
Tasia
1 year ago
User 2: The state of the key 'A' is removed from the state database, but its history remains in the ledger.
DE
Dell
1 year ago
User 1: The ledger and state database are different. Option D is incorrect.
TO
Tomoko
2 years ago
I believe option C is correct because the delState function deletes the current state but keeps the history for auditing purposes.
ST
Stefanie
2 years ago
I think the state of the key 'A' is removed from the state database, but its history remains in the ledger.
WE
Weldon
2 years ago
What happens to the ledger and state database after the delState('A') function is committed?
IS
Isabella
2 years ago
Option B seems more logical to me. The deleting transaction sets an empty value to the key 'A' in the write set.
AB
Abel
2 years ago
User 2: Yes, that makes sense. It would keep track of the history in the ledger while removing the state from the database.
LE
Leonor
2 years ago
User 1: I think option B is correct. The deleting transaction sets an empty value to the key 'A' in the write set.
MA
Matthew
2 years ago
I think option C is the correct answer. The state of the key 'A' is removed from the state database, but its history remains in the ledger.
AV
Avery
1 year ago
B) The deleting transaction sets an empty value to the key \'A\' in the write set.
KA
Katheryn
1 year ago
I agree, option C seems to be the most accurate.
NA
Nakisha
1 year ago
C) The state of the key \'A\' is removed from the state database, but its history remains in the ledger.
LA
Lashaunda
1 year ago
A) getstate(\'A\') function returns the current state of the key \'A\'.
KI
Kip
1 year ago
B) The deleting transaction sets an empty value to the key \'A\' in the write set.
FE
Felton
1 year ago
I agree, option C seems to be the most accurate.
EM
Emiko
2 years ago
C) The state of the key \'A\' is removed from the state database, but its history remains in the ledger.
TE
Tegan
2 years ago
A) getstate(\'A\') function returns the current state of the key \'A\'.