Computer Science · Database Management Systems
Consider a database system using the Basic Timestamp Ordering (BTO) Protocol. The initial timestamps for data items X and Y are given as follows: R-TS(X) = 25, W-TS(X) = 30 R-TS(Y) = 15, W-TS(Y) = 20 The following sequence of read operations is requested by concurrent transactions: 1. Transaction T1 with TS(T1) = 28 requests read(X)2. Transaction T2 with TS(T2) = 35 requests read(X)3. Transaction T3 with TS(T3) = 22 requests read(Y)4. Transaction T4 with TS(T4) = 18 requests read(Y) Calculate the final values of the Read-Timestamps R-TS(X) and R-TS(Y) after all four requests are processed sequentially.
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1R-TS(X) = 25, R-TS(Y) = 18
- 2R-TS(X) = 28, R-TS(Y) = 22
- 3R-TS(X) = 30, R-TS(Y) = 20
- 4R-TS(X) = 35, R-TS(Y) = 22✓
Correct answer
R-TS(X) = 35, R-TS(Y) = 22
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