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Database training
4.1.22. Lost update
T
1
read_item(X);
X=X-N;
write_item(X);
read_item(Y);
Y=Y+N;
write_item(Y);
T
2
read_item(X);
X=X+M;
write_item(X);
T
1
X update overwritten
‹ 4.1.21. Concurrency issues
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4.1.23. Dirty read (or Temporary update) ›
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