11ecbd5d_e706_7152_b4b3_33cbc0876f5d_SM8842_00 Figure 20.2 -Add the operation commit at the end of each of the transactions T 1 and T 2 from Figure 20.2; then list all possible schedules for the modified transactions. Determine which of the schedules are recoverable, which are cascadeless, and which are strict.

T 1 T 2 read_item(X); read_item(X); X := X -

Database Systems 6th Edition by Ramez Elmasri, Shamkant B. Navathe

النسخة 6الرقم المعياري الدولي: 0136086209

Database Systems 6th Edition by Ramez Elmasri, Shamkant B. Navathe

النسخة 6الرقم المعياري الدولي: 0136086209

تمرين 3

Figure 20.2 -Add the operation commit at the end of each of the transactions T<sub>1</sub> and T<sub>2</sub> from Figure 20.2; then list all possible schedules for the modified transactions. Determine which of the schedules are recoverable, which are cascadeless, and which are strict.

Figure 20.2
-Add the operation commit at the end of each of the transactions T₁ and T₂ from Figure 20.2; then list all possible schedules for the modified transactions.
Determine which of the schedules are recoverable, which are cascadeless, and which are strict.

التوضيح

موثّق

T₁ T₂
read_item(X); read_item(X);
X := X -...