Consider a database DB with relations R1 and R2. The relation R1 contains tuples

Question

Consider a database DB with relations R1 and R2. The relation R1 contains tuples t1 and t2 and the relation R2 contains tuples t3, t4, and t5. Assume that the database DB, relations, and tuples form a hierarchy of lockable database elements. Explain the sequence of lock requests and the response of the locking scheduler to the following schedule. You may assume all lock requests occur just before they are needed, and all unlocks occur at the end of the transaction, i.e., EOT. T1:R(t1), T2:W(t2), T2:R(t3), T1:W(t4)

Explanation / Answer

these will ensure that the files in a system-huge set up will not take priority over the copy of the standard library bundled together with your software. in any other case, your customers might also experience problems the usage of your utility. be aware that the first proposal is the exceptional, as the opposite may additionally nonetheless be at risk of non-popular paths inside the registry and user website-packages.

3.6. extra modules
even though Python ambitions to be transportable among all platforms, there are functions that are particular to home windows. more than one modules, each inside the popular library and external, and snippets exist to use these features.

The windows-specific fashionable modules are documented in MS windows unique services

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