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session 14
session 14

...  The desired Oracle software is installed. This includes setting up various environment variables unique to your operating system and establishing the directory structure for software and database files.  You have the operating system privileges associated with a fully operational database adminis ...
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... ODBC (Cont.)  Each database system supporting ODBC provides a "driver" library that must be linked with the client program.  When client program makes an ODBC API call, the code in the library communicates with the server to carry out the requested action, and fetch results.  ODBC program first ...
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Serializability

In concurrency control of databases, transaction processing (transaction management), and various transactional applications (e.g., transactional memory and software transactional memory), both centralized and distributed, a transaction schedule is serializable if its outcome (e.g., the resulting database state) is equal to the outcome of its transactions executed serially, i.e., sequentially without overlapping in time. Transactions are normally executed concurrently (they overlap), since this is the most efficient way. Serializability is the major correctness criterion for concurrent transactions' executions. It is considered the highest level of isolation between transactions, and plays an essential role in concurrency control. As such it is supported in all general purpose database systems. Strong strict two-phase locking (SS2PL) is a popular serializability mechanism utilized in most of the database systems (in various variants) since their early days in the 1970s.Serializability theory provides the formal framework to reason about and analyze serializability and its techniques. Though it is mathematical in nature, its fundamentals are informally (without mathematics notation) introduced below.
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