Data Processing Systems And Storage Video
DATA PROCESSING SYSTEMS Data Processing Systems And Storage
ACID Atomicity, Consistency, Isolation, and Durability is a set of properties that guarantee that database transactions are processed reliably.
In the context of databases, a single logical operation on the data is called a transaction. The ESE-based datastore engine provides ACID transactions that allow applications to retrieve data only from reliable data states and maintain data consistency in the event of an unexpected process termination or system shutdown. Atomic — Either all of the operations in the transaction succeed commit or none of the operations persist rollback.
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The transaction state change is all or none. If the database crashes in the middle of processing a transaction, then the transaction is rolled back. Consistent — If the data are consistent before the transaction begins, then they will be consistent after the transaction finishes. The database is transformed from one correct state to another.
Isolated — The effects of a transaction that is in progress are hidden from all other transactions. Even though transactions run at the same time, it appears to each that the other transactions occur before or after, but not both.
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Durable — When a transaction finishes, its results are persistent and will survive a system crash. A committed transaction changes its state so that it is preserved in the database even if the system crashes. A balanced tree data structure that keeps data sorted and allows searches, sequential access, insertions, and deletions in logarithmic amortized time. These allows for faster sequential seeking through the data.
A proprietary data storage technology licensed from Trio Systems that defines the physical layer of the database.
Data Storage Terminology
CAPRI is the logic level of the database, which defines the record type, record Srorage, and record level. This resides above the physical level of the database which is ESE. This is the external view of the database that a client would see. CygNet services that use the same underlying database engine DBS. The schema of each service is defined in a Data Dictionary Language. Indexes are providing for searching.
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Extensible Storage Engine. ESE is a Microsoft data storage technology that defines the physical layer of a database. A Microsoft utility used to view, modify, and repair ESE-based datastores.]
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