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With the linear commit protocol, sites are connected in a chain, and the subtransaction at the left-hand end of the chain initiates the protocol. Propose a crash recovery protocol for a site in the chain. Consider the following three points at which the crash might occur and state in each case (1) how the site determines from its log that it is at that point and (2) what action it takes (beyond standard recovery processing)
(a) The site crashes before the first message from its left-hand neighbor arrives.
(b) The site crashes after sending the first message to its neighbor on the right, but before receiving a message from its neighbor on the right.
(c) The site crashes after sending a message to its neighbor on the left but before receiving the second message from its neighbor on the left.
construct an er diagram for a hospital with a set of patients and a set of medical doctors. associate with each patient a log of various test and examination conducted.convert er d
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what is attribute is attribute inheritance in dbms?
What are the function of DBA?
What is the meaning of Data independence? Data independence means a programs that are not dependent on the physical attributes of data and a programs that are not dependent on
Ask questioYou are the database administrator in a university. You have been tasked to come up with a new database for the University. Using the stages in Database Life Cycle come
A basic model of Database Access Control Models of database access control have grown out of previous work on protection in operating systems. Let us talk about one simple mode
Database Manager It is the interface among low-level data, queries and application programs. Databases typically need a large amount of storage space. It is kept on disks, as
Primary index A primary index is a file that has a sorted series of records having two columns: a block address for that key field in the data file; and the ordering key field.
I need help with data warehousing and business intelligence course project about designing a data warehouse for a jewelry company that does not have one
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