When transaction Ti requests a data item currently held by Tj, Ti is allowed to wait only if it has a timestamp larger than that of Tj (that is, Ti is younger than Tj ). Otherwise, Tj is rolled back (Tj is wounded by Ti). This is

Related MCQs

• When transaction Ti requests a data item currently held by Tj, Ti is allowed to wait only if it has a timestamp smaller than that of Tj (that is, Ti is older than Tj). Otherwise, Ti is rolled back (dies). This is
• Assume transaction A holds a shared lock R. If transaction B also requests for a shared lock on R.
•                          denotes the largest timestamp of any transaction that executed write(Q) successfully.
• Transaction timestamp is:
• In a                            operations do not wait for requests to produce tuples, but instead generate the tuples eagerly.
• If only the primary is active, the transaction is allowed to commit as soon as its commit log record is written to stable storage at the primary site. This is
• The command                                  such tables are available only within the transaction executing the query and are dropped when the transaction finishes.
• The                      requires that each transaction Ti executes in two or three different phases in its lifetime, depending on whether it is a read-only or an update transaction.
• A                      is a program running on the server machine, which accepts requests from a Web browser and sends back results in the form of HTML documents.
•                      is increasingly being used in server systems to improve performance by caching frequently used data, since it provides faster access than disk, with larger storage capacity than main memory.