摘要:
A system including multiple application servers for accessing shared data and a centralized control unit for centrally controlling a lock applied to the shared data by each of the application servers. Each application server includes a distributed control unit for controlling a lock applied to the shared data by the application server and a selection unit for selecting any one of distributed mode in which a lock is acquired from the distributed control unit or a centralized mode in which a lock is acquired from the centralized control unit.
摘要:
A system including multiple application servers for accessing shared data and a centralized control unit for centrally controlling a lock applied to the shared data by each of the application servers. Each application server includes a distributed control unit for controlling a lock applied to the shared data by the application server and a selection unit for selecting any one of distributed mode in which a lock is acquired from the distributed control unit or a centralized mode in which a lock is acquired from the centralized control unit.
摘要:
A database system that issues a reference transaction by designating a time stamp. Data structures are provided for making an inquiry about the latest value at a designated time using a database in which values and information on times associated with the individual values are contained in a table. One of the data structures includes, for each of IDs associated with the values in the database, at least one time stamp that is sorted in chronological order (hereinafter referred to as a first time stamp); values belonging to the individual first time stamps; and a pointer that designates one of the first time stamps, the first time stamps indicating the times when the values become valid. The other of the data structures includes, for each of the IDs, the designated first time stamp and a value belonging to the designated first time stamp.
摘要:
A database system that issues a reference transaction by designating a time stamp. Data structures are provided for making an inquiry about the latest value at a designated time using a database in which values and information on times associated with the individual values are contained in a table. One of the data structures includes, for each of IDs associated with the values in the database, at least one time stamp that is sorted in chronological order (hereinafter referred to as a first time stamp); values belonging to the individual first time stamps; and a pointer that designates one of the first time stamps, the first time stamps indicating the times when the values become valid. The other of the data structures includes, for each of the IDs, the designated first time stamp and a value belonging to the designated first time stamp.
摘要:
A method of estimating a viewing rate of a targeted message in a multicast messaging system is disclosed. A processor may be used to determine a first probability that at least one follower selects a received multicast message that accesses the targeted message using a processor. A second probability is calculated for the probability that the at least one follower accesses the targeted message from the selected multicast message. A third probability that the at least one follower views the targeted message is determined from the first probability and the second probability to determine the viewing rate of the targeted message. A message may be targeted for sending over the multicast messaging system at a time selected based on the determined third probability.
摘要:
A method of estimating a viewing rate of a targeted message in a multicast messaging system is disclosed. A processor may be used to determine a first probability that at least one follower selects a received multicast message that accesses the targeted message using a processor. A second probability is calculated for the probability that the at least one follower accesses the targeted message from the selected multicast message. A third probability that the at least one follower views the targeted message is determined from the first probability and the second probability to determine the viewing rate of the targeted message. A message may be targeted for sending over the multicast messaging system at a time selected based on the determined third probability.
摘要:
A system, a program product and an associated method is provided for data processing management in a computing environment having at least a processor. The method comprises creating in the memory an invalidation index having a plurality of rows, each row further comprising a search key field, an ID list field for IDs of records associated with the database, and a count value field. Every time a new reference query is received the processor searches for a row in said invalidation index with an already created search key and then decreases count value of a counter when a match is found and when a match is not found creating a new search key and a new row in an associated invalidation index for said new key.