Abstract: A database is replicated to other systems using multisite table(s) and associated replication trigger logic. Each system includes a main table, multisite table(s) and replication trigger logic. A multisite table corresponds to a main table of another system. When a main table of a system is changed, in response to an input, the system generates and sends replication transactions to the other systems for changing main tables in the other systems. In accordance with the change specified in the replication transaction, the multisite tables are modified. In each system, the replication trigger logic determines whether or not to replicate the change specified in the replication transaction to the main table of the each system, upon application of the replication trigger logic to the replication transaction. The change specified in the replication transaction may relate to inserting, deleting, or updating a record in the main table.

Abstract: Systems and techniques are provided for identifying and tracing an individual session of a web application hosted at a server in a network communication system, based on a request message from a client requesting a function of the web application. Data stored in a database may be accessed by one or more virtual machines executing at the server via one or more data connections from a connection pool allocated to each of the virtual machines. Reference and logging information are stored for each virtual machine and corresponding connection pool, thereby enabling operations performed by each virtual machine for the requested function to be traced with a relatively high degree of granularity at each of various functional layers or tiers of the network communication system.