SET SERVEROUTPUT ON DECLARE v_rowid ROWID; BEGIN SELECT rowid INTO v_rowid FROM emp WHERE empno = 7876; DBMS_OUTPUT.PUT_LINE(owa_opt_lock.checksum('SCOTT','EMP', v_rowid)); END; /When performing the update we check that the checksum has not changed. If it has we know the data ...
Summary: Based on XTC, we have redesigned, reimplemented, and reoptimized BrackitDB, a native XML DBMS (XDBMS). Inspired by "optimal" concurrency gained on XTC using the taDOM protocol, we applied an XML benchmark on BrackitDB running now on a substantially different computer platform. We ...
In the proposed scheme, locks are required for the execution of methods instead of atomic operations. This can reduce the locking overhead and deadlocks due to lock escalation. Also, a way of automating commutativity of methods is provided. In addition, concurrency is increased further by use ...
The in-memory session tracking was protected with a locking mechanism such that three methods must be called in order to update it. The update of the database is completed with a single method. When implementing the login, the developers coded the following sequence:aquireSessionCountLock update...
And here optimistic or pessimistic locking methods are used. In pessimistic method the record is locked before the user A modifies values on the screen (for example user A clicks "update" button which locks the row), and the lock is held until user A saves (commits) his changes to the...
Yasmin Akbar-Husain and Eoin Lane show how to construct an optimistic locking solution that produces transactionally safe EJB code, portable across all application servers. The authors implement the solution in a versioned entity bean for fail-safe concu
Error in Query : Msg 258, Cannot call methods on varchar. Error in query: [..not a valid identifier] Error in Update SP using TableValued parameter Error in view when using CONVERT(Date,GETDATE()) error message when remove log file Error Msg when sending email using sp_send_dbmail Erro...
A decomposition solution to the queueing network model of the centralized DBMS with static locking The effect of concurrency control methods on the performance of computer systems is analyzed in the context of a centralized database with a static lock request policy, i.e., database transactions sh...
including methods such as those described in connection with FIG. 5 and FIG. 6. The arrows of system400as shown in FIG. 4 indicate some of the example communications, interactions and data flows between elements of system400but do not represent the only communications, interactions or the like...
Methods and systems for deploying a database are described. In an example, a processor can generate an object that specifies a set of data from the database, a set of dependencies associated with the set of data, and a set of changes applicable to the set of data. The processor can det...