precedence graph वाक्य
उदाहरण वाक्य
मोबाइल
- A precedence graph of the schedule D, with 3 transactions.
- :In the "'precedence graph "'transactions are nodes and precedence relations are directed edges.
- A deadlock is a reflection of a potential cycle in the " precedence graph ", that would occur without the blocking.
- A deadlock is a reflection of a potential cycle in the precedence graph, that would occur without the blocking when conflicts are materialized.
- This means that a cycle consisting of committed transactions only is generated in the ( general ) precedence graph, if and only if conflict-serializability is violated.
- A cycle of committed transactions ( with materialized conflicts ) in the " precedence graph " ( conflict graph ) represents a serializability violation, and should be avoided for maintaining serializability.
- Schedule compliance with conflict serializability can be tested with the precedence graph ( " serializability graph ", " serialization graph ", " conflict graph " ) for committed transactions of the schedule.
- Cycles of committed transactions can be prevented by aborting an " undecided " ( neither committed, nor aborted ) transaction on each cycle in the precedence graph of all the transactions, which can otherwise turn into a cycle of committed transactions ( and a committed transaction cannot be aborted ).
- As a result, access by another transaction may be blocked, typically upon a conflict ( the lock delays or completely prevents the conflict from being materialized and be reflected in the precedence graph by blocking the conflicting operation ), depending on lock type and the other transaction's access operation type.
- Another definition for conflict-serializability is that a schedule is conflict-serializable if and only if its precedence graph / serializability graph, when only committed transactions are considered, is acyclic ( if the graph is defined to include also uncommitted transactions, then cycles involving uncommitted transactions may occur without conflict serializability violation ).
- In a CO schedule the commitment events'( directed ) conflict graph ( precedence graph, serializability graph ), as induced by their conflicting access operations ( usually read and write ( insert / modify / delete ) operations; CO also applies to higher level operations, where they are conflicting if noncommutative, as well as to conflicts between operations upon multi-version data ).
- It is often detected using a " wait-for graph " ( a graph of conflicts blocked by locks from being materialized; conflicts not materialized in the database due to blocked operations are not reflected in the precedence graph and do not affect " serializability " ), which indicates which transaction is " waiting for " lock release by which transaction, and a cycle means a deadlock.
- It is often detected using a " wait-for graph " ( a graph of conflicts blocked by locks from being materialized; it can be also defined as the graph of non-materialized conflicts; conflicts not materialized are not reflected in the precedence graph and do not affect serializability ), which indicates which transaction is " waiting for " lock release by which transaction, and a cycle means a deadlock.
- There exists an edge from a first transaction to a second transaction, if the second transaction is " in conflict " with the first ( see Conflict serializability above ), and the conflict is "'materialized "'( i . e ., if the requested conflicting operation is actually executed : in many cases a requested / issued conflicting operation by a transaction is delayed and even never executed, typically by a lock on the operation's object, held by another transaction, or when writing to a transaction's temporary private workspace and materializing, copying to the database itself, upon commit; as long as a requested / issued conflicting operation is not executed upon the database itself, the conflict is "'non-materialized "'; non-materialized conflicts are not represented by an edge in the precedence graph ).
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