Maintenance.of..................... Association.Rules.Using. Pre
... association rules and avoiding the above-mentioned shortcomings when new transactions are inserted. Examples include the FUP algorithm (Cheung et al., 1996), the adaptive algorithm (Sarda & Srinivas, 1998), and the incremental updating technique based on the concept of negative border (Feldman, Auma ...
... association rules and avoiding the above-mentioned shortcomings when new transactions are inserted. Examples include the FUP algorithm (Cheung et al., 1996), the adaptive algorithm (Sarda & Srinivas, 1998), and the incremental updating technique based on the concept of negative border (Feldman, Auma ...
Document
... Arcs: There is an arc from Ti to Tj if they have conflict access to the same database element X and Ti is first; ...
... Arcs: There is an arc from Ti to Tj if they have conflict access to the same database element X and Ti is first; ...
Document
... Atomicity. Either all operations of the transaction are properly reflected in the database or none are. Consistency. Execution of a transaction in isolation preserves the consistency of the database. Isolation. Although multiple transactions may execute concurrently, each transaction must be u ...
... Atomicity. Either all operations of the transaction are properly reflected in the database or none are. Consistency. Execution of a transaction in isolation preserves the consistency of the database. Isolation. Although multiple transactions may execute concurrently, each transaction must be u ...
Chapter 16 - Computer Information Systems
... 7. Add secondary index on attributes that could result in an index-only plan. 8. Avoid indexing an attribute or relation that is frequently updated. Avoid indexing an attribute if the query will retrieve a significant proportion of the tuples in the relation. 9. Avoid indexing attributes that consis ...
... 7. Add secondary index on attributes that could result in an index-only plan. 8. Avoid indexing an attribute or relation that is frequently updated. Avoid indexing an attribute if the query will retrieve a significant proportion of the tuples in the relation. 9. Avoid indexing attributes that consis ...
THE DATABLITZ™ MAIN-MEMORY STORAGE MANAGER
... Figure 3. Throughput as a Function of Operations per Transaction this. For sufficiently large transactions, the commit overhead is an insignificant fraction of overall execution time and thus the throughput curve levels off. The figure shows that the low-level hash-index interface offers roughly a f ...
... Figure 3. Throughput as a Function of Operations per Transaction this. For sufficiently large transactions, the commit overhead is an insignificant fraction of overall execution time and thus the throughput curve levels off. The figure shows that the low-level hash-index interface offers roughly a f ...
Infobright Enterprise Edition
... “Within one month [of installation], the whole ting was paid for. Within 10 months, when everyone else’s business was decreasing, ours was tripling. While the industry went down 50% [due to recession], we tripled our business, and in the worst economy in history.” ...
... “Within one month [of installation], the whole ting was paid for. Within 10 months, when everyone else’s business was decreasing, ours was tripling. While the industry went down 50% [due to recession], we tripled our business, and in the worst economy in history.” ...
A Closer Look
... Result: Database state no longer corresponds to real-world state, integrity constraint violated. ...
... Result: Database state no longer corresponds to real-world state, integrity constraint violated. ...
John Hawkins - Research Presentation
... Runs on the Java Virtual Machine, which allows it to be run on almost any machine in the modern world. Has APIs written in C / C++, Ruby, PHP, and Java Because of its use of HTTP, can be easily distributed across multiple machines. ...
... Runs on the Java Virtual Machine, which allows it to be run on almost any machine in the modern world. Has APIs written in C / C++, Ruby, PHP, and Java Because of its use of HTTP, can be easily distributed across multiple machines. ...
+ Database Consistency
... A deposit transaction that increments the balance by the wrong amount maintains the integrity constraint balance 0, but does not maintain the relation between the enterprise and database states ...
... A deposit transaction that increments the balance by the wrong amount maintains the integrity constraint balance 0, but does not maintain the relation between the enterprise and database states ...
job description
... Reporting into the Deputy COO, the successful Database Development Director will be responsible for supporting the development of a multi-million pound product portfolio across multiple business units. This exciting strategic and tactical role will provide leadership for the database development tea ...
... Reporting into the Deputy COO, the successful Database Development Director will be responsible for supporting the development of a multi-million pound product portfolio across multiple business units. This exciting strategic and tactical role will provide leadership for the database development tea ...
20160425145340assignment_week_7
... USE THE AdventureWorks2012 database for the following: 1. Use sp_configure to grant the first parameter to all users by default, show advanced options and run reconfigure. Use sp_configure to change the maximum lock settings from 0 to 20000 using the locks option and run reconfigure. Copy and paste ...
... USE THE AdventureWorks2012 database for the following: 1. Use sp_configure to grant the first parameter to all users by default, show advanced options and run reconfigure. Use sp_configure to change the maximum lock settings from 0 to 20000 using the locks option and run reconfigure. Copy and paste ...
Transactions in Oracle
... • Autonomous transactions are independent transactions that can be called from within another transaction • An autonomous transaction lets you leave the context of the calling transaction • You can call autonomous transactions from within a PL/SQL block by using the pragma AUTONOMOUS_TRANSACTION. ...
... • Autonomous transactions are independent transactions that can be called from within another transaction • An autonomous transaction lets you leave the context of the calling transaction • You can call autonomous transactions from within a PL/SQL block by using the pragma AUTONOMOUS_TRANSACTION. ...
CH9
... A shared lock is issued when a transaction wants to read data from the database and no exclusive lock is held on that data item. ...
... A shared lock is issued when a transaction wants to read data from the database and no exclusive lock is held on that data item. ...
Transaction Management
... Keep track of all transactions that update the DB If failure occurs, information that was stored here will be used for recovery It is triggered by ROLL BACK statement, program abnormal termination, or system failure ...
... Keep track of all transactions that update the DB If failure occurs, information that was stored here will be used for recovery It is triggered by ROLL BACK statement, program abnormal termination, or system failure ...
transaction
... A (possibly concurrent) schedule is serializable if it is equivalent to a serial schedule. Different forms of schedule equivalence give rise to the notions of: 1. conflict serializability 2. view serializability Simplified view of transactions We ignore operations other than read and write instruc ...
... A (possibly concurrent) schedule is serializable if it is equivalent to a serial schedule. Different forms of schedule equivalence give rise to the notions of: 1. conflict serializability 2. view serializability Simplified view of transactions We ignore operations other than read and write instruc ...
Transactions - Computer Information Systems
... Isolation - Actions are not visible to other transactions until it is committed. Data used during execution of transaction cannot be used by second transaction until first one is completed, i.e. transaction’s updates concealed until after commit. Durability (permanency)- Indicates the permanence of ...
... Isolation - Actions are not visible to other transactions until it is committed. Data used during execution of transaction cannot be used by second transaction until first one is completed, i.e. transaction’s updates concealed until after commit. Durability (permanency)- Indicates the permanence of ...
S-Store: Streaming Meets Transaction Processing
... which has no such trigger support in its PE. • Serializing transaction requests severely limits H-Store’s performance where as S-Store uses a “streaming scheduler” which can activate the next transaction directly within the PE and can prioritize these triggered transactions ahead of the current sche ...
... which has no such trigger support in its PE. • Serializing transaction requests severely limits H-Store’s performance where as S-Store uses a “streaming scheduler” which can activate the next transaction directly within the PE and can prioritize these triggered transactions ahead of the current sche ...
transaction
... • 2PL is most common, but has an considerable overhead due to deadlock management, especially in case of conflicts • time stamps: concurrency control is done on the affected object, and hence is a very nice strategy in distributed systems and in the case of few conflicts • optimistic methods: effici ...
... • 2PL is most common, but has an considerable overhead due to deadlock management, especially in case of conflicts • time stamps: concurrency control is done on the affected object, and hence is a very nice strategy in distributed systems and in the case of few conflicts • optimistic methods: effici ...
What Are Locks?
... Transactions ensure that multiple data modifications are processed together or not at all The transaction log ensures that updates are complete and recoverable Transactions use locks ...
... Transactions ensure that multiple data modifications are processed together or not at all The transaction log ensures that updates are complete and recoverable Transactions use locks ...
Technical Report I
... necessary to have a backup copy and to keep a log of transaction activity Before a transaction can commit, its activity records must be written to the log. Logging can impact response time, since each transaction must wait for at least one stable write before committing. Logging can also affect thro ...
... necessary to have a backup copy and to keep a log of transaction activity Before a transaction can commit, its activity records must be written to the log. Logging can impact response time, since each transaction must wait for at least one stable write before committing. Logging can also affect thro ...