Database System Concepts, 6 th Ed
... The null value causes complications in the definition of many ...
... The null value causes complications in the definition of many ...
H o w
... data collide with each other, causing one to wait because the data elements happen to reside on the same page. False waits not only cause undesirable lock waits, but can also cause false deadlocks, where transactions are needlessly rolled back and reapplied, wasting system resources and irritating e ...
... data collide with each other, causing one to wait because the data elements happen to reside on the same page. False waits not only cause undesirable lock waits, but can also cause false deadlocks, where transactions are needlessly rolled back and reapplied, wasting system resources and irritating e ...
Last saved 27 September 2004
... written into the database correctly. The Database Key screen lists the database ID code, subject name, session number, and session date for all subjects and sessions in the database. This is useful to create a key tying the subject names to their database codes. The Query Database screen lists all s ...
... written into the database correctly. The Database Key screen lists the database ID code, subject name, session number, and session date for all subjects and sessions in the database. This is useful to create a key tying the subject names to their database codes. The Query Database screen lists all s ...
Bind Variables, Dynamic SQL, and other catastrophes
... Best Practice in Database Design for Performance can take only one badly written SQL statement to cause a problem – regardless of the fact that YOUR queries are 100% optimised and well written. As an application developer, you do not want to find yourself in a situation that every query you issue f ...
... Best Practice in Database Design for Performance can take only one badly written SQL statement to cause a problem – regardless of the fact that YOUR queries are 100% optimised and well written. As an application developer, you do not want to find yourself in a situation that every query you issue f ...
chap 15
... Ensuring that the RDBMS Starts Automatically • DBA ensures database access is automatically started when computer turned on • A service is a Windows system name for a special program that runs automatically – Part of the operating system ...
... Ensuring that the RDBMS Starts Automatically • DBA ensures database access is automatically started when computer turned on • A service is a Windows system name for a special program that runs automatically – Part of the operating system ...
Performance of scalable, distributed database system built on
... structures one would then like to be able to search these structures for molecules whose 3D shape is similar to that of a query. To address the lack of 3D information in PubChem, to provide 3D shape searching capabilities and to allow efficient queries, Pub3D database employing a 12-D shape represe ...
... structures one would then like to be able to search these structures for molecules whose 3D shape is similar to that of a query. To address the lack of 3D information in PubChem, to provide 3D shape searching capabilities and to allow efficient queries, Pub3D database employing a 12-D shape represe ...
Distributed Database Systems
... obtain locks on all modified copies. – Sends lock requests to remote sites, and while waiting for the response, holds on to other locks! – If sites or links fail, Xact cannot commit until they are back up. – Even if there is no failure, committing must follow an expensive commit protocol with many m ...
... obtain locks on all modified copies. – Sends lock requests to remote sites, and while waiting for the response, holds on to other locks! – If sites or links fail, Xact cannot commit until they are back up. – Even if there is no failure, committing must follow an expensive commit protocol with many m ...
Distributed Databases
... obtain locks on all modified copies. – Sends lock requests to remote sites, and while waiting for the response, holds on to other locks! – If sites or links fail, Xact cannot commit until they are back up. – Even if there is no failure, committing must follow an expensive commit protocol with many m ...
... obtain locks on all modified copies. – Sends lock requests to remote sites, and while waiting for the response, holds on to other locks! – If sites or links fail, Xact cannot commit until they are back up. – Even if there is no failure, committing must follow an expensive commit protocol with many m ...
“surya pratap singh” becomes
... system that deal with personal information. Owner should know to what extent information about them has been collected and how the information will be used and how they are able to control their own information. They explained Hippocratic database used the purpose as a central concept in the databas ...
... system that deal with personal information. Owner should know to what extent information about them has been collected and how the information will be used and how they are able to control their own information. They explained Hippocratic database used the purpose as a central concept in the databas ...
... A database is a collection of relational data. In the much earlier days proprietary languages written in COBOL (Common Business Oriented Language), C, and so on were used to manipulate respective database records. This is because relational databases did not have a set of commands to work with the d ...
Slides
... obtain locks on all modified copies. – Sends lock requests to remote sites, and while waiting for the response, holds on to other locks! – If sites or links fail, Xact cannot commit until they are back up. – Even if there is no failure, committing must follow an expensive commit protocol with many m ...
... obtain locks on all modified copies. – Sends lock requests to remote sites, and while waiting for the response, holds on to other locks! – If sites or links fail, Xact cannot commit until they are back up. – Even if there is no failure, committing must follow an expensive commit protocol with many m ...
What are the security issues in database management
... this. But it has really been focused on perimeter- and network-based security solutions and as our research shows, only 10% of databases have gotten that kind of focus so our message is that you have to protect the data where it lives - in the database. It is kind of like a bank locking the front do ...
... this. But it has really been focused on perimeter- and network-based security solutions and as our research shows, only 10% of databases have gotten that kind of focus so our message is that you have to protect the data where it lives - in the database. It is kind of like a bank locking the front do ...
12.2_InMemory_new_features
... In-Memory Expressions The Expression Statistics Store (ESS) automatically tracks the results of frequently evaluated (“hot”) expressions Invoke the IME_CAPTURE_EXPRESSIONS procedure which is part of the DBMS_INMEMORY_ADMIN package Queries the ESS, and identifies the 20 most frequently accesse ...
... In-Memory Expressions The Expression Statistics Store (ESS) automatically tracks the results of frequently evaluated (“hot”) expressions Invoke the IME_CAPTURE_EXPRESSIONS procedure which is part of the DBMS_INMEMORY_ADMIN package Queries the ESS, and identifies the 20 most frequently accesse ...
Lecture 6 - Relational Algebra I
... A basic expression in the relational algebra consists of either one ...
... A basic expression in the relational algebra consists of either one ...
Spatio-Temporal Database
... Building new STIS on existing SIS Utilization of a data warehouse, enabling several legacy systems to be incorporated in a data-supply role ...
... Building new STIS on existing SIS Utilization of a data warehouse, enabling several legacy systems to be incorporated in a data-supply role ...
What is a Database
... Physical Data Independence – the ability to modify the physical schema without changing the logical schema A fundamental requirement for database management systems Applications depend on the logical schema In general, the interfaces between the various levels and components should be well def ...
... Physical Data Independence – the ability to modify the physical schema without changing the logical schema A fundamental requirement for database management systems Applications depend on the logical schema In general, the interfaces between the various levels and components should be well def ...
3 Architecture
... HADR protects against data loss by replicating data changes from the primary database to the secondary database. All changes that take place at the primary database are written to the DB2 logs. These logs are shipped to the secondary database server, where the log records are replayed to the local c ...
... HADR protects against data loss by replicating data changes from the primary database to the secondary database. All changes that take place at the primary database are written to the DB2 logs. These logs are shipped to the secondary database server, where the log records are replayed to the local c ...
What will happen if we run count(*) with limit statement? It will return
... Committing a transaction means making permanent the changes performed by the SQL statements within the transaction. Before a transaction that modifies data is committed, the following has occurred: Oracle has generated undo information. The undo information contains the old data values changed by th ...
... Committing a transaction means making permanent the changes performed by the SQL statements within the transaction. Before a transaction that modifies data is committed, the following has occurred: Oracle has generated undo information. The undo information contains the old data values changed by th ...
Connection - Chen Li -
... • Use setQueryTimeOut to set a timeout for the driver to wait for a statement to be completed • If the operation is not completed in the given time, an SQLException is thrown • What is it good for? ...
... • Use setQueryTimeOut to set a timeout for the driver to wait for a statement to be completed • If the operation is not completed in the given time, an SQLException is thrown • What is it good for? ...
Logging and Recovery
... The Write-Ahead Logging Protocol: must force the log record for an update before the corresponding data page gets to disk must write all log records for a Xact before ...
... The Write-Ahead Logging Protocol: must force the log record for an update before the corresponding data page gets to disk must write all log records for a Xact before ...
Disk and I/O Tuning on SQL Server 2005
... – Folder permissions – Encryption disk/take • Show me!!! ...
... – Folder permissions – Encryption disk/take • Show me!!! ...
Database Mirroring
... Read-only, invisible/transparent to users Allows for fast, side-by-side upgrades No scripts to run to upgrade system procs master is upgraded during the Upgrade process Other databases are upgraded as part of database startup – once master is complete ...
... Read-only, invisible/transparent to users Allows for fast, side-by-side upgrades No scripts to run to upgrade system procs master is upgraded during the Upgrade process Other databases are upgraded as part of database startup – once master is complete ...
JDBC Contents
... Creates a Statement object for sending SQL statements to the database. SQL statements without parameters are normally executed using Statement objects. ...
... Creates a Statement object for sending SQL statements to the database. SQL statements without parameters are normally executed using Statement objects. ...
Distributed Databases
... A second objective of distributed databases is local autonomy, which is the capability to administer a local database and to operate independently when connections to other nodes have failed (Date, 1995). With local autonomy, each site has the capability to control local data, administer security, a ...
... A second objective of distributed databases is local autonomy, which is the capability to administer a local database and to operate independently when connections to other nodes have failed (Date, 1995). With local autonomy, each site has the capability to control local data, administer security, a ...