Databases: storing and retrieving information
... one thing that distinguishes them. •If there’s at least one instance where the attributes of two records can take on the same value then that attribute cannot be a primary key. (When in doubt verify with your users). •If a primary key cannot be formed from a single attribute then several attributes ...
... one thing that distinguishes them. •If there’s at least one instance where the attributes of two records can take on the same value then that attribute cannot be a primary key. (When in doubt verify with your users). •If a primary key cannot be formed from a single attribute then several attributes ...
361-001_Huen.pdf
... (a) analyze the need of a database operator (scan, equality search, range search, insert, delete etc) and determine an appropriate and/or efficient algorithm (external sorting, hash, B+, clustered vs. unclustered, various join algorithms) in its implementation. (b) Implement a Relational Operation ( ...
... (a) analyze the need of a database operator (scan, equality search, range search, insert, delete etc) and determine an appropriate and/or efficient algorithm (external sorting, hash, B+, clustered vs. unclustered, various join algorithms) in its implementation. (b) Implement a Relational Operation ( ...
Database Design
... ERD can be reviewed with client (Is the design correct for the client’s needs?) Database design can be used to build the database • e.g., Build database in MS Access Can database design get more complicated than this? • Yes! • But … the previous example will suffice for MIS 320 – The lab database pr ...
... ERD can be reviewed with client (Is the design correct for the client’s needs?) Database design can be used to build the database • e.g., Build database in MS Access Can database design get more complicated than this? • Yes! • But … the previous example will suffice for MIS 320 – The lab database pr ...
MIS 320 - Western Washington University
... ERD can be reviewed with client (Is the design correct for the client’s needs?) Database design can be used to build the database • e.g., Build database in MS Access Can database design get more complicated than this? • Yes! • But … the previous example will suffice for MIS 320 – The lab database pr ...
... ERD can be reviewed with client (Is the design correct for the client’s needs?) Database design can be used to build the database • e.g., Build database in MS Access Can database design get more complicated than this? • Yes! • But … the previous example will suffice for MIS 320 – The lab database pr ...
MySQL Workbench - Data Management and Data Exploration
... A storage engine is an underlying software that a RDBMS uses to manage the data in its database. MySQL offers a variety of storage engines that can be used in the same database. A transaction is a collection of operations that are combined in one statement. This statement is either fully executed or ...
... A storage engine is an underlying software that a RDBMS uses to manage the data in its database. MySQL offers a variety of storage engines that can be used in the same database. A transaction is a collection of operations that are combined in one statement. This statement is either fully executed or ...
Peace of mind: Quick Tour through the New SQL server
... • Extended support for conversion of Non-ANSI joins for DELETE and UPDATE statements. • Removed dependency on separate SYSDB database on target SQL Server. ...
... • Extended support for conversion of Non-ANSI joins for DELETE and UPDATE statements. • Removed dependency on separate SYSDB database on target SQL Server. ...
Chapter 12: Indexing and Hashing
... key value Ki, or to a bucket of pointers to file records, each record having search-key value Ki. Only need bucket structure if search-key does not form a primary key. If Li, Lj are leaf nodes and i < j, Li’s search-key values are less than Lj’s ...
... key value Ki, or to a bucket of pointers to file records, each record having search-key value Ki. Only need bucket structure if search-key does not form a primary key. If Li, Lj are leaf nodes and i < j, Li’s search-key values are less than Lj’s ...
Python: Strings - CS-People by full name
... >>> db.rollback() • to make permanent all changes made during a transaction: >>> db.commit() • committing or rolling back a transaction begins a new one • If an error occurs when executing a command, you need to rollback the current transaction before issuing other commands. ...
... >>> db.rollback() • to make permanent all changes made during a transaction: >>> db.commit() • committing or rolling back a transaction begins a new one • If an error occurs when executing a command, you need to rollback the current transaction before issuing other commands. ...
Two Phase Locking - Department of Computer Science
... • The part of the DBMS that keeps track of the locks issued to transactions is call the lock manager. The lock manager maintains a lock table which is a hash table with data object identifier as the key. The DBMS also maintains a descriptive entry for each transaction in a transaction table. The ent ...
... • The part of the DBMS that keeps track of the locks issued to transactions is call the lock manager. The lock manager maintains a lock table which is a hash table with data object identifier as the key. The DBMS also maintains a descriptive entry for each transaction in a transaction table. The ent ...
Introduction - CSE, IIT Bombay
... “buried” in program code rather than being stated explicitly Hard to add new constraints or change existing ones ...
... “buried” in program code rather than being stated explicitly Hard to add new constraints or change existing ones ...
ADVANCED SQL AND PL/SQL TOPICS
... • Parameter mode describes how the program unit can change the parameter value: – IN - specifies a parameter that is passed to the program unit as a read-only value that the program unit cannot change. – OUT - specifies a parameter that is a write-only value that can appear only on the left side of ...
... • Parameter mode describes how the program unit can change the parameter value: – IN - specifies a parameter that is passed to the program unit as a read-only value that the program unit cannot change. – OUT - specifies a parameter that is a write-only value that can appear only on the left side of ...
BSM to DB active connections
... Why: This can be used to show if connection pool limitation needs to be increased, or to correlate slow performance of BSM because there isn’t enough objects in the pool for their installation. This more likely will occur in Large and Extra-Large installations. ...
... Why: This can be used to show if connection pool limitation needs to be increased, or to correlate slow performance of BSM because there isn’t enough objects in the pool for their installation. This more likely will occur in Large and Extra-Large installations. ...
1.2 One-to-Many Relationships and Foreign Keys
... • In theory, you could have a database consisting of one table, containing information about just one type of entity. • In practice, a database will store information about more than one type of entity and will consist of more than one table. • Each table in a database has to be related in some way ...
... • In theory, you could have a database consisting of one table, containing information about just one type of entity. • In practice, a database will store information about more than one type of entity and will consist of more than one table. • Each table in a database has to be related in some way ...
Introduction to Database Systems
... entry is forced to a safe location. (write ahead log (WAL) protocol; OS support for this is often inadequate.) After a crash, the effects of partially executed transactions are undone using the log. (Thanks to WAL, if log entry wasn’t saved before the crash, corresponding change was not applied to ...
... entry is forced to a safe location. (write ahead log (WAL) protocol; OS support for this is often inadequate.) After a crash, the effects of partially executed transactions are undone using the log. (Thanks to WAL, if log entry wasn’t saved before the crash, corresponding change was not applied to ...
Slide 1
... A computed field is a calculation that a DBMS performs during processing and stores temporarily Uppercase and lowercase are not always treated the same – Case sensitive database Use field formats to show what the data is supposed to look like when it’s entered Use field validation rules to f ...
... A computed field is a calculation that a DBMS performs during processing and stores temporarily Uppercase and lowercase are not always treated the same – Case sensitive database Use field formats to show what the data is supposed to look like when it’s entered Use field validation rules to f ...
Coordinating Database and Programming Language Research∗
... are authentication and authorization. Databases typically have an authentication model based on login IDs. Programming languages do not have predefined authentication models, although the current user is typically represented as an application object. In an enterprise system, the application server ...
... are authentication and authorization. Databases typically have an authentication model based on login IDs. Programming languages do not have predefined authentication models, although the current user is typically represented as an application object. In an enterprise system, the application server ...
Tutorial on creating Databases with the MySQL DBManager
... The UPDATE statement has four clauses. In the UPDATE clause, you must specify a table name containing the fields to update. You may not update multiple tables simultaneously. The SET clause contains the list of fields you wish to update. You separate the list with commas. Each item in the list consi ...
... The UPDATE statement has four clauses. In the UPDATE clause, you must specify a table name containing the fields to update. You may not update multiple tables simultaneously. The SET clause contains the list of fields you wish to update. You separate the list with commas. Each item in the list consi ...
DBMS.pdf
... SQL statements without parameters are normally executed using Statement objects. If the same SQL statement is executed many times, it is more efficient to use: public abstract PreparedStatement prepareStatement ( String sql) throws SQLException A SQL statement can be pre-compiled and stored in a Pre ...
... SQL statements without parameters are normally executed using Statement objects. If the same SQL statement is executed many times, it is more efficient to use: public abstract PreparedStatement prepareStatement ( String sql) throws SQLException A SQL statement can be pre-compiled and stored in a Pre ...
2. Background on Data Management
... blocks, cylinders, etc. for hard disk) • Archiving on tertiary media – To prevent data loss due to common secondary storage failures – To free secondary storage resources from data that is not frequently used – For long-time documentation purposes required due to legal requirements ...
... blocks, cylinders, etc. for hard disk) • Archiving on tertiary media – To prevent data loss due to common secondary storage failures – To free secondary storage resources from data that is not frequently used – For long-time documentation purposes required due to legal requirements ...
GoldenGate For Real-Time Data Warehousing
... however the penalty that must be paid is that the index itself may require update and maintenance as transactions are added, removed or updated from the database. The inevitable result is that processing is slowed down. For these reasons, many organizations implemented data warehouses comprising sep ...
... however the penalty that must be paid is that the index itself may require update and maintenance as transactions are added, removed or updated from the database. The inevitable result is that processing is slowed down. For these reasons, many organizations implemented data warehouses comprising sep ...