TransactionsAndRecovery
... Saving the initial database state D1 before starting the transaction T: D1->D2 (transaction begins) Saving all intermediate states D11, D12 … (checkpoint logs) In the case of a failure at an intermediate state D1i before reaching D2, restore D1 (rollback); the simplest strategy is to apply a series ...
... Saving the initial database state D1 before starting the transaction T: D1->D2 (transaction begins) Saving all intermediate states D11, D12 … (checkpoint logs) In the case of a failure at an intermediate state D1i before reaching D2, restore D1 (rollback); the simplest strategy is to apply a series ...
CSE-302-NewTransaction
... Once a transaction’s execution is successfully shifted (along with all prewrite logs and pre-commit log) to the MSS, a MH may delete all the log records and keep only prewrite values in main memory for further processing. This way it can gradually discard entries in prewrite logs. To build highly re ...
... Once a transaction’s execution is successfully shifted (along with all prewrite logs and pre-commit log) to the MSS, a MH may delete all the log records and keep only prewrite values in main memory for further processing. This way it can gradually discard entries in prewrite logs. To build highly re ...
Windows Azure SQL Database - Bapatla Engineering College
... Custom Create. In this page, you provide basic information that creates an empty database on the server. Adding tables and data will come in a later step. Fill out the Database Settings page as follows: ...
... Custom Create. In this page, you provide basic information that creates an empty database on the server. Adding tables and data will come in a later step. Fill out the Database Settings page as follows: ...
Kroenke-DBC-e02-PP
... Create supporting structures Read database data Modify database data (insert, update, delete) Maintain database structures Enforce rules Control concurrency Provide security Perform backup and recovery ...
... Create supporting structures Read database data Modify database data (insert, update, delete) Maintain database structures Enforce rules Control concurrency Provide security Perform backup and recovery ...
tong - Cal State LA
... • Search submission interface which lets you access Paracel algorithms without entering the command-line environment ...
... • Search submission interface which lets you access Paracel algorithms without entering the command-line environment ...
Introduction
... Similar to types and variables in programming languages Schema – the logical structure of the database Analogous to type information of a variable in a program Physical schema: database design at the physical level Logical schema: database design at the logical level View schema: database design at ...
... Similar to types and variables in programming languages Schema – the logical structure of the database Analogous to type information of a variable in a program Physical schema: database design at the physical level Logical schema: database design at the logical level View schema: database design at ...
ASET - WordPress.com
... • Integrity constraints (e.g., account balance > 0) become “buried” in program code rather than being stated explicitly • Hard to add new constraints or change existing ones ...
... • Integrity constraints (e.g., account balance > 0) become “buried” in program code rather than being stated explicitly • Hard to add new constraints or change existing ones ...
Chapter 10
... to Ensure Serializability (continued) • Governed by the following rules: – Two transactions cannot have conflicting locks – No unlock operation can precede a lock operation in the same transaction – No data are affected until all locks are obtained—that is, until transaction is in its ...
... to Ensure Serializability (continued) • Governed by the following rules: – Two transactions cannot have conflicting locks – No unlock operation can precede a lock operation in the same transaction – No data are affected until all locks are obtained—that is, until transaction is in its ...
(A) write_item (B)
... To bring the database into the last consistent state, which existed prior to the failure. • To preserve transaction properties (Atomicity, Consistency, Isolation and Durability). Example: If the system crashes before a fund transfer transaction completes its execution, then either one or both accoun ...
... To bring the database into the last consistent state, which existed prior to the failure. • To preserve transaction properties (Atomicity, Consistency, Isolation and Durability). Example: If the system crashes before a fund transfer transaction completes its execution, then either one or both accoun ...
Entity
... A primary key is a special attribute used to represent an instance of an entity or relationship in a database Must be unique and universal Can be a concatenated (combined key) “No representation without identification” For this class, we assume that relationships are identified by the keys o ...
... A primary key is a special attribute used to represent an instance of an entity or relationship in a database Must be unique and universal Can be a concatenated (combined key) “No representation without identification” For this class, we assume that relationships are identified by the keys o ...
Chapter 10
... • Transaction is logical unit of work that must be either entirely completed or aborted • Successful transaction changes database from one consistent state to another – One in which all data integrity constraints are satisfied ...
... • Transaction is logical unit of work that must be either entirely completed or aborted • Successful transaction changes database from one consistent state to another – One in which all data integrity constraints are satisfied ...
Slide 1
... such a configuration, you will only need to deploy the JDBC jar file with your database accessing program. The other options include a JDBC bridge, which really means an ODBC connection wrapped in JDBC clothing. This means you would have to configure your system for correct ODBC function, and then u ...
... such a configuration, you will only need to deploy the JDBC jar file with your database accessing program. The other options include a JDBC bridge, which really means an ODBC connection wrapped in JDBC clothing. This means you would have to configure your system for correct ODBC function, and then u ...
Information System Development Courses
... Definition of tables, different type of queries, views, constraints and triggers, active database systems. SQL in programming environment. ODL, OQL, basics of the object-relational model, SQL:1999 object extensions; XML and its data model, XQUERY transaction management, recovery, concurrency control ...
... Definition of tables, different type of queries, views, constraints and triggers, active database systems. SQL in programming environment. ODL, OQL, basics of the object-relational model, SQL:1999 object extensions; XML and its data model, XQUERY transaction management, recovery, concurrency control ...
Document
... Data independence: Application programs not dependent on data representation and storage details Data sharing: data is better utilized (discovered and reused), redundancy of data is minimized Data integrity and consistency: one may enforce consistency constraints on data, e.g., number of seats sold ...
... Data independence: Application programs not dependent on data representation and storage details Data sharing: data is better utilized (discovered and reused), redundancy of data is minimized Data integrity and consistency: one may enforce consistency constraints on data, e.g., number of seats sold ...
PowerPoint Chapter 10
... to Ensure Serializability (continued) • Governed by the following rules: – Two transactions cannot have conflicting locks – No unlock operation can precede a lock operation in the same transaction – No data are affected until all locks are obtained—that is, until transaction is in its ...
... to Ensure Serializability (continued) • Governed by the following rules: – Two transactions cannot have conflicting locks – No unlock operation can precede a lock operation in the same transaction – No data are affected until all locks are obtained—that is, until transaction is in its ...
Database Applications
... The company owns a number of cars. For each car there is a need to know its type, year of manufacturing, number of places in the car and date of the last service. The company wants to have a record of car trips (körningar). A taxi may be picked on a street or ordered though an operator who assigns t ...
... The company owns a number of cars. For each car there is a need to know its type, year of manufacturing, number of places in the car and date of the last service. The company wants to have a record of car trips (körningar). A taxi may be picked on a street or ordered though an operator who assigns t ...
Chapter 2
... DBMS functionality, application program execution, and user interface processing were carried out on a single machine ...
... DBMS functionality, application program execution, and user interface processing were carried out on a single machine ...
Chapter 6: Integrity and Security
... When an assertion is created, the system will test it for validity. If the assertion is valid, then any future modification to the database is allowed only if it does not cause the assertion to be violated. But assertions can create a considerable amount of overhead, especially if complex assert ...
... When an assertion is created, the system will test it for validity. If the assertion is valid, then any future modification to the database is allowed only if it does not cause the assertion to be violated. But assertions can create a considerable amount of overhead, especially if complex assert ...
IT360 12 week Exam Review Sheet 2. PHP - general
... b. control statements (if, for, foreach, while, …) c. files d. functions e. objects/classes, inheritance 3. PHP - Work with MySQL Connect to a database Query process results close connection 4. Session variables 5. Stored Procedures and Triggers a. A stored procedure is a program that perfor ...
... b. control statements (if, for, foreach, while, …) c. files d. functions e. objects/classes, inheritance 3. PHP - Work with MySQL Connect to a database Query process results close connection 4. Session variables 5. Stored Procedures and Triggers a. A stored procedure is a program that perfor ...