Transactions
... • Constraints may be explicit or implicit • A transaction must take a database from a consistent state to a consistent state What it means for us: nothing, follows from Atomicity and Isolation ...
... • Constraints may be explicit or implicit • A transaction must take a database from a consistent state to a consistent state What it means for us: nothing, follows from Atomicity and Isolation ...
Overview of Data Modeling Using IBM Graphical Tools
... Transaction processing – Live, virtual layer in place Insert, update or delete event against view ...
... Transaction processing – Live, virtual layer in place Insert, update or delete event against view ...
PPT
... Automatically reorganizes itself with small local changes, in the face of insertions and deletions Reorganization of entire file is not required to maintain performance (Minor) disadvantage of B+-trees: Extra insertion and deletion overhead, space overhead B+-trees are used extensively ...
... Automatically reorganizes itself with small local changes, in the face of insertions and deletions Reorganization of entire file is not required to maintain performance (Minor) disadvantage of B+-trees: Extra insertion and deletion overhead, space overhead B+-trees are used extensively ...
MySQL: Database Fundamentals - UTK-EECS
... Databases are a key component of most Web-based business, storing everything from basic user credentials (e.g., username and password) to complex purchase histories. There are several facets of database systems that are courses in their own right and are beyond the scope of this document – for examp ...
... Databases are a key component of most Web-based business, storing everything from basic user credentials (e.g., username and password) to complex purchase histories. There are several facets of database systems that are courses in their own right and are beyond the scope of this document – for examp ...
lock-X
... server in turn sends the request to the database. The database sends back the information/data required to the server which inturn sends it to the client. 3.SHADOW PAGING This recovery scheme does not require the use of a log in a single-user environment. In a multiuser environment, a log may be nee ...
... server in turn sends the request to the database. The database sends back the information/data required to the server which inturn sends it to the client. 3.SHADOW PAGING This recovery scheme does not require the use of a log in a single-user environment. In a multiuser environment, a log may be nee ...
PHP Bible – Chapter 13: SQL Tutorial
... A given SQL installation can usually contain multiple databases (e.g. one for products and another for customers and another for employees, etc.) Each database contains a number of tables Each table is made up of carefully defined fields (columns) Every entry in a table can be thought of as an added ...
... A given SQL installation can usually contain multiple databases (e.g. one for products and another for customers and another for employees, etc.) Each database contains a number of tables Each table is made up of carefully defined fields (columns) Every entry in a table can be thought of as an added ...
Notes
... • deduct from one account and credit to another If one steps succeeds and the other fails, database is in an inconsistent state Therefore, either both steps should succeed or neither should ...
... • deduct from one account and credit to another If one steps succeeds and the other fails, database is in an inconsistent state Therefore, either both steps should succeed or neither should ...
Distributed Databases
... more functionality, they support units of data, such as page, tupelos, or objects that are smaller than file. They provide indexing facilities for data and provide transaction facilities so that the data are never left in an inconsistent state if client machine or process fails. ...
... more functionality, they support units of data, such as page, tupelos, or objects that are smaller than file. They provide indexing facilities for data and provide transaction facilities so that the data are never left in an inconsistent state if client machine or process fails. ...
File - Data Mining and Soft computing techniques
... trivial extraction of implicit, previously unknown, potentially useful information from data. it uses machine learning ,statistical and visualization techniques to discover and present knowledge in a form, which is easily comprehensible to humans. Data Mining is the process of exploration and analys ...
... trivial extraction of implicit, previously unknown, potentially useful information from data. it uses machine learning ,statistical and visualization techniques to discover and present knowledge in a form, which is easily comprehensible to humans. Data Mining is the process of exploration and analys ...
intro-ppt
... "Scanning the whole dataset for a single genetic sequence… like searching for a single sentence in the contents of the ...
... "Scanning the whole dataset for a single genetic sequence… like searching for a single sentence in the contents of the ...
QuotesDBAdapter.java
... public boolean updateQuote(long rowId, String title) { ContentValues args = new ContentValues(); args.put(KEY_QUOTES, title); return mDb.update(DATABASE_TABLE, args, KEY_ROWID + "=" + rowId, null) > 0; ...
... public boolean updateQuote(long rowId, String title) { ContentValues args = new ContentValues(); args.put(KEY_QUOTES, title); return mDb.update(DATABASE_TABLE, args, KEY_ROWID + "=" + rowId, null) > 0; ...
MAPR DRILL - MicroStrategy
... streaming, real-time database capabilities, and enterprise storage for developing and running innovative data applications • Advanced architecture that is 100% binary compatible with HDFS • Lowers TCO and enables global real-time data applications ...
... streaming, real-time database capabilities, and enterprise storage for developing and running innovative data applications • Advanced architecture that is 100% binary compatible with HDFS • Lowers TCO and enables global real-time data applications ...
Slides from Lecture 14 - Courses - University of California, Berkeley
... • Transactions are started with SET TRANSACTION, followed by the SQL statements • Any changes made by the SQL are made permanent by COMMIT • Part or all of a transaction can be undone using ROLLBACK IS 257 - Fall 2005 ...
... • Transactions are started with SET TRANSACTION, followed by the SQL statements • Any changes made by the SQL are made permanent by COMMIT • Part or all of a transaction can be undone using ROLLBACK IS 257 - Fall 2005 ...
Concepts of Database Management Sixth Edition
... are single-valued, each field has a distinct name, all values in a field are values of the same attribute, order of fields is immaterial, each row is distinct, and order of rows is immaterial • Relational database: collection of relations • A table’s primary key is the field or fields that uniquely ...
... are single-valued, each field has a distinct name, all values in a field are values of the same attribute, order of fields is immaterial, each row is distinct, and order of rows is immaterial • Relational database: collection of relations • A table’s primary key is the field or fields that uniquely ...
A Universal Relation Database Interface for Knowledge Based
... key names. These keys in the UQL system are not identical with the traditional concept of a key. For example, every key consists always of only one database attribute. This is not a limitation, because many keys can be selected simultaneously. The keys may also be overlapping, so that some columns m ...
... key names. These keys in the UQL system are not identical with the traditional concept of a key. For example, every key consists always of only one database attribute. This is not a limitation, because many keys can be selected simultaneously. The keys may also be overlapping, so that some columns m ...
FORM AND DATABASE DESIGN
... It consists of coloums and rows. Coloumns contains a different type of attribute. Each row corresponds to a single record. ...
... It consists of coloums and rows. Coloumns contains a different type of attribute. Each row corresponds to a single record. ...
Query Processing over a sensor network
... Query Optimization • Relies on meta-information describing the sensor network: – categories of devices, methods supported on each device, statistics concerning the usage of devices, distribution criterion, ... ...
... Query Optimization • Relies on meta-information describing the sensor network: – categories of devices, methods supported on each device, statistics concerning the usage of devices, distribution criterion, ... ...
Chapter 7
... Indexed file – records are stored in one file and the organization of those records is stored in a second file. To use an indexed file both files, the data file and the index file, must be used together. ...
... Indexed file – records are stored in one file and the organization of those records is stored in a second file. To use an indexed file both files, the data file and the index file, must be used together. ...
Database Management Systems INFS 614 – 002
... – Oracle 9i Programming: a Primer, by Rajshkhar Sunderraman, Addison Wesley, ISBN 0-201-61258-5 (or later versions) ...
... – Oracle 9i Programming: a Primer, by Rajshkhar Sunderraman, Addison Wesley, ISBN 0-201-61258-5 (or later versions) ...
A simple approach to Temporal Data in Relational DBMS
... provides a construct ROWS(nn) which provides a synopsis of the log entries for a given base table, and allows previous states of the table and associated transaction times to be retrieved using ordinary query language. But it might be as entirely legitimate to make a correction to one of the since o ...
... provides a construct ROWS(nn) which provides a synopsis of the log entries for a given base table, and allows previous states of the table and associated transaction times to be retrieved using ordinary query language. But it might be as entirely legitimate to make a correction to one of the since o ...
Helpful Hints on Developing a User-Friendly Database with SAS/AF
... or other reporting engines through the system. This allowed better control over what variables were delivered to users such as excluding unnecessary administrative variables. Another simple yet powerful option is the (genmax=11) option. Each time the data is updated or modified, a backup is created. ...
... or other reporting engines through the system. This allowed better control over what variables were delivered to users such as excluding unnecessary administrative variables. Another simple yet powerful option is the (genmax=11) option. Each time the data is updated or modified, a backup is created. ...
Conceptual Design Using the ER Model
... Database systems sometimes use “blocked I/O” because reading a block of continuous pages is more efficient that doing a separate I/O for each page. Assume that in our computer system, it is much more efficient to read and write blocks of 32 pages at a time, so all reads and writes from files must be ...
... Database systems sometimes use “blocked I/O” because reading a block of continuous pages is more efficient that doing a separate I/O for each page. Assume that in our computer system, it is much more efficient to read and write blocks of 32 pages at a time, so all reads and writes from files must be ...
Chapter 11
... Process that helps save storage space and increase processing efficiency – Reduces data redundancy ...
... Process that helps save storage space and increase processing efficiency – Reduces data redundancy ...
Data Integrity
... instituted within your organization to reduce the amount of time and effort required to implement effective views. The following rules will ensure that views are created in a responsible and useful manner at your shop. These rules were developed over a number of years as a result of implementing lar ...
... instituted within your organization to reduce the amount of time and effort required to implement effective views. The following rules will ensure that views are created in a responsible and useful manner at your shop. These rules were developed over a number of years as a result of implementing lar ...