Concurrency Control
... for leaf pages. For inserts, a node on a path from root to modified leaf must be locked (in X mode, of course), only if a split can propagate up to it from the modified leaf. (Similar point holds ...
... for leaf pages. For inserts, a node on a path from root to modified leaf must be locked (in X mode, of course), only if a split can propagate up to it from the modified leaf. (Similar point holds ...
What is a Transaction - a.thanop somprasong (ning)
... What concurrency control is and what role it plays in maintaining the database’s integrity What locking methods are and how they work How stamping methods are used for concurrency control How optimistic methods are used for concurrency control How database recovery management is used to ma ...
... What concurrency control is and what role it plays in maintaining the database’s integrity What locking methods are and how they work How stamping methods are used for concurrency control How optimistic methods are used for concurrency control How database recovery management is used to ma ...
Optimizing SQL
... What are other considerations why an index might not be used in Postgres? Problem: The planner has decided its faster to do a table scan than an index scan : This can happen if a) your table is relatively small, or the field you are indexing has a lot of duplicates. Solution: Case in point, boolean ...
... What are other considerations why an index might not be used in Postgres? Problem: The planner has decided its faster to do a table scan than an index scan : This can happen if a) your table is relatively small, or the field you are indexing has a lot of duplicates. Solution: Case in point, boolean ...
Slides
... At query time we do a TA-like merging of several ranked lists (i.e. sorted streams) The required number of sorted streams depends only on the number of specified attribute values in the query and not on the total number of attributes in the database Such a merge operation is only made possible due t ...
... At query time we do a TA-like merging of several ranked lists (i.e. sorted streams) The required number of sorted streams depends only on the number of specified attribute values in the query and not on the total number of attributes in the database Such a merge operation is only made possible due t ...
PatMan: A Visual Database System to Manipulate Path Patterns and
... well as the raw data that satisfy the query predicates. We next describe briefly each one of system modules. The PQBE module helps the user posing queries in PatManQL. The visual interface provided offers Pictorial-Query-by-Example capabilities, and, thus, minimizes user errors coming from queries tha ...
... well as the raw data that satisfy the query predicates. We next describe briefly each one of system modules. The PQBE module helps the user posing queries in PatManQL. The visual interface provided offers Pictorial-Query-by-Example capabilities, and, thus, minimizes user errors coming from queries tha ...
DBMS – SECURITY ISSUES
... forms, reports, and macros. Any user accounts that you add to the Admins group. In addition, you might want to add passwords to the accounts you create for users, or instruct users to add their own passwords. Users can create or change their own user account passwords; however, only an administrator ...
... forms, reports, and macros. Any user accounts that you add to the Admins group. In addition, you might want to add passwords to the accounts you create for users, or instruct users to add their own passwords. Users can create or change their own user account passwords; however, only an administrator ...
Research Journal of Recent Sciences _________________________________________________ Res. J. Recent Sci. 2(5),
... This paper is organized in four sections –the background of this research and existing work in the field of DBRE, next section explores the capabilities of each method studied, analysis and results section provides a comparative analysis of their capabilities and finally we conclude this research an ...
... This paper is organized in four sections –the background of this research and existing work in the field of DBRE, next section explores the capabilities of each method studied, analysis and results section provides a comparative analysis of their capabilities and finally we conclude this research an ...
Relational Data Model - Department Of Computer Science
... most important language in DBMS’s today. But SQL uses “bags” while the abstract relational model is set-oriented. Jeffrey Ullman ...
... most important language in DBMS’s today. But SQL uses “bags” while the abstract relational model is set-oriented. Jeffrey Ullman ...
dbTouch: Analytics at your Fingertips
... be performed. The system does not try to consume all data; instead, it analyzes only parts of the data at a time, continuously refining the answers and continuously reacting to user input. Every single user touch on a data object can be seen as a request to run an operator or a collection of operato ...
... be performed. The system does not try to consume all data; instead, it analyzes only parts of the data at a time, continuously refining the answers and continuously reacting to user input. Every single user touch on a data object can be seen as a request to run an operator or a collection of operato ...
The High Performance Sybase ASE DBA
... Added Complexity – While all of the above trends are adding tremendous complexity to a DBA’s daily work, Sybase and other database vendors have been responding with databases which are increasingly “self-managed” or “self-tuning” through the use of more dynamic access to system health information an ...
... Added Complexity – While all of the above trends are adding tremendous complexity to a DBA’s daily work, Sybase and other database vendors have been responding with databases which are increasingly “self-managed” or “self-tuning” through the use of more dynamic access to system health information an ...
Advanced Installation of NoiseTools
... Windows operating system. The version of the .NET Framework installed by depend upon the version of the Windows operating system that is installed. When NoiseTools was updated from v1.4.6 to v1.5, the .NET Framework used was changed from 3.5 to 4.0 to allow for new functions and features to be added ...
... Windows operating system. The version of the .NET Framework installed by depend upon the version of the Windows operating system that is installed. When NoiseTools was updated from v1.4.6 to v1.5, the .NET Framework used was changed from 3.5 to 4.0 to allow for new functions and features to be added ...
From Firebird 1.5 to 2.5
... • Firebird Classic 1.5 [actually] does not use more than 6 CPU cores ...
... • Firebird Classic 1.5 [actually] does not use more than 6 CPU cores ...
SUGI 27: Migrating a Publicly Available Web Database to a SAS(r
... and have relatively few combined number of measures, it was decided to combine them into a single MDDB. However, because missing values will be stored for the File B and File C measures that aren’t available for all of the years for which the File A measures are available, a combined MDDB requires m ...
... and have relatively few combined number of measures, it was decided to combine them into a single MDDB. However, because missing values will be stored for the File B and File C measures that aren’t available for all of the years for which the File A measures are available, a combined MDDB requires m ...
A Database Perspective on Knowledge Discovery
... relational databases. Thus, in our view, database mining is not simply another buzzword for statistical data analysis or inductive learning on large data sets. The key new component is the ad hoc nature of KDD queries and the need for efficient query compilation into a multitude of existing and new ...
... relational databases. Thus, in our view, database mining is not simply another buzzword for statistical data analysis or inductive learning on large data sets. The key new component is the ad hoc nature of KDD queries and the need for efficient query compilation into a multitude of existing and new ...
SQL/MySQL module - Social Security Online
... loop selection of D.dno which should be hashed for fast access since equality condition. May not be able to tell which condition is more restrictive, Salary or hobby. Use estimations, or better yet, database statistics after it’s been running for a while. If this query is very important, then maybe ...
... loop selection of D.dno which should be hashed for fast access since equality condition. May not be able to tell which condition is more restrictive, Salary or hobby. Use estimations, or better yet, database statistics after it’s been running for a while. If this query is very important, then maybe ...
Chapter 2-021112
... Thornthwaite recognizes that developing a data warehouse architecture is difficult, and thus warns against using a “just do it” approach, which he also calls “architecture lite.” But the Zachman framework is more than what most organizations need for data warehousing, so he recommends a reasonable c ...
... Thornthwaite recognizes that developing a data warehouse architecture is difficult, and thus warns against using a “just do it” approach, which he also calls “architecture lite.” But the Zachman framework is more than what most organizations need for data warehousing, so he recommends a reasonable c ...
Chapter 22: Distribute Databases
... At most K sites (participants as well as coordinator) can fail Phase 1: Obtaining Preliminary Decision: Identical to 2PC Phase 1. Every site is ready to commit if instructed to do so Phase 2 of 2PC is split into 2 phases, Phase 2 and Phase 3 of 3PC In phase 2 coordinator makes a decision as in ...
... At most K sites (participants as well as coordinator) can fail Phase 1: Obtaining Preliminary Decision: Identical to 2PC Phase 1. Every site is ready to commit if instructed to do so Phase 2 of 2PC is split into 2 phases, Phase 2 and Phase 3 of 3PC In phase 2 coordinator makes a decision as in ...
MOTE-View Users Manual
... 1. Surge_ Reliable and Surge_Reliable_Dot: Surge_ Reliable and Surge_Reliable_Dot are the standard applications that are preprogrammed into Motes shipped in a Crossbow MOTE-KIT. If MOTE-VIEW was installed into the default directly, then pre-compiled code can be found in C:\Program Files\ Crossbow\Mo ...
... 1. Surge_ Reliable and Surge_Reliable_Dot: Surge_ Reliable and Surge_Reliable_Dot are the standard applications that are preprogrammed into Motes shipped in a Crossbow MOTE-KIT. If MOTE-VIEW was installed into the default directly, then pre-compiled code can be found in C:\Program Files\ Crossbow\Mo ...
DT35682686
... A feasibility study is a high-level capsule version of the entire System analysis and Design Process. The study begins by classifying the problem definition. Feasibility is to determine if it’s worth doing. Once an acceptance problem definition has been generated, the analyst develops a logical mode ...
... A feasibility study is a high-level capsule version of the entire System analysis and Design Process. The study begins by classifying the problem definition. Feasibility is to determine if it’s worth doing. Once an acceptance problem definition has been generated, the analyst develops a logical mode ...
Oracle: Big Data for the Enterprise
... Oracle Big Data Appliance includes a combination of open source software and specialized software developed by Oracle to address enterprise big data requirements. Oracle NoSQL Database is a distributed, highly scalable, key-value database based on Oracle Berkeley DB. It delivers a general purpose, e ...
... Oracle Big Data Appliance includes a combination of open source software and specialized software developed by Oracle to address enterprise big data requirements. Oracle NoSQL Database is a distributed, highly scalable, key-value database based on Oracle Berkeley DB. It delivers a general purpose, e ...
PDF 496k - Journal of the Text Encoding Initiative
... Once the logical model is established, the next task was to implement the selected schema into a database management system, what is known as the “physical model.” (Silberschatz 2002: 40) As far as the selection of the system is concerned, native XML databases, such as eXist or BaseX, were discarded ...
... Once the logical model is established, the next task was to implement the selected schema into a database management system, what is known as the “physical model.” (Silberschatz 2002: 40) As far as the selection of the system is concerned, native XML databases, such as eXist or BaseX, were discarded ...
Supporting Join Queries
... If there are > 1 relevant producers, then our mediator probably needs an execution engine! - HARD! In any case, we know that some R-GMA users are defining Archivers and querying these directly. However: ...
... If there are > 1 relevant producers, then our mediator probably needs an execution engine! - HARD! In any case, we know that some R-GMA users are defining Archivers and querying these directly. However: ...
Introducing Databases - Department of Computer and Information
... database. • Represents a characteristic of the subject of the table to which it belongs. • The quality of information retrieved from the database depends heavily on the time invested in ensuring the structural and data integrity of fields (more on that later …). • A field should contain 1 and only 1 ...
... database. • Represents a characteristic of the subject of the table to which it belongs. • The quality of information retrieved from the database depends heavily on the time invested in ensuring the structural and data integrity of fields (more on that later …). • A field should contain 1 and only 1 ...
5 Networks and Collaboration As Business Solutions Information
... environment because new applications are added to the system. As the number of applications increases, so does the number of people who can access data • Lack of data integrity – In the file environment it is harder to enforce data integrity rules (ความถูกต้องของข้อมูล), which include preventing dat ...
... environment because new applications are added to the system. As the number of applications increases, so does the number of people who can access data • Lack of data integrity – In the file environment it is harder to enforce data integrity rules (ความถูกต้องของข้อมูล), which include preventing dat ...
1 - FAU College of Engineering
... • A database is an integrated collection of data. A database management system (DBMS) provides mechanisms for storing, organizing, retrieving and modifying data. • Today’s most popular database management systems are relational database systems. • SQL is the international standard language used almo ...
... • A database is an integrated collection of data. A database management system (DBMS) provides mechanisms for storing, organizing, retrieving and modifying data. • Today’s most popular database management systems are relational database systems. • SQL is the international standard language used almo ...