T - VUB STAR lab
... Each transaction is issued a timestamp when it enters the system. If an older transaction Ti has time-stamp TS(Ti), a new transaction Tj is assigned a later time-stamp TS(Tj) > TS(Ti). The protocol manages concurrent execution such that the timestamps determine the serializability order. There a ...
... Each transaction is issued a timestamp when it enters the system. If an older transaction Ti has time-stamp TS(Ti), a new transaction Tj is assigned a later time-stamp TS(Tj) > TS(Ti). The protocol manages concurrent execution such that the timestamps determine the serializability order. There a ...
Chapter 4
... – LGWR writes concurrently to redo log files in a group • It never writes to two redo log groups at a time • If one or more redo log files are damaged within a redo log group, it writes to the remaining file(s) • If all files in group are damaged, it stops DB operations until a successful log switch ...
... – LGWR writes concurrently to redo log files in a group • It never writes to two redo log groups at a time • If one or more redo log files are damaged within a redo log group, it writes to the remaining file(s) • If all files in group are damaged, it stops DB operations until a successful log switch ...
Part II, Multiple Choice Questions
... C )Allocates access time to the database to make sure it is fair D )Forces transactions to run separately so that result consistency is maintained 36 .If indexes speed data retrieval, then why don't we index all fields in a database? A )It would take a lot of disk space B )The overhead of maintainin ...
... C )Allocates access time to the database to make sure it is fair D )Forces transactions to run separately so that result consistency is maintained 36 .If indexes speed data retrieval, then why don't we index all fields in a database? A )It would take a lot of disk space B )The overhead of maintainin ...
s of Querying a Database
... • Work best on multiple CPU platforms in tandem with partitioning, and with multiple disks or RAID arrays • SQL queries and coding that can be executed in parallel are limited to the following functionality: – Queries containing at least one table scan using SELECT/INSERT/UPDATE/DELETE statements – ...
... • Work best on multiple CPU platforms in tandem with partitioning, and with multiple disks or RAID arrays • SQL queries and coding that can be executed in parallel are limited to the following functionality: – Queries containing at least one table scan using SELECT/INSERT/UPDATE/DELETE statements – ...
Chapter 5: Other Relational Languages
... average account balance is more than $1,200, we simply add the condition box: ...
... average account balance is more than $1,200, we simply add the condition box: ...
echo ""
... To create a table, use the CREATE TABLE statement with the mysqli_query() function Execute the mysqli_select_db() function before executing the CREATE TABLE statement or the new table might be created in the wrong database To prevent code from attempting to create a table that already exists, use a ...
... To create a table, use the CREATE TABLE statement with the mysqli_query() function Execute the mysqli_select_db() function before executing the CREATE TABLE statement or the new table might be created in the wrong database To prevent code from attempting to create a table that already exists, use a ...
The Relational Model
... restricted to things that can be represented by a single table. KROENKE and AUER - DATABASE CONCEPTS (6th Edition) Copyright © 2013 Pearson Educations, Inc. Publishing as Prentice Hall ...
... restricted to things that can be represented by a single table. KROENKE and AUER - DATABASE CONCEPTS (6th Edition) Copyright © 2013 Pearson Educations, Inc. Publishing as Prentice Hall ...
MS SQL Server 7.5 / DBA / Data Warehousing
... November 1999 – January 2000 Oracle DBA / Oracle Parallel Server / Oracle Web Server / Sybase System 11.9 / Data Modeling /Web-Based App. Database Primary responsibilities consisted of database design for a Sybase database that would be fed from an internet/web based application. This Sybase databas ...
... November 1999 – January 2000 Oracle DBA / Oracle Parallel Server / Oracle Web Server / Sybase System 11.9 / Data Modeling /Web-Based App. Database Primary responsibilities consisted of database design for a Sybase database that would be fed from an internet/web based application. This Sybase databas ...
Relational-Complete Private Information Retrieval
... as querying a patent database without eavesdroppers discovering the (private) nature of your work, or privately searching messages from a public host, without anyone associating your identity to your message box by the content of the query. We consider a motivating example that highly relevant to to ...
... as querying a patent database without eavesdroppers discovering the (private) nature of your work, or privately searching messages from a public host, without anyone associating your identity to your message box by the content of the query. We consider a motivating example that highly relevant to to ...
Chapter5. Other Relational Languages
... average account balance is more than $1,200, we simply add the condition box: ...
... average account balance is more than $1,200, we simply add the condition box: ...
Planned/Unplanned downtime & Runtime Load balancing
... planned and unplanned downtimes. It is mandatory to have this property turned on. For more details on how to form ONSConfiguration string, refer to the Oracle Notification Service (ONS) section of the white paper “Java Programming with Oracle Database 12c RAC and Active Data Guard 3” Select the data ...
... planned and unplanned downtimes. It is mandatory to have this property turned on. For more details on how to form ONSConfiguration string, refer to the Oracle Notification Service (ONS) section of the white paper “Java Programming with Oracle Database 12c RAC and Active Data Guard 3” Select the data ...
Plug Into The Cloud c
... storage costs down. Oracle offers a number of database technologies that can help customers ensure fast performance while keeping down the cost of storing and managing data throughout its lifecycle. These include: » Oracle Automatic Storage Management to automate the striping and mirroring of databa ...
... storage costs down. Oracle offers a number of database technologies that can help customers ensure fast performance while keeping down the cost of storing and managing data throughout its lifecycle. These include: » Oracle Automatic Storage Management to automate the striping and mirroring of databa ...
The Relational Model - Department of Computer Science | UNC
... A set of fields is a key for a relation if : 1. No two distinct tuples can have same values in all key fields, and 2. This is not true for any subset of the key. – Part 2 false? A superkey. – If there’s >1 key for a relation, one of the keys is chosen (by DBA) to be the primary key. ...
... A set of fields is a key for a relation if : 1. No two distinct tuples can have same values in all key fields, and 2. This is not true for any subset of the key. – Part 2 false? A superkey. – If there’s >1 key for a relation, one of the keys is chosen (by DBA) to be the primary key. ...
Self-Tuning Database Systems: A Decade of Progress
... The next contribution was the key decision of defining the search space as consisting of the best configuration(s) for each query in the workload, where the best configuration itself is the one with lowest optimizer estimated cost for the query. Intuitively, this leverages the idea (see also [41]) t ...
... The next contribution was the key decision of defining the search space as consisting of the best configuration(s) for each query in the workload, where the best configuration itself is the one with lowest optimizer estimated cost for the query. Intuitively, this leverages the idea (see also [41]) t ...
branch-name
... average account balance is greater than $1200. select branch-name, avg-balance from (select branch-name, avg (balance) from account group by branch-name) as result (branch-name, avg-balance) where avg-balance > 1200 Note that we do not need to use the having clause, since we compute the temporary (v ...
... average account balance is greater than $1200. select branch-name, avg-balance from (select branch-name, avg (balance) from account group by branch-name) as result (branch-name, avg-balance) where avg-balance > 1200 Note that we do not need to use the having clause, since we compute the temporary (v ...
CS 46B: Introduction to Data Structures
... Databases Illuminated, 3rd ed. by Ricardo & Urban Jones & Bartlett Learning, 2017 ISBN 978-1-284-05694-5 ...
... Databases Illuminated, 3rd ed. by Ricardo & Urban Jones & Bartlett Learning, 2017 ISBN 978-1-284-05694-5 ...
Lesson 1: Exploring the Access Environment
... Additionally, and perhaps most importantly, each record in a database table must be unique. The customers table may store information about multiple customers, but each customer is entered only once in the table. Because the data stored in each table is related to data in the other tables of the dat ...
... Additionally, and perhaps most importantly, each record in a database table must be unique. The customers table may store information about multiple customers, but each customer is entered only once in the table. Because the data stored in each table is related to data in the other tables of the dat ...
WLCG2008CERN
... FTS Developer View on Database Plans • We pretty much leave it to the DBA really… • In terms of plans, we have the ongoing plan to move more monitoring into the database – which means more summary and raw data stored. We’ll also do the analytic summarization in PL/SQL, so you should expect and incr ...
... FTS Developer View on Database Plans • We pretty much leave it to the DBA really… • In terms of plans, we have the ongoing plan to move more monitoring into the database – which means more summary and raw data stored. We’ll also do the analytic summarization in PL/SQL, so you should expect and incr ...
Document
... any lock on the item. If a lock cannot be granted, the requesting transaction is made to wait till ...
... any lock on the item. If a lock cannot be granted, the requesting transaction is made to wait till ...
EFFICIENCY ISN’T ENOUGH: DATA CENTERS LEAD THE DRIVE TO INNOVATION
... For some enterprises, the opposite effect may be true. “Our problem may be reversed from most,” notes one respondent. “We are not given even the minimum amount of time needed for database and systems management, because we keep having new projects thrown at us and management does not understand the ...
... For some enterprises, the opposite effect may be true. “Our problem may be reversed from most,” notes one respondent. “We are not given even the minimum amount of time needed for database and systems management, because we keep having new projects thrown at us and management does not understand the ...
Day 3 AND Day 4 Topics Privileges Enhancements Implementing
... Grants of Administrative Privileges to Users The administrative privileges must be provided to trusted users only. The users who have their names in non-ASCII characters cannot be supported using the granted privilege when the oracle database is shut down but if the database instance is up, then ...
... Grants of Administrative Privileges to Users The administrative privileges must be provided to trusted users only. The users who have their names in non-ASCII characters cannot be supported using the granted privilege when the oracle database is shut down but if the database instance is up, then ...
ppt - Fordham University Computer and Information Sciences
... old-name as new-name Find the name, loan number and loan amount of all customers; rename the ...
... old-name as new-name Find the name, loan number and loan amount of all customers; rename the ...