original - Kansas State University
... 2. Validation phase: Transaction Ti performs a ``validation test'' to determine if local variables can be written without violating serializability. 3. Write phase: If Ti is validated, the updates are applied to the database; otherwise, Ti is rolled back. The three phases of concurrently executing ...
... 2. Validation phase: Transaction Ti performs a ``validation test'' to determine if local variables can be written without violating serializability. 3. Write phase: If Ti is validated, the updates are applied to the database; otherwise, Ti is rolled back. The three phases of concurrently executing ...
Introduction to Database Systems
... Idea: If an action of Ti (say, writing X) affects Tj (which perhaps reads X), one of them, say Ti, will obtain the lock on X first and Tj is forced to wait until Ti completes; this effectively orders the transactions. What if Tj already has a lock on Y and Ti later requests a lock on Y? What is it c ...
... Idea: If an action of Ti (say, writing X) affects Tj (which perhaps reads X), one of them, say Ti, will obtain the lock on X first and Tj is forced to wait until Ti completes; this effectively orders the transactions. What if Tj already has a lock on Y and Ti later requests a lock on Y? What is it c ...
Client Server Architecture
... The same database record is updated at different sites, servers after each other. Updated records that are released to another server must first be removed or "flushed" from memory, as it is not ensured that this value in memory remains the actual value in the database due to the other server. When ...
... The same database record is updated at different sites, servers after each other. Updated records that are released to another server must first be removed or "flushed" from memory, as it is not ensured that this value in memory remains the actual value in the database due to the other server. When ...
Hour53
... • Database (Relational database) • A database is a collection of one or more (usually related) tables that has been created with database-management software. • Microsoft Access is one of the best known database-management products. • Some other prominent ones are that Oracle, SQL server, and DB2. ...
... • Database (Relational database) • A database is a collection of one or more (usually related) tables that has been created with database-management software. • Microsoft Access is one of the best known database-management products. • Some other prominent ones are that Oracle, SQL server, and DB2. ...
File
... one transaction's failure causes many to fail. Write down the SQL facilities for recovery. [Nov/Dec 2012] SQL server is designed to recover from system and media failure and recovery system can scale to machines with very large buffer pools and thousand of disk drives. Describe a circumstance in whi ...
... one transaction's failure causes many to fail. Write down the SQL facilities for recovery. [Nov/Dec 2012] SQL server is designed to recover from system and media failure and recovery system can scale to machines with very large buffer pools and thousand of disk drives. Describe a circumstance in whi ...
Introduction - University of Virginia, Department of Computer Science
... Idea: If an action of Ti (say, writing X) affects Tj (which perhaps reads X), one of them, say Ti, will obtain the lock on X first and Tj is forced to wait until Ti completes; this effectively orders the transactions. What if Tj already has a lock on Y and Ti later requests a lock on Y? What is it c ...
... Idea: If an action of Ti (say, writing X) affects Tj (which perhaps reads X), one of them, say Ti, will obtain the lock on X first and Tj is forced to wait until Ti completes; this effectively orders the transactions. What if Tj already has a lock on Y and Ti later requests a lock on Y? What is it c ...
Databases course of 2017-03-02
... (DBAs) and other specialists. allows different user application programs to easily access the same database ...
... (DBAs) and other specialists. allows different user application programs to easily access the same database ...
PENGANTAR MANAJEMEN BASIS DATA
... • Concurrent transactions refer to two or more transactions that appear to users as they are being processed against a database at the same time • In reality, CPU can execute only one instruction at a time – Transactions are interleaved meaning that the operating system quickly switches CPU servi ...
... • Concurrent transactions refer to two or more transactions that appear to users as they are being processed against a database at the same time • In reality, CPU can execute only one instruction at a time – Transactions are interleaved meaning that the operating system quickly switches CPU servi ...
pdf
... A “serial” execution is one in which there is at most one transaction running at a time, and it always completes via commit or abort before another starts “Serializability” is the “illusion” of a serial execution Transactions execute concurrently and their operations interleave at the level of the d ...
... A “serial” execution is one in which there is at most one transaction running at a time, and it always completes via commit or abort before another starts “Serializability” is the “illusion” of a serial execution Transactions execute concurrently and their operations interleave at the level of the d ...
30_Goel_Spanner
... Need for consistent data across the globe. Read and write without being crushed by huge latencies. Having data located as per the Clients need. Evolution Spanner has evolved from a Bigtable-like versioned key-value store into a temporal multi-version database. Spanner is the successor to Google's Me ...
... Need for consistent data across the globe. Read and write without being crushed by huge latencies. Having data located as per the Clients need. Evolution Spanner has evolved from a Bigtable-like versioned key-value store into a temporal multi-version database. Spanner is the successor to Google's Me ...
MCS21416 - File Storage
... – times during the day/week when there will be a high demand made on the database (called the peak load). ...
... – times during the day/week when there will be a high demand made on the database (called the peak load). ...
ch15
... The lock manager maintains a data-structure called a lock table to record granted locks and pending requests The lock table is usually implemented as an in-memory hash table indexed on the name of the data item being locked ...
... The lock manager maintains a data-structure called a lock table to record granted locks and pending requests The lock table is usually implemented as an in-memory hash table indexed on the name of the data item being locked ...
dsmDB: A Distributed Shared Memory Approach for Building
... to the dsmDB: First, it allows applications to tune the level of global consistency needed through the Consistency Manager. Second, weak consistency can be efficiently implemented by the Storage Manager. We now briefly describe one possible implementation of the Distributed Storage Manager. The virt ...
... to the dsmDB: First, it allows applications to tune the level of global consistency needed through the Consistency Manager. Second, weak consistency can be efficiently implemented by the Storage Manager. We now briefly describe one possible implementation of the Distributed Storage Manager. The virt ...
Audit Logger for ACCPAC is an intelligent module that operates
... Administrators can easily define which optional fields require auditing for each view. Audit Logger operates seamlessly within the Sage 300 ERP environment; many of the product features are simply not achievable with external database level auditing products. ...
... Administrators can easily define which optional fields require auditing for each view. Audit Logger operates seamlessly within the Sage 300 ERP environment; many of the product features are simply not achievable with external database level auditing products. ...
eXtremeDB™ Fusion
... Developers can specify the maximum database size, which is especially important when the „disk‟ is actually a flash memory file system Database cache can be saved and re-used across sessions – for example, so a user can resume some activity when a device is switched back on The database can ex ...
... Developers can specify the maximum database size, which is especially important when the „disk‟ is actually a flash memory file system Database cache can be saved and re-used across sessions – for example, so a user can resume some activity when a device is switched back on The database can ex ...
View Presentation Online - Mark Gurry & Associates
... Data is pulled from source to the target using the PL/SQL stored procedures ...
... Data is pulled from source to the target using the PL/SQL stored procedures ...
Chapter 1
... Used to format and present the data in a professional, logical and useful manner. Often intended for printing and distribution. Can be built from tables or queries. Reports (output) in a system dictate what data must be stored in the database. Report, Layout and Design view and Print Preview ...
... Used to format and present the data in a professional, logical and useful manner. Often intended for printing and distribution. Can be built from tables or queries. Reports (output) in a system dictate what data must be stored in the database. Report, Layout and Design view and Print Preview ...
CIS 338: Using Data Access Objects
... ws[name].BeginTrans 'ws = workspace object RollBack – removes all changes since BeginTrans CommitTrans – permanently saves (can't be rolled back afterwards) ...
... ws[name].BeginTrans 'ws = workspace object RollBack – removes all changes since BeginTrans CommitTrans – permanently saves (can't be rolled back afterwards) ...
Database Management System
... Concurrent execution of user programs is essential for good DBMS performance. – Because disk accesses are frequent, and relatively slow, it is important to keep the cpu humming by working on several user programs concurrently. Interleaving actions of different user programs can lead to inconsistency ...
... Concurrent execution of user programs is essential for good DBMS performance. – Because disk accesses are frequent, and relatively slow, it is important to keep the cpu humming by working on several user programs concurrently. Interleaving actions of different user programs can lead to inconsistency ...
Database (1)
... 1. Course title and code: Database (1) CIS-125-Z 2. Credit hours 4 4. Name of faculty member responsible for the course ...
... 1. Course title and code: Database (1) CIS-125-Z 2. Credit hours 4 4. Name of faculty member responsible for the course ...
التاريخ: 16/9/2007 - Philadelphia University Jordan
... from different sources linking these together with a few words or sentences of your own and changing a few words from the original text: this is regarded as over-dependence on other sources, which is a form of plagiarism. 3. Direct quotations from an earlier piece of your own work, if not attributed ...
... from different sources linking these together with a few words or sentences of your own and changing a few words from the original text: this is regarded as over-dependence on other sources, which is a form of plagiarism. 3. Direct quotations from an earlier piece of your own work, if not attributed ...
15. Concurrency Control
... this, follow a modified protocol called strict two-phase locking. Here a transaction must hold all its exclusive locks till it commits/aborts. Rigorous two-phase locking is even stricter: here all locks are held ...
... this, follow a modified protocol called strict two-phase locking. Here a transaction must hold all its exclusive locks till it commits/aborts. Rigorous two-phase locking is even stricter: here all locks are held ...
Concurrency_Control_Techniques
... Ti starts its write phase after Tj completes its write phase, and the read_set of Ti has no items in common with the write_set of Tj Both the read_set and write_set of Ti have no items in common with the write_set of Tj, and Tj completes its read phase. When validating Ti, the first condition is che ...
... Ti starts its write phase after Tj completes its write phase, and the read_set of Ti has no items in common with the write_set of Tj Both the read_set and write_set of Ti have no items in common with the write_set of Tj, and Tj completes its read phase. When validating Ti, the first condition is che ...
Blotter: Low Latency Transactions for Geo
... (T 0 ≺ T 2), then the protocol must prevent T 1 from either reading or overwriting the values written by T 2. Otherwise, we would have T 0 ≺ T 2 ≺ T 1, and T 1 should have read the value for object x written by T 2 (i.e., xi+1 ) instead of that written by T 0 (i.e., xi ). Next, we detail how this is ...
... (T 0 ≺ T 2), then the protocol must prevent T 1 from either reading or overwriting the values written by T 2. Otherwise, we would have T 0 ≺ T 2 ≺ T 1, and T 1 should have read the value for object x written by T 2 (i.e., xi+1 ) instead of that written by T 0 (i.e., xi ). Next, we detail how this is ...