Lecture 28
... new one. – Rollback work causes current transaction to abort. • In almost all database systems, by default, every SQL statement also commits implicitly if it executes successfully – Implicit commit can be turned off by a database directive • E.g. in JDBC, connection.setAutoCommit(false); ...
... new one. – Rollback work causes current transaction to abort. • In almost all database systems, by default, every SQL statement also commits implicitly if it executes successfully – Implicit commit can be turned off by a database directive • E.g. in JDBC, connection.setAutoCommit(false); ...
Query Optimization
... Optimizing Nested Subqueries (Cont.) • In our example, the original nested query would be transformed to create table t1 as select distinct customer-name from depositor select customer-name from borrower, t1 where t1.customer-name = borrower.customer-name • The process of replacing a nested query b ...
... Optimizing Nested Subqueries (Cont.) • In our example, the original nested query would be transformed to create table t1 as select distinct customer-name from depositor select customer-name from borrower, t1 where t1.customer-name = borrower.customer-name • The process of replacing a nested query b ...
Retrieving Data Using the SQL SELECT Statement
... Unless you indicate otherwise, iSQL*Plus displays the results of a query without eliminating duplicate rows. The first example in the slide displays all the department numbers from the EMPLOYEES table. Notice that the department numbers are repeated. To eliminate duplicate rows in the result, includ ...
... Unless you indicate otherwise, iSQL*Plus displays the results of a query without eliminating duplicate rows. The first example in the slide displays all the department numbers from the EMPLOYEES table. Notice that the department numbers are repeated. To eliminate duplicate rows in the result, includ ...
Module 3 Basic Access
... Adding Records to a Table Type 21876 as the Amount Paid amount and then press the TAB key Type 892.50 as the current due amount and then press the TAB key Type 42 as the trainer number to complete data entry for the record Press the TAB key Use the techniques shown in the previous four st ...
... Adding Records to a Table Type 21876 as the Amount Paid amount and then press the TAB key Type 892.50 as the current due amount and then press the TAB key Type 42 as the trainer number to complete data entry for the record Press the TAB key Use the techniques shown in the previous four st ...
EGEE NA4 Meeting - Catania, 09
... USE CASE TIMELINE: To submit the JDL file from the GENIUS portal and monitoring its status. In the meantime, from RGMA Browser, monitoring the table and if there is any producers that are publishing tuples. If there is one, to send a query with a predicate to obtain the answer tuples. INFSO-RI-50883 ...
... USE CASE TIMELINE: To submit the JDL file from the GENIUS portal and monitoring its status. In the meantime, from RGMA Browser, monitoring the table and if there is any producers that are publishing tuples. If there is one, to send a query with a predicate to obtain the answer tuples. INFSO-RI-50883 ...
Enterprise PDM - Backup and Restore
... requires the most administration because all operations are logged and the transaction log is not truncated until a transaction log backup is performed. Be careful not to run out the disk space. Databases are usually set to Full recovery mode by default. If the database is left in Full recovery mode ...
... requires the most administration because all operations are logged and the transaction log is not truncated until a transaction log backup is performed. Be careful not to run out the disk space. Databases are usually set to Full recovery mode by default. If the database is left in Full recovery mode ...
Transactions
... Other Notions of Serializability The schedule below produces same outcome as the serial ...
... Other Notions of Serializability The schedule below produces same outcome as the serial ...
Immutability Changes Everything
... In some ways, the ability to work across immutable DataSets and relational databases is surprising. Immutable DataSets are defined with an identity and an optional version. Their schema is the schema that describes the shape and form of the DataSet at the time of its creation. It has descriptive sch ...
... In some ways, the ability to work across immutable DataSets and relational databases is surprising. Immutable DataSets are defined with an identity and an optional version. Their schema is the schema that describes the shape and form of the DataSet at the time of its creation. It has descriptive sch ...
15. Concurrency Control
... A node Q can be locked by Ti in S or IS mode only if the parent of Q is currently locked by Ti in either IX or IS mode. A node Q can be locked by Ti in X, SIX, or IX mode only if the parent of Q is currently locked by Ti in either IX or SIX mode. Ti can lock a node only if it has not previously unlo ...
... A node Q can be locked by Ti in S or IS mode only if the parent of Q is currently locked by Ti in either IX or IS mode. A node Q can be locked by Ti in X, SIX, or IX mode only if the parent of Q is currently locked by Ti in either IX or SIX mode. Ti can lock a node only if it has not previously unlo ...
SOFTWARE FOR BIOLOGICAL DATA STORAGE AND SEQUENCE
... For storage of the project data set a database was developed that stores information about productivity and genotypes of animals. For each animal species (pigs and cows) a separate database, was created because the range of the controlled traits is different. For implementation of the database Postg ...
... For storage of the project data set a database was developed that stores information about productivity and genotypes of animals. For each animal species (pigs and cows) a separate database, was created because the range of the controlled traits is different. For implementation of the database Postg ...
EMC XTREMIO HIGH-PERFORMANCE CONSOLIDATION SOLUTION FOR ORACLE
... via consolidation, both online transaction processing (OLTP) and online analytical processing (OLAP) workloads share the same servers and storage. Therefore, for optimal performance, the underlying storage infrastructure must also be designed to handle the different workloads in a consolidated infra ...
... via consolidation, both online transaction processing (OLTP) and online analytical processing (OLAP) workloads share the same servers and storage. Therefore, for optimal performance, the underlying storage infrastructure must also be designed to handle the different workloads in a consolidated infra ...
Basic Concepts of Relational Database
... same as a primary key of another table. Keys can be simple (a single field) or composite (more than one field) Keys usually are used as indexes to speed up the response to user queries. ...
... same as a primary key of another table. Keys can be simple (a single field) or composite (more than one field) Keys usually are used as indexes to speed up the response to user queries. ...
XML - Cern
... • Messages can be transformed from one type to another – Object to XML, XML to Object, XML to XML Users define attributes in the destination message as expressions involving attributes in the source message – e.g., Subscription based on existNode() ...
... • Messages can be transformed from one type to another – Object to XML, XML to Object, XML to XML Users define attributes in the destination message as expressions involving attributes in the source message – e.g., Subscription based on existNode() ...
Transaction Management
... The objective of concurrency control is to maximise transaction throughput while preventing interference among multiple users. Transaction throughput is the number of transactions processed per unit of time, is a measure of the amount of work performed by the DBMS. More than one million transactions ...
... The objective of concurrency control is to maximise transaction throughput while preventing interference among multiple users. Transaction throughput is the number of transactions processed per unit of time, is a measure of the amount of work performed by the DBMS. More than one million transactions ...
The Process of Tuning DB2 for AIX
... db2_status.ksh -d --> this script waits for the sampling time and then gathers
all the DB2 snapshot information into the IBM snapshot tables. The script provides the
following data for reviw:
...
... db2_status.ksh -d
EPICS_IOC_database
... Get data from other records or from hardware Perform calculations Check that values are in range and raise alarms Put data to other records or to hardware Activate or disable other records Wait for hardware signals (interrupts) What a record does depends upon The record type Each re ...
... Get data from other records or from hardware Perform calculations Check that values are in range and raise alarms Put data to other records or to hardware Activate or disable other records Wait for hardware signals (interrupts) What a record does depends upon The record type Each re ...
PL/SQL Programming Chapter 8 Database
... schema in which the trigger event originated • ON SCHEMA – only fires when event occurs in the same schema in which the trigger was created ...
... schema in which the trigger event originated • ON SCHEMA – only fires when event occurs in the same schema in which the trigger was created ...
SQL Concepts vs. SQL Code: Improving Programs using the 8 SQL
... the SQL concepts are frequently implementable in SQL. Let us briefly review how the major five concepts are implemented. PROJECTION: If you don’t want some columns in excel you click, drag and delete. True this is manual, but it is still an implementation of an SQL concept. If your database is small ...
... the SQL concepts are frequently implementable in SQL. Let us briefly review how the major five concepts are implemented. PROJECTION: If you don’t want some columns in excel you click, drag and delete. True this is manual, but it is still an implementation of an SQL concept. If your database is small ...
Application Server Performance – A Technical White Paper
... implement, called ejbLoad and ejbStore. These methods are called by the container when a bean instance needs to be refreshed depending on the current transactional state. The EJB technology assumes that only a single thread can ever be running within a bean instance. To boost performance it is neces ...
... implement, called ejbLoad and ejbStore. These methods are called by the container when a bean instance needs to be refreshed depending on the current transactional state. The EJB technology assumes that only a single thread can ever be running within a bean instance. To boost performance it is neces ...