* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Flashback Transaction Query
Survey
Document related concepts
Microsoft Access wikipedia , lookup
Commitment ordering wikipedia , lookup
Microsoft SQL Server wikipedia , lookup
Open Database Connectivity wikipedia , lookup
Entity–attribute–value model wikipedia , lookup
Functional Database Model wikipedia , lookup
Ingres (database) wikipedia , lookup
Serializability wikipedia , lookup
Extensible Storage Engine wikipedia , lookup
Microsoft Jet Database Engine wikipedia , lookup
Relational model wikipedia , lookup
Oracle Database wikipedia , lookup
Clusterpoint wikipedia , lookup
Versant Object Database wikipedia , lookup
ContactPoint wikipedia , lookup
Transcript
Session id: 40109 Oracle Database 10g Time Navigation: Human-Error Correction Tammy Bednar Sr. Product Manager Oracle Corporation Magnus Lubeck DBA/Systems Analyst CERN, IT-DB Group Time Navigation and Human Error CorrectionCorrection Correction noitcerroC Human Error Estimated to be the biggest single cause of downtime Need to quickly determine what happened and fix it – – Localized damage Needs surgical detection and repair Example – removed wrong person named ‘Smith’ Widespread damage Requires drastic action to avoid long downtime Example – batch job deletes this month’s orders Human Errors Other Downtime Analysis and correction using traditional recovery is slow and complex – Restore database to point in time and extract data Oracle Database 10g is a breakthrough release for human error correction Flashback Time Navigation Flashback Query – Query all data at point in time Select * from Emp AS OF ‘2:00 P.M.’ where … Tx 3 Flashback Versions Query – See all versions of a row between two times – See transactions that changed the row Select * from Emp VERSIONS BETWEEN ‘2:00 PM’ and ‘3:00 PM’ where … Tx 2 Tx 1 Flashback Transaction Query – See all changes made by a transaction Select * from DBA_TRANSACTION_QUERY where xid = ‘000200030000002D’; Flashback Error Correction Database Customer Recovery at all levels Database Level – Flashback Database restores the whole database to time Uses Flashback Logs Table Level – Order – Flashback Table restores rows in a set of tables to time Uses UNDO in database Flashback Drop restores a dropped table or a index Recycle bin for DROPs Row Level – Flashback Query restores rows to time Flashback Database A new strategy for point in time recovery Disk Write New Block Version Data Files Old Block Version Flashback Log Eliminate the need to restore a whole database backup Integrated seamlessly with RMAN – Think of it as a continuous backup – Restores just changed blocks Replay log to restore DB to time It’s fast - recover in minutes, not hours It’s easy - single command restore Flashback Database to ‘2:05 PM’ – “Rewind” button for the Database Flashback Drop Emp Drop table emp; Recycle bin Flashback Table emp before drop; Mistake was made Emp Quickly recover dropped objects Provides self-service recovery Eliminate the need for TSPITR Virtual Recycle Bin – Objects remain in the recycle bin until you permanently drop them with the PURGE command or recover them with the Flashback Table command. – Objects will remain in the recycle bin until there is no room in the tablespace for new rows or updates to existing rows or until the tablespace needs to be extended – Objects are purged in the order they were dropped. Flashback Table Recover a table or tables to a specific point in time without restoring a backup Provides a way for users to easily and quickly recover from accidental modifications without DBA involvement In-place and online recovery of a table to a point in time in the past Eliminate traditional restores and clone instances to recover a table or tables to a specific point in time Data in the tables and all associated objects (indexes, constraints, triggers, etc.) are restored Flashback Versions Query Provides a way to audit the rows of a table and retrieve information about the transactions that changed the rows. Retrieve all committed versions of the rows that exist or ever existed between the time the query was issued and a point in time in the past Use the transaction ID to perform transaction mining using LogMiner or Flashback Transaction Query to obtain additional information about the transaction. Flashback Transaction Query Provides a way for you to view changes made to the database at the transaction level When used in conjunction with Flashback Versions Query, it allows you to easily recover from user or application errors. Benefits – – – Increase online diagnosability of problems in your database Perform analysis and audits of transactions Fast recovery at the transaction level Database Mission Determine what transaction removed Order ID 2453 Recover the corruption fast! Order ID 2453 & line item data The Order ID data is removed from the database Using the ‘VERSIONS BETWEEN’ syntax, you can find the operations and transactions executed for Order 2453 After manually executing the SQL statements, Order 2453 & its line items have been inserted back into the database! Flashback Transaction Query Provides the SQL statements to ‘undo’ the offending operation CERN Magnus Lubeck, DBA/Systems analyst CERN is the world biggest particle physics research center. In operation for 50 years! In our physics research we collect enormous amounts of data, of which some is stored in ORDBMS Oracle 10G beta testing and evaluation is an important activity for CERN to support the physics community by understanding and request new features. 10 people in our Oracle beta test team, focusing on different areas 6 miles Testbed setup General purpose for – – RAC testing Oracle 10G testing The setup – – – – Five dual CPU servers (four connected to SAN) Gbit interconnect Plenty of disk A set up workstations to run applications Not a setup for Benchmarks, but for proof of concept SAN Testing Flashback Features The Flashback features is a subset of the beta testing performed at CERN The Human Error Correction testing, in order of appearance – the one hour approach – – – – – Install Sofware + DB instance Setting up the recovery area Flashback table Flashback transaction query Flashback database CERN – Testing FB features Preparations Testing Summary of CERN Flashback testing Flashback Table/Drop – – Easy to get back dropped tables Nice to be able to query dropped tables Flashback Transaction Query – – Diagnosability Accountability Flashback database – Fast recovery Flash Recovery Area – Organizes & manages backups Future use of FB features Revolution in Recovery Flashback Revolutionizes Recovery – – Operates on just the changed data Time to correct error equals time to make error Minutes instead of hours Correction Time = Error Time + f(DB_SIZE) Flashback is Easy – Single command instead of complex procedure Flashback for All Users END USER • Flashback Query • Flashback Versions Query DEVELOPER • Flashback Versions Query • Flashback Transaction Query • Flashback Table DATABASE ADMIN • Flashback Database • Flashback Drop SYSTEM ADMIN • Data Guard Next Steps High Availability Sessions from Oracle Tuesday in Moscone Room 304 Wednesday in Moscone Room 304 11:00 AM 8:30 AM How Oracle Database 10G Revolutionizes Availability and Enables the Grid Oracle Database 10G - RMAN and ATA Storage in Action 11:00 AM 3:30 PM Oracle Recovery Manager (RMAN) 10G: Reloaded Oracle Data Guard: Maximum Data Protection at Minimum Cost 1:00 PM 5:00 PM Proven Techniques for Maximizing Availability Oracle Database 10G Time Navigation: Human-Error Correction 4:30 PM Data Guard SQL Apply: Back to the Future For More Info On Oracle HA Go To http://otn.oracle.com/deploy/availability/ Next Steps High Availability Sessions from Oracle Thursday Database HA Demos All Four Days In The Oracle Demo Campground 8:30 AM -- Moscone Room 304 Oracle Database 10G Data Warehouse Backup and Recovery: Automatic, Simple, Reliable 8:30 AM -- Moscone Room 104 Building RAC Clusters over InfiniBand Real Application Clusters Data Guard Database Backup & Recovery Flashback Recovery LogMiner, Online Redefinition, and Cross Platform Transportable Tablespaces For More Info On Oracle HA Go To http://otn.oracle.com/deploy/availability/ Reminder – please complete the OracleWorld online session survey Thank you. QUESTIONS ANSWERS