To clear this question we have this table: UNDO REDO Record of How to undo a change How to reproduce a change Used for Rollback, Read-Consistency Rolling forward DB Changes Stored in Undo segments Redo log files Protect Against Inconsistent reads in multiuser systems Data loss UNDO Undo tablespaces are special tablespaces used solely for…
Month: June 2008
What is the difference between Rollback and Undo Tablespace? OTN Forum By user user503050
There might be confusion while undo and rollback segment terms are used interchangeably in db world. It is due to the compatibility issue of oracle. Undo Oracle Database must have a method of maintaining information that is used to roll back, or undo, changes to the database. Such information consists of records of the actions…
EM mess – by Slyt – OTN Forum
I tried to run EM on certain host: [oracle@SQLAB db10g]$ emctl dbconsole start TZ set to Poland EM Configuration issue. /u01/app/oracle/product/10.2.0/db10g/SQLAB_e2k not found. OK. No such dir indeed. So: [oracle@SQLAB db10g]$ emca -config dbcontrol db -repos createblablabla Do you wish to continue? [yes(Y)/no(N)]: Y 2008-06-19 13:12:12 oracle.sysman.emcp.EMConfig perform INFO: This operation is being logged at…
want to migrate 9.2.0.1db on windows data to 10.2.0.2 db on SunOs10, and planning to use full exp/imp..will this work ? by DBA2008 – OTN Forum
Hi DBA2008, I recommend you to create all the structure first, then import all the data. Pre-create tablespaces, users, and tables in the new database to improve space usage by changing storage parameters. When you pre-create tables using SQL*Plus, either run the database in the original database compatibility mode or make allowances for the specific…
How to create a Temp Tablespace Group on 10g? by America OTN Forum
Tablespace Groups Oracle now has the concept of grouping multiple tablespaces together in what they call a tablespace group. This allows you to create multiple temporary tablespaces, assign these temporary tablespaces to a tablespace group, and then use the tablespace group as the default temporary tablespace for the database or user. The benefit this has…
can someone tell any difference between express edition and standard edition for oracle 10g – by seyiisq -OTN Forum
Oracle XE: Express Edition (XE) is a free, downloadable version of the Oracle database server. Oracle XE can only be used on single processor machines. It can only manage up to 4 GB of data and 1 GB of memory. ISVs can embed XE in 3rd party products and redistribute it freely. Oracle Standard Edition:…
What does g in Oracle 10g signify?
“G”rid is nothing but a term that is there to tell us that there are resources which are scattered at several different locations/pc’s but we are using and maintaining those resources as one. For us its just one thing that we are managing. The basic goal of grid computing is the transparency that should be given…
New SQL Developer 1.5 – Free by Oracle
For the fans of the old and good SQL*PLUS, TOAD (commercial use, but exists a free version with several limitations) and PL/SQL DEVELOPER (commercial use and version of evaluation for 30 days), who not yet know Oracle SQL Developer, I recommend try it, this tools is free and you can download it from OTN. This…
Oracle OpenWorld Latin America and Asia Pacific 2008?
There isn’t an Oracle OpenWorld Asia Pacific scheduled for this year. This year (2008) Oracle will not realise the Latin American and Asia Pacific Open World. Here is a list of events currently scheduled for 2009. Oracle OpenWorld Brazil – Sao Paulo, March 10 – 12, 2009 Oracle OpenWorld Japan – Tokyo, April 22 – 24,…
Logging or Not Logging:That is the Question v1.7
What is a Redo? Let’s conduct a brief summary about the redo process. When Oracle blocks are changed, including undo blocks, oracle records the changes in a form of vector changes which are referred to as redo entries or redo records. The changes are written by the server process to the redo log buffer in…