http://asktom.oracle.com These are the questions on Ask Tom that have the most comments en-us Copyright 1999-2006, Oracle Corporation http://asktom.oracle.com/i/asktom2.gif http://asktom.oracle.com 50 50 Ask Tom is a forum where Tom Kyte, Oracle's Database Guru, answers questions regarding Oracle technology, specifically the database. http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:2053989900346972822 Hi Tom, We run a large data warehouse with giant tables that have to be copied to multiple destination databases. We copy them via db-link / export-import, etc. We need a dependable mechanism that would QA and ensure that the copies are precise... 2009-10-21 http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:2048810500346778955 Tom, I have inherited a production database that is storing some numbers and data as char datatype. For example, a char column with size 5 is storing values like '0055', '0045'. Another instance is storing Month and year separately as October a... 2009-10-20 http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:2076418600346512388 Hello Tom, http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:549370300346187664 while reading above URL I came across your response to phil "Affecting performance?" you compare the insert between heap and hash partition t... 2009-10-29 http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:2049482400346842460 Hi Tom, Since a while 'you're not a DBA anymore'. (http://tkyte.blogspot.com/2009/09/im-not-dba-anymore.html) Almost everyday I do some searches on AskTom, and it occurs to me that since you've 'retired' results differ from what I used to get. ... 2009-10-20 http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:2048698000346552812 Hi Tom, Good Day. We have an application built almost 4 years ago by a group of DBAs and Architects. In all the tables, they have a column called ID__ which is of Number data type. For example, please consider the following example: create t... 2009-10-20 http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:2049072400346231785 Hi Tom, Good Day I was reading a book written by a popular author (I would prefer not to mention the name of the book and its author). He says: In discussion on bitmap indexes, the following was written: "Concatenated B*tree indexes were ... 2009-10-20 http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:2069192400346295147 Hi Tom, If we do not have a *guaranteed* undo_retention... And if we have a fixed amount of undo disk space Is there any benefit to increasing the value of UNDO_RETENTION? Whether the value of UNDO_RETENTION is 100 or 1000000 won't Oracle k... 2009-10-27 http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:2049854700346206674 Hi Tom, I am using instead-of triggers in a little PoC. As part of the trigger logic I need to determine which columns the user specified (if any) in the triggering update or insert statement. Do you know of a simple way to retrieve this? ... 2009-10-20 http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:2102974100346291206 Hi Tom, Starting with Oracle 6, I've watched Oracle become more powerful by the release. However, I also consider as new things replace old things, how the sum of the parts becomes more complex and less elegant as convenient syntax is deprecated (... 2009-11-09 http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:2109833600346625821 Tom, I have 2 questions about ASM performance. 1. We have a 10.2.0.4 database which we migrated from RHEL3 32-bit using 'regular' file system to RHEL5 64-bit 10.2.0.4 database using ASM. There is a particular batch job which began running about... 2009-11-11