I make unpleasing sequences of 0s and 1s into pleasing sequences of 0s and 1s.
Ever had a customer asking about the growth of a table? Or suspect an execution plan change might be because of an influx of data into a table? Well you are in luck (maybe!). Oracle 10g and 11g have a months worth of historical statistics…
"The TPC-DS benchmark models the decision support system of a retail product supplier, including queries and data maintenance. Although the underlying business model of TPC-DS is a retail product supplier, the database schema, data population, queries, data maintenance model and implementation rules have been designed…
Was cruising StackOverflow today looking for interesting Oracle questions and noticed a DBA specific Stack has been started - it lives at http://dba.stackexchange.com/. It is database agnostic but I love the Stack setup and the helpful people it attracts. You can filter by Oracle and…
When trying to debug for another user sometimes it is helpful to be able to log in as that user. In the past magic was done by admins by storing the encrypted passwords, setting to a new temporary password, logging in, and then resetting the…
Jeremy Schneider posted his code to check the udump directory for trace files and allow remote to access them. Great for developer access or if you are automating access with a tool. Released as GPL as well so you are free to modify the code…
I recently got this error while trying to run a SQL Tuning Task against a SQL statement that was available in AWR but not currently in the library cache. I got around it by locating the SQL in OEM and using SQL Worksheet to execute…
Business logic. Sometimes it lives in the application, sometimes it lives in the database. I'll save the application/db argument for each individual case that I encounter. But if you do have significant business logic in your database, there will probably come a time when someone…
Oracle is supplying some ready-to-run downloadable VMs including Operating Systems, OSes with Oracle already installed and ready-to-run RAC systems. I was hoping to leverage these to save some time for sandbox environments but from what I have seen so far they are only for the…
Came upon this post during my travels. Jonathan Lewis reveals how to write a string to the Alert Log, Current Session Trace File, or Both. Also a few misc functions are included. dbms_system.ksdwrt(1,'test') writes to alert log dbms_system.ksdwrt(2,'test') writes to session's trace file dbms_system.ksdwrt(3,'test') writes…
I have a love/hate relationship with frameworks. Once you get proficient with a framework (like Application Express) you can get a lot done quickly. The framework can also stand in your way if you encounter a bug or maybe a gray area where the Framework…
> du .nfs* 0 .nfsFCE32 0 .nfsFDE93 0 .nfsFE2E 195048 .nfsDDE4 757032 .nfsE9BC11 .nfsxxxxx files are orphaned files that were deleted from an NFS mount but are still in use by a process. Once the final process using the file releases its file handle the…
I have a customer with a million row 125mb table. A query they are running returns very slowly: explain plan for SELECT * FROM BIGTABLE WHERE col1 IS NULL; SELECT * FROM TABLE(dbms_xplan.display); -------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes |…
Did you know that OEM has a built in interface for executing simple ad-hoc queries and recording the results? Here is how I set up a recurring query to find the number of user logins every 15 minutes and record the data. 1) Navigate to…
I recently had an issue where a query being submitted to the database had a large change in performance. I could attribute the change to a recent change in object statistics, but the query wasn't behaving because of a combination of a view, subquery, UNION,…
If you want to record copies of changed records on a target system you can do this with Golden Gate Software and not incur much in the way of source side resource drain. To capture changes you configure a Golden Gate Extract process. The Extract…