Understanding how oracle internally manages the transactions is very crucial for your applications. Dealing with the database as a black box (sending queries and receiving results), will end up with bad performance to your application or/and non-scalable application. Oracle uses locks to internally manages the concurrent access to data.Only one transaction can modify any piece … Continue reading Oracle Database Locking Policy – Back to Basics
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Are you looking for a virtual machine to do some hands-on labs or practice something (i.e. for Educational purposes}? Do you have the time to build these virtual machines yourself? Below are some really nice Virtual Machines, that I invested allot of time to build on Oracle Virtual Box, and that I used them personally … Continue reading Oracle Virtual Machines for Sale !
covid is python package to track the Coronavirus spread in your country.It requires Python 3.6 or later.To install this package: pip install covid Following is a sample script to use this package to track coronavirus numbers for specific country ( here I use Egypt with id=71 as an example): Following is a sample output for … Continue reading Python Script to Track Coronavirus in Your Country
While trying to open one pluggable database, I got the following errors: Background: While installing Apex 20.1 in one PDB, and while being very close to the installation completion, the session fully stucked.I restarted the database (the CDB), then I tried to open the PDB, but I got the above errors. While searching for this … Continue reading Alter Pluggable Database Open – (ORA-00604/ORA-01405) After Apex Installation
I received a text file from a client that contains the output of one sql script (The output represents detailed statistics about all sql statements running in one critical database). The output is similar to the following: You can download a sample file similar to that of our client from:https://1drv.ms/u/s!ArrpKxPFc2APxRw0izNXIYqVHGdw?e=UCgUBs The output is not formatted … Continue reading Python Script to format the output of one SQL statement
This is a quick post about an issue that I faced while trying to start one database yesterday. When I was trying to open one 12cR1 database, I got the following error: SYS SQL>alter database open;alter database open*ERROR at line 1:ORA-38760: This database instance failed to turn on flashback database The database status was "mounted": … Continue reading ORA-38760 While starting an Oracle Database