Below are major technology announcements or highlights that came from the Oracle OpenWorld conference 2019. Most of them are round Oracle Cloud (OCI), Oracle Autonomous database, Exadata and Linux
Redwood – New User Experience Design
If you navigate to www.oracle.com or cloud.oracle.com you see the new Oracle look & feel called „Redwood“. In future all Oracle Presence will follow this new Modern UX Design, including GUI of Cloud & On-Premises.
Connectivity between OCI & Azur Cloud
Oracle announces close partnership with Microsoft in the area of Oracle Cloud Infrastructure & Microsoft Azure by introducing High Speed Interconnect between OCI & Azur Clouds:Read more »
Often in a complex enterprise Infrastructure Oracle DBAs face issues by enabling SMTP mail traffic on the databases through corporate email gateway servers. Imagine you have to provide your database applications an ability to send emails via Simple Mail Transfer Protocol (SMTP) protocol from Oracle database. Below I give a detail action plan to accomplish the same. My test example includes an Oracle database 11gR2 running on Linux RedHat 6 and a Microsoft Exchange corporate server.
1. Oracle packages SYS.UTL_SMTP and SYS.UTL_TCP
Check if Oracle packages SYS.UTL_SMTP and SYS.UTL_TCP are available on Oracle database and you have EXECUTE grants on them.
2. Check SMTP access of database Linux server on mail server
– Check whether you are able to contact the email gateway server via SMTP from the database Linux box:
$ telnet smtp_server 25
If you see blank screen or an error: “telnet: Unable to connect to remote host: Connection refused”,
your DB server is not recognized by the SMTP server. In this case you have to apply for mail SMTP access.
Otherwise type the following commands to test sending email from Linux to your corporate email account:
helo mail from: my_email@my_company.com # you should see "Sender OK' rcpt to: my_email@my_company.com # you should see "Recipient OK" data # Start mail input test email via SMTP and orcl DB [Enter] . # mail should be sent [Enter] quit
3. Apply for mail SMTP access
Contact your mail (exchange) admins and apply for SMTP access on your corporate smtp mail gateway server. Below is an example: Read more »
Issue / Oracle error
SQL*Plus: Release 10.2.0.5.0 - Production on Wed May 18 09:32:35 2011
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ORA-12547: TNS :lost contact when try to connect to Oracle.
I saw that TNS connection issue along with ORA-12547 Oracle error several times, usually when trying to connect to Oracle database server on Unix / Linux host with an OS user that does not belong to oinstall group (Oracle binaries owner group). In this case, interesting enough that local TNS connection to database (when using tnsnames alias) works fine: Read more »
Working as Oracle DBA on HP-UX and Linux both I prefer Bash shell which is available on Linux compared to Korn shell which is default shell on HP-UX. It’s more convenient to work on Linux Bash using handy key combinations, etc. Unfortunately Bash is not installed on HP-UX by default and also not officially supported there – you will not get help from HP support if problems with it arise.
Nevertheless, I could find a way of improving environment settings on HP-UX to make the backspace and some other keys work similar to Linux and Bash shell. Read more »
I’ve recently notices a common issue on Oracle Enterprise Linux 5.x with Oracle database 10gR2 and 11gR2. The Oracle ADDM Performance Analysis showed the following alert as a top event in both OEM console – Virtual Memory Paging and in the ADDM report – Significant virtual memory paging was detected on the host operating system.
From the first look I thought this was a virtual memory issue on the boxes but on the other hand I could not find any evidence at OS level of any problem with virtual memory paging. Additionally I was surprised that the issue occurred at the same time on different servers and Oracle versions. So, below I did some checks to prove there was no memory issue on these Linux boxes. Read more »