Clemens Bleile

Oracle Database Appliance: Install a DB Release Update manually

By Clemens Bleile Recently I upgraded an ODA X7-M from 19.12. to 19.13. After the dcs-, server- and storage-upgrade several databases on the machine had to be patched from 19.9. to 19.13. The [root@<node> ~]# odacli create-prepatchreport --dbhome --dbhomeid(…)

Oracle Database Appliance (ODA): Adjusting to the new ORACLE_BASE-setting from 19.11. onwards

By Clemens Bleile From Oracle Database Appliance (ODA) version 19.11. onwards the ORACLE_HOMEs and ORACLE_BASE will be created on ACFS, i.e. take space from an ASM-diskgroup instead of taking filesystem space from /u01. See this blog concerning details. If(…)

opatch hangs while patching OEM 13.4. concerning the log4j-vulnerability

By Clemens Bleile To address the log4j-vulnerability I recently had to fix the Oracle Enterprise Manager 13.4.-installation for a customer. REMARK: Please check the following link for details concerning the log4j-vulnerability and how Oracle is affected: alert-cve-2021-44228 and(…)

Script to calculate the network latency between the application and the Oracle DB-server

By Clemens Bleile Network latency is crucial for applications, especially if lots of “row by row”-processing (some call it “slow by slow”-processing) is used by the application or if lots of data is transported between the database and the application.

MacOS: Reduce fan noise when using Microsoft Teams

The Laptop I’m using for the business is a MacBook Pro, model 2019 (2.6 GHz 6-Core Intel Core i7). I’m thankful to be able to choose the Hardware and OS of my business laptop at dbi services. We have collegues(…)

Exadata Cloud at Customer: Considerations for Backup & Recovery

Working in a project where the customer migrates from an on-premises environment to Exadata Cloud at Customer provides insights about the decisions to take and what to consider when using the Exadata Cloud at Customer environment. In a series of(…)

ODA 19.11.: ORACLE_HOMEs on ACFS

Introduction Beginning with Oracle Database Appliance (ODA) 19.11. the ORACLE_BASE and ORACLE_HOMEs are created on ACFS. That’s good news, because there is much more space on ASM than on the internal disks, i.e. no space issues with /u01 anymore. So(…)

Creating an Oracle Snapshot Copy PDB on top of ASM

Creating a snapshopt copy Pluggable Database (PDB) on top of Automatic Storage Management (ASM) is not possible, because you need to have a filesystem which supports sparse files. According the following MOS-Note sparse files are supported on Automatic Storage Management(…)

Parameterized Views with SYS_CONTEXT in Oracle. How can the optimizer peek values?

There was a dicsussion a couple of years ago about a mssing feature in Oracle that the Optimizer is not peeking values when SYS_CONTEXT is being used in a predicate. I.e. specifically when using SYS_CONTEXT in Views to simulate passing(…)

Adding nmon to Oracle OSWatcher

nmon (nmon is short for Nigel’s performance Monitor for Linux on POWER, x86, x86_64, Mainframe & now ARM (Raspberry Pi)) is a nice tool to monitor a Linux system. Originally it came from the AIX-platform, where it is very(…)