Oracle

Recommended DB Parameters on the Oracle Database Appliance (ODA)

When creating a DB on the ODA using # oakcli create database -db <db-name> a template is used to set a couple of DB parameters like e.g. _datafile_write_errors_crash_instance=FALSE _db_writer_coalesce_area_size=16777216 _disable_interface_checking=TRUE _ENABLE_NUMA_SUPPORT=FALSE(…)

ODA X6 installation: re-image

By Franck Pachot . The Oracle Database Appliance is shipped with a bare-metal installation which may not be the latest version. You may want to have it virtualized, or get the latest version to avoid further upgrade, or install an(…)

12c Multitenant Internals: VPD for V$ views

By Franck Pachot . I described in an earlier post on AWR views how the dictionary views were using metadata and object links to show information from other containers. But this mechanism cannot work for fixed(…)

12cR2 Application Containers and Foreign Keys

By Franck Pachot . Application Container brings a new way to share data among databases, and adds a new dimension to referential integrity. A foreign key in an application PDB can reference a row belonging to a root data link(…)

12cR2 PDB refresh as a poor-man standby?

By Franck Pachot . Disclaimer My goal here is only to show that the Refreshable PDB feature works by shipping and applying redo, and then can synchronize a copy of the datafiles. I do not recommend to use it for(…)

Workaround for bug 19566227/20563128 doing Cross Platform Migration (MOS Note 1389592.1)

In a project I have to move an Oracle 11.2.0.4-DB (around 7TB in size) from Sparc Solaris (called Source in the remainder of this Blog) to Linux x86-64 (called Target in the remainder of the Blog). I.e. a platform migration(…)

random “ORA-01017: invalid username/password” in 12cR2

By Franck Pachot . Since 12cR2 is out, we give our 12c new feature workshop with hands-on exercises on 12.1 and 12.2 releases. When I gave it last month, I had a small problem when doing(…)

Trace files segmented in multiple parts as a workaround for bug 23300142

Today I visited a customer, who deleted a Data Guard configuration (i.e. a temporary Data Guard setup through the broker was deleted). The LOG_ARCHIVE_DEST_STATE_2 on the primary database was set to DEFER temporarily. That resulted in trace-files with name *tt*.trc(…)

How many members for standby redo logs?

By Franck Pachot . I see lot of databases with two members for redo logs and also two members for standby redo logs. Why not, but when asking I realized that there are some mis-comprehension about it. And what was(…)

Oracle 12cR2: changes for login.sql

By Franck Pachot . If you use a login.sql script to set the SQL*Plus environment from your current working directory, you will see that it will not run anymore in 12.2. This is a security feature, and a good occasion(…)