Clemens Bleile

Running PLSQL as SYSDBA through DEFINER-rights?

Recently I got an interesting request: The customer wanted to allow the application installation routine to create a guaranteed restore point without giving it all required privileges to do so. So the idea was to encapsulate creating and dropping a(…)

Restarting a failed transportable tablespace metadata import

I’m currently working in a project to migrate a Datawarehouse-database from Solaris to Linux Intel (Endian-change). We do use the cross platform incremental backups method as described in My Oracle Support Note 1389592.1 for that. I.e. incremental backups are(…)

sqlplus and its column output

During tuning or normal DBA activities one of the most annoying things is sqlplus with its default column output when running queries. I.e. even after setting a linesize of 1000 and a pagesize of 1000 the output may look as(…)

Connect-times to the DB suddenly become very slow using sqlcl

I recently wrote a couple of sql-scripts which had to run on all of my customer’s DBs. The sql-scripts had to be started from a Linux-client, which does not have any Oracle client software installed. So I thought of using(…)

CPUs: Cores versus Threads on an Oracle Server

When doing a performance review I often do talk with the DBA about the CPU utilization of the server. How reliable is the server CPU utilization with tools like top or the host CPU utilization in the AWR-report? E.g. on(…)

Running the Oracle Client on a Raspberry Pi

What are the possibilities to use a Raspberry Pi computer as an Oracle client? Besides other things I’ll show a possibility in this Blog to run the fat/thick Oracle Client on a Raspberry Pi! REMARK: All examples below(…)

Transfer redo in async-mode to the Gold/Master copy of the Production DB for ACFS snapshots

If you store your databases on the cluster filesystem ACFS you may use the provided Perl-script gDBClone from OTN to clone databases or create snapshot databases. It is an interesting approach to create clones from the Production DB(…)

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(…)

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(…)

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(…)