Infrastructure at your Service
In a recent project we migrated an Oracle database previously running on 12.1.0.2 on an Oracle Database Appliance to an Exadata X8 with DB version 19.7. Shortly after the migration a merge-statement (upsert) failed with an ORA-07445: exception encountered: core dump [kdu_close()+107] [SIGSEGV] [ADDR:0xE0] [PC:0x1276AE6B] [Address not mapped to object] [] The stack looked as follows: kdu_close – updThreePhaseExe – upsexe – opiexe – kpoal8 – opiodr – ttcpip – opitsk – opiino – opiodr…
There are several methods to find out where time is spent in an execution plan of a query running in an Oracle database. Classical methods like SQL Trace and running a formatter tool like tkprof on the raw trace, or newer methods like SQL Monitor (when the Tuning Pack has been licensed) or running a query with the GATHER_PLAN_STATISTICS-hint (or with statistics_level=all set in the session) and then using DBMS_XPLAN.DISPLAY_CURSOR(format=>’ALLSTATS LAST’). However, what I often…
A couple of weeks ago I upgraded an Oracle Standard Edition 2 test database from 12.1.0.2 to 12.2.0.1 (with the April 2020 Patch Bundle) on Windows. Recently I upgraded the production database. Both upgrades were done with the Database Upgrade Assistant DBUA. I didn’t use AUTOUPGRADE because I had to upgrade only 1 database and the DBUA handles everything for me (including changing the necessary Windows services and update the timezone file). Both upgrades did…
By Clemens Bleile To prepare a presentation about Multitenant Tuning I wanted to see the METHOD_OPT dbms_stats global preference of all my pluggable DBs. In this specific case I had 3 PBDs called pdb1, pdb2 and pdb3 in my CDB. For testing purposes I changed the global preference in pdb1 from its default ‘FOR ALL COLUMNS SIZE AUTO’ to ‘FOR ALL INDEXED COLUMNS SIZE AUTO’: c##[email protected]@PDB1> exec dbms_stats.set_global_prefs(‘METHOD_OPT’,’FOR ALL INDEXED COLUMNS SIZE AUTO’); c##[email protected]@PDB1> select…
By Clemens Bleile After cloning e.g. a production database into a database for development or testing purposes, the DBA has to make sure that no activities in the cloned database have an impact on data in other production databases. Because after cloning production data jobs may still try to modify data through e.g. db-links. I.e. scheduled database jobs must not start in the cloned DB and applications connecting to the cloned database must not modify…
To save resources I thought about the idea to start an Oracle database automatically when a first connection comes in. I.e. if there are many smaller databases on a server, which are not required during specific times, then we may shut them down and automatically start them when a connection comes in. The objective was that even the first connection should be successful. Is that possible? Yes, it is. Here’s what I did: First of…
On this Blog I described on how to install Oracle XE on a current Linux Mint version (19.3. Tricia when writing the Blog). After the conversion of the Oracle provided rpm to a deb installation file with the tool alien, you can install the Oracle XE software with a simple command [email protected]:/opt/distr# dpkg -i oracle-database-xe-18c_1.0-2_amd64.deb If the installation fails or the XE database cannot be created with the configuration script later on, then you have…
On my old Laptop (Acer Travelmate with an Intel Celeron N3160 CPU) I wanted to install Oracle XE. Currently the available XE version is 18.4. My Laptop runs on Linux Mint 19.3 (Tricia). The Blog will describe the steps I had to follow (steps for Ubuntu would be similar). REMARK: The following steps were done just for fun and are not supported and not licensable from Oracle. If you follow them then you do it…
During tests in Oracle 19c I recently experienced this: [email protected]@orcl> select * from demo4 where m=103; [email protected][email protected]> select * from table(dbms_xplan.display_cursor); … ————————————————————————— | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | ————————————————————————— | 0 | SELECT STATEMENT | | | | 26439 (100)| | |* 1 | TABLE ACCESS FULL| DEMO4 | 1 | 10 | 26439 (14)| 00:00:02 | ————————————————————————— –> The costs of the full table…
ARRAYSIZE or ROWPREFETCH in sqlplus? What is the difference between the well known sqlplus-setting arraysize and the new sqlplus-12.2.-feature rowprefetch? In Blog https://blog.dbi-services.com/oracle-fasttrue-in-sqlplus-some-thoughts-about-rowprefetch/ I showed a case, which helps to reduce the logical IOs when using rowprefetch. Here the definition of arraysize and rowprefetch according the documentation: arraysize: SET System Variable Summary: Sets the number of rows, called a batch, that SQL*Plus will fetch from the database at one time. Valid values are 1 to…
