Oem 12C Bundle Patch

Oracle slow SQL query against dbasegments solved. July 1. 8, 2. 01. Kirill Loifman I remember when long time ago one database consultant confused my manager saying that our Oracle 9i database had poor performance just taking into account a slow response from dbasegments data dictionary view. That was a nasty trick to blame a DBA and the Oracle database for poor performance at that time. In fact there were a few Oracle bugs related to those performance issues after switching from dictionary to locally managed tablesspaces at that time. Recently Ive noticed similar performance degradation on Oracle 1. R2 1. 1. 2. 0. 2 and 1. Kilauea Mount Etna Mount Yasur Mount Nyiragongo and Nyamuragira Piton de la Fournaise Erta Ale. Express Helpline Get answer of your question fast from real experts. No more missed important software updates UpdateStar 11 lets you stay up to date and secure with the software on your computer. DBASEGMENTS or USERSEGMENTS data dictionary views involving the columns BYTES, BLOCKS, or EXTENTS. Queries on DBATSQUOTAS or USERTSQUOTES on columns BYTES or BLOCKS were also slow. Even if you personally do not care about these dictionary views they are still very important since they are used by some Oracle internal components and the other database tools including Oracle Enterprise Manager OEM Cloud Control and its Database Home Page. Thus, Ill describe below the problematic of those data dictionary views and the way how to fix their performance issues. First of all do not wonder why queries against those views often seem to slow. Oem 12C Bundle Patch' title='Oem 12C Bundle Patch' />Describes how you can install Enterprise Manager Cloud Control 12c Release 5 12. Oracle Management Service, and a standalone Oracle Management. A supplier of spare and production parts for commercial and military aviation. DBASEGEMENTS for example is a very complex view that is built on another SYSDBASEGS view. In summary DBASEGMENTS view on Oracle 1. R2 consists of the following components 2. SQL code 3 UNION ALL clauses A lot of joins between following tables sys. The main performance problem here however is that the values of the BYTES, BLOCKS EXTENTS columns of the DBAUSERALLSEGMENTS and DBAUSERALLEXTENTS views are not stored in the Data Dictionary for segments that reside in Locally Managed Tablespaces. Oracle offers a comprehensive and fully integrated stack of cloud applications and platform services. Today we announced the general availability of AWS Elemental MediaLive, a live video processing service that enables video providers to encode highquality live video. Instead they must be obtained by accessing the Segment Header Blocks for all segments processed in the query. These extra block accesses cause the slow performance. So with increasing number of database files and segments the query performance in this case can potentially degrade. Furthermore Oracle in certain circumstance does not cache properly those segment header blocks, thus forcing reading them from disk even at the next query run so no caching happening. Do not be surprised if I say that a query against dbasegments can trigger even at the background a few more procedures from DBMSSPACEADMIN package to get correct segment sizing information. All in all, the symptoms of performance degradations with these dictionary views can vary. In my last case they were even different on different database platforms. If you encounter similar performance issues I strongly recommend contacting Oracle support. Additionally Ill share below how I fixed my last case on Oracle 1. Check if you have slow segments on your database with slow dbasegments, dbaextents, etc. DECODEbitandsegmentflags,1. Wealthy Barber Ebook. ROLLBACK, DEFERRED ROLLBACK, TYPE2 UNDOgroup by tablespacenamehaving sumDECODEbitandsegmentflags,1. If you see thousands of segments this can lead to poor query performance. In case you see a few of them, even hundreds, I would keep monitoring further with the same SQL to see if the number of slow segments increases. If case of one of the above or both, go to next steps. Ensure you apply an Oracle Patch for a Bug 1. SEG not updated after adding an extent. Based on Oracle, the Bug is fixed in the following database versions 1. Base Release1. 1. Server Patch Set1. Database Patch Set Update. Bundle Patch 1. 4 for Exadata Database. Patch 1. 3 on Windows Platforms. Patch 2. 3 on Windows Platforms. Note, that in my case however patching a database to Oracle 1. R2 1. 1. 2. 0. 3. Itanium HP UX platform. I could fix it only with 1. After applying the patch, you can run the following PLSQL block as sysdba which corrects sizing information on the segments beginfor t in select distinct tablespacenamefrom sys. ROLLBACK, DEFERRED ROLLBACK, TYPE2 UNDOand tablespacename SYSTEMloopdbmsspaceadmin. Its advisable to take a database backup before the above SQL execution. Additionally I would not run that SQL against SYSTEM tablespace thats why SYSTEM is excluded in the SQL unless its recommended by Oracle Support. So that was a few insides in Oracle slow segments issue and the troubleshooting example of slow SQL query performance against dbasegements view on Oracle database 1. R2. Enjoyed this article Please share it with others using the social site of your choice Filed under. Oracle, Oracle troubleshooting Tags. R2, database, dbasegments, Oracle, performance, SQL. Monitoring Exadata database machine with Oracle Enterprise Manager 1. Oracle Enterprise manager Grid control, is hands down the best monitoring and management tool, for the oracle exadata database machine. It comes with plugins to monitor all the hardware components of the database machine, and sensible, preset thresholds for proactive monitoring. Update Nov 2. 01. Enterprise manager 1. Certified to be used with exadata. The master MOS note 1. Some key points. You should use 1. R1 enterprise manager grid control for monitoring. You should use 1. R1 enterprise manager agents, to monitor the targets on the database machine. If you use enterprise wide monitoring tools like tivoli, openview or netcool, use snmp traps from oracle enterprise manager, to notify these monitoring tools ie dont try to directly use snmp to monitor the exadata components. You could do this but it will be too time consuming. You could potentially use 1. Oem, with 1. 1g agents to monitor the dbmachine, but this is not recommended as a stablelong term solution. The following components And more can be monitored using Enterprise Manager. Databases hosts. Exadata Cells. Cisco switch. KVM Keyboard, Video, MouseILOM Monitoring. Infiniband switch. Power distribution unit PDUYou have 3 possible options to configure enterprise manager. If you have an existing 1. R1 enterprise manager grid control envrionment, you can patch it with the recommended patches and use that for monitoring the dbmachine targets. You can setup and configure a brand new 1. R1 enterprise manager grid control environment On a separate server and configure it to monitor the dbmachine targets. Download the required software. Weblogic server 1. MOS Note 1. 10. 61. Jdk 6. 4 bit Mos Note 1. R1 Oms from download. Install Java and Web Logic Server WlsPatch Web Logic Server. Install 1. 1g. R1 Enterprise manager Oracle Management Server OMSInstallCreate a 1. R2 database to serve as the Enterprise Manager Repository. Database pre reqs for 1. Mos Note 1. 06. 44. InstallConfigure Oms Mos Notes 1. Patch OMS with the required patches to enable database machine monitoring. You can use an easy install option to setup and configure an enterprise manager environment and configure the plugins. The easy install is delivered as a  patch 1. EMGC setup automation kitThe configuration worksheet has to be filled out properly Before the installation and the em. Follow the instructions in the readme to do a quick install of a fully configured 1. R1 Enterprise manager installation. This method helps you installpatch  and configure the full 1. R1 oms in just an few steps and is a huge time saver. Download the required plugins to monitor the following components. Download the plugins from the enterprise manager extensions exchangehttp www. Exadata cell pluginhttp www. All the rest of the pluginsInstall and Configure the Agent and the Plugins       Additional tutorials with screenshots on configuring the plugins can be found below. Sending SNMP traps to 3rd party monitoring tools. Get the Mib Management Information Base file from your enterprise manager management server and send it to the 3rd party tool administrator eg openview or netcool. Follow MOS note 3. MIB file. Then configure your notification methods and rules to send the required snmp traps to the 3rd party tool.