Category: Tips and Tricks

Feed: Striving for Optimal Performance. By default, the database engine automatically takes snapshots in the root container only. Such snapshots cover the root container as well as all open PDBs belonging to it. From version 12.2 onward, you can control whether the database engine automatically takes also PDB-level snapshots through the dynamic initialization parameter AWR_PDB_AUTOFLUSH_ENABLED. In case you want to enable that feature, you have to carry out two operations: Set the initialization parameter AWR_PDB_AUTOFLUSH_ENABLED to TRUE (the default value is FALSE) either in a specific PDB or, if you want to enable it for all PDBs, in the root ... Read More

Feed: Striving for Optimal Performance. From version 12.1.0.2 onward, for taking AWR snapshots, you have the choice between four AWR flush levels: BESTFIT, LITE, TYPICAL and ALL. If you check the Oracle Database documentation, you won’t find much information about the difference between them. The best you will find, in the PL/SQL Packages and Types Reference, is the following: The flush level can be one of the following: BESTFIT: Uses the default value depending on the type of snapshot being taken. LITE: Lightweight snapshot. Only the most important statistics are collected. This is default for a pluggable database (PDB) and ... Read More

Feed: Kamran Agayev's Oracle Blog. 24 hours passed – still at work. Struggling to start up the database which was corrupted during cell storage rolling restart procedure. And I’ve never seen some Oracle error messages that I saw today. So here what is happened: ################Exadata storage cell failure during so-called “rolling cell storage restart”. Data file headers are corrupted for some files just because of rolling restart of storage cells and it can’t read the mirror file in the normal redundancy diskgroup as well!!! Both are corrupted! SR created – but there’s no reply!################ Read of datafile '+###1/###i/datafile/###_6077.1015929889' (fno 1367) ... Read More

Feed: Striving for Optimal Performance. In this short post I would like to point out a non-obvious issue that one of my customers recently hit. On the one hand, it’s a typical case where the query optimizer generates a different (suboptimal) execution plan even though nothing relevant (of course, at first sight only) was changed. On the other hand, in this case after some time the query optimizer automatically gets back to the original (optimal) execution plan. Let’s have a look at the issue with the help of a test case… The test case is based on a range partitioned ... Read More

Feed: Kamran Agayev's Oracle Blog. Today, while creating an empty database in Exadata machine where there was enough free space and memory, we got the following error: SYS@TEST> startup nomount ORA-27154: post/wait create failed ORA-27300: OS system dependent operation:semget failed with status: 28 ORA-27301: OS failure message: No space left on device ORA-27302: failure occurred at: sskgpbitsper The problem wasn’t related with the space at all, even from the error message we see “No space left on device”. From the error output, I realized “OS system dependent operation:semget“, where “sem” means “semaphore“. Having enough free memory and space, the process ... Read More

Feed: Kamran Agayev's Oracle Blog. Python is getting more popular nowadays, because it is reliable and efficient, it has great corporate sponsors, and because of it’s amazing libraries that helps you to save time during the initial development cycle. It’s much more easy to connect to an Oracle Database from Python by using cx_Oracle module. To get more information about cx_Oracle module, check the following links: https://oracle.github.io/python-cx_Oracle/  https://cx-oracle.readthedocs.io/en/latest/installation.html In this blog post, I will show how to install Python and configure the environment and connect to the database. First of all, make sure you’ve an internet connection and install Python ... Read More

Feed: Striving for Optimal Performance. The contents of the V$SQL_CS_HISTOGRAM view is used by the SQL engine to decide when a cursor is made bind aware, and therefore, when it should use adaptive cursor sharing. For each child cursor, the view shows three buckets. It is of general knowledge that the first one (BUCKET_ID equal 0) is associated with the executions that process up to and including 1,000 rows, the second one (BUCKET_ID equal 1) with the executions that processes between 1,001 and 1,000,000 rows, and the third one (BUCKET_ID equal 2) with the executions that processes more than 1,000,000 ... Read More

Feed: Kamran Agayev's Oracle Blog. Last week we had a clusterware issue on one of the critical 3 node RAC environment. In the first node, network resource is restarted by ending up killing all sessions on that node abnormally. Oracle VIP that was running on that node failed over to the third node. The first node was up and running, but didn’t accept connections because it was trying to register the instance using LOCAL_LISTENER parameter where the oranode1-vip was specified that was not running on that node. We tried to relocate it back to the first node, but it failed ... Read More

Feed: SQL Server Customer Advisory Team. Author: Denzil Ribeiro. This article was co-authored by Dimitri Furman and Denzil Ribeiro Reviewed by: Danimir Ljepava, Borko Novakovic, Jovan Popovic, Rajesh Setlem, Mike Weiner Introduction In our ongoing engagements with the SQL DB Managed Instance preview customers a common requirement has been to monitor database workload performance in real time. This includes not just monitoring of a single (or a few) performance metrics, but being able to look at many relevant metrics at once, within seconds of events occurring. While much of the needed performance data is available in various DMVs, consuming it ... Read More

Feed: Kamran Agayev's Oracle Blog. Last month, after long brainstorm, I decided to take my chance and accepted my participation at Indian Oracle ODev Yathra tour. Despite the fact that I’ve visited India (Hyderabad) 2 times in the past for the Sangam conferences, I wanted to discover India more and decided to take 4 cities out of 7. For the Yathra Tour I submitted 2 papers: The first one was about “8 ways to migrate your On-Premis database to Oracle Cloud” where I was talking about different ways to migrate the database based on the downtime and the migration requirements ... Read More