SECURITY
11.10.2015

Secure your database (part 1)

I’ve already showed you, how to escalate privileges in Oracle Databases. https://blog.ora-600.pl/2013/04/02/privilege-escalation-in-oracle-11gr2-part1/ https://blog.ora-600.pl/2014/12/23/simple-technics-of-privilege-escalation-part2-dbasysdba/ The question is – how to secure your database, if you don’t have EE or possibility to buy Oracle Database Vault or Oracle Advanced Security. Well – there’s always a DBA creativity ­čśë For example – if you want to secure the […]


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[PL] Browar z Wyroczni─ů
04.09.2015

Jak smakuje Browar z Wyroczni─ů

I by┼éo tak, ┼╝e 31 dnia miesi─ůca sierpnia roku 2015, spotkali si─Ö┬áentuzja┼Ťci┬áWyroczni w posiad┼éo┼Ťci AVIVA. I by┼éo tak, ┼╝e dzier┼╝─ůc┬ákufle┬á– po brzegi browarem wype┼énione – zasiad┼éo wielu aby pos┼éucha─ç kilku, kt├│rzy chcieli si─Ö┬áprzemy┼Ťleniami swoimi podzieli─ç. I sta┼éo si─Ö tak, ┼╝e admin przepija┼é do dewelopera a deweloper do admina i pospo┼éu dyskusja toczy┼éa si─Ö wartka a […]


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RICO
03.09.2015

RICO

I’ve started the project called RICO – the tool, written in C++ for last resort data recovery. It can be used to extract data from corrupted datafiles and dump them in the form of text files. It is in the early development stage right now and the functionalities are narrowed to: Dump regular and partitioned […]


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12C
03.09.2015

12c – SQL plan directives

One of the new CBO features in database 12c is "sql plan directives". The main purpose of this functionality is to deliver better adaptive plans if object statistics does not reflect the reality. Quoting after documentation During SQL execution, if a cardinality misestimate occurs, then the database creates SQL plan directives. During SQL compilation, the […]


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I/O
17.07.2015

db file scattered read – MBRC and ASYNC IO on linux

Recently one of my students asked me if there is any correlation between the AU size in ASM diskgroup and parameter db_file_multiblock_read_count. I made some tests but results are very strange. I have 4 same tables, located in 4 different diskgroups: All tables are smaller then a hidden parameter "_small_table_threshold" so table access full on […]


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12c
25.05.2015

12c: duplicate pluggable database without READ ONLY mode

At the beginning we have to prepare parameter file for the new instance Start the instance in nomount Since I want to duplicate the database in active mode I will register it in LISTENER. To achieve this I have to add the following lines to the listener.ora Now we can perform active database duplication with […]


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ASM
14.05.2015

DBA: migrate database to ASM

Let’s try to migrate database to ASM diskgroup without big maintenance window. I have database and ASM (11.2.0.4) – the database is prepared to migration: We will use recoverable copy of database to migrate to ASM. The first run of this script will create copy of datafile on ASM: Subsequent executions of this script will […]


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ASM
14.05.2015

Install ASM manually using response file

I have configured two devices for ASM – one with ASMLib and one with UDEV: I have downloaded 11.2.0.4 grid infrastructure binaries and prepared response file: Of course in production environment you have set different groups for security reasons. If you think that you can ignore security, read my articles regarding privilege escalations: https://blog.ora-600.pl/category/oracle/security/ With […]


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12c (Spatial)
03.05.2015

12c: Spatial Vector Acceleration

There is a new feature in Oracle Spatial 12c, called "Spatial Vector Acceleration". According to Oracle: One of the most notable improvements with Oracle Spatial and Graph 12c can be seen in performance increases in vector data operations. Enabling the Spatial Vector Acceleration feature (available with the Spatial option) dramatically improves the performance of commonly […]


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