Autore: admin

How to solve ORA-04021: timeout occurred while waiting to lock object

Compile an object can give the following error Quire the process to find the session that still running select a.object, a.type, b.sid,b.serial#,s.inst_id, b.username, b.osuser, b.program, s.status, s.sql_exec_start from v$access  a, v$session b, gv$session s where a.sid    = b.sid and a.owner  = DECODE(UPPER(‘&1’), ‘ALL’, a.object, upper(‘&1’)) and a.object = DECODE(UPPER(‘&2’), ‘ALL’, a.object, upper(‘&2’)) and b.sid =…
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11 Marzo 2019 0


When you work with xml file you should be solve the scenery that have an node with its properly sub node. In our case the following nodes () ; () . It is quite delicate find exactly approach that gives to you the requirement expected. The problems that I have got they were two different:…
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17 Luglio 2018 0

Oracle Database 18c: My preferred new features for DBAs

Oracle Databse 18c comes with some cool new features for DBAs. In this article I’ll list my preferred ones. Just one note: I think the name “Autonomous Database” is quite misleading, as it means that some of the new features COULD be used to configure your database as “autonomous” where previous versions required some maintenance,…
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18 Aprile 2018 0

Create Sequence-Oracle Database 12c

Database version : from Oracle Database 12cR1 Create sequence with session or global option When a sequence number is generated, the sequence is incremented, independent of the transaction committing or rolling back. SESSION option makes opportunity to create sequence that can used in association with global temporary table then its visibility is just for session.…
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1 Marzo 2018 0


Introducing the topic: In list partitioning, the database uses a list of discrete values as the partition key for each partition. You can use list partitioning to control how individual rows map to specific partitions. By using lists, you can group and organize related sets of data when the key used to identify them is…
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7 Febbraio 2018 0

ORACLE 12 rel.2 – Partitioning new features

In Oracle 12c rel.2 a great number of enhancements to the Oracle database Partitioning option have been introduced. These include: Automatic List Partitioning Filtered Partition maintenance operations Multi-Column List Partitioning Online conversion of non-partitioned to partitioned table Read-only Partitions Partitioned External Tables Automatic List Partitioning: The ability to partition a table based on distinct values…
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5 Gennaio 2018 0

ORACLE 18C – Autonomous Database Cloud

At Oracle OpenWorld 2017, Oracle Chairman of the Board and CTO Larry Ellison unveiled his vision for the world’s first autonomous database cloud. Powered by Oracle Database 18c, the next generation of the industry-leading database, Oracle Autonomous Database Cloud uses ground- breaking machine learning to enable automation that eliminates human labor, human error and manual tuning,…
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6 Dicembre 2017 0

ORACLE 12C M.T.S. model

Until Oracle Database 12c, Oracle processes did not run as threads on UNIX and Linux systems. Every dedicated connection was represented by an operating system process. In systems where high workload was an issue, the only way to reduce CPU and memory usage was to switch from dedicated connections to shared connections using the multithreaded…
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22 Novembre 2017 0


Per impostare il nome dell’istanza sul prompt della macchina e contestualmente il nome utente e il nome dell’istanza in sqlplus eseguiamo con le seguenti modifiche: ENV PDB – Modificare l’export dell’istanza nell’env del PDB inserendo il nome del pluggable database export ISTANZA=RELAUP – Cambiare nell’export della variabile PS1 ORACLE_SID con ISTANZA export PS1='\u@${HOSTNAME}:${ISTANZA} # '…
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8 Novembre 2017 0


Two-phase commit protocol is comprised of a set of actions that ensure a transaction involving multiple databases does not produce unsynchronized updates. Two-phase commit provides a way for a series of database interactions on multiple different data sources to be grouped together and completed or rolled back as a single transaction. Two-phase commit transactions that…
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16 Ottobre 2017 0