Monthly Archives: March 2011

What’s the difference between logfiles and archive logfiles ?

The log files are part of the database, called online redo files. These hold the transactions from the database not already on disk allowing recovery in the event of a database crash. These are then turned into offline redo files, … Continue reading

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Configure Rman to Purge Application standby logs.

Configure RMAN to purge archivelogs after Application on standby.

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Loading data through external tables.

Loading eternal csv data. Here’s a working example of checking for a file and loading the data into another table.

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ORA-39001: invalid argument value with dbms_datapump

DBMS_DATAPUMP, usage and errors.

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ORA-01274: cannot add datafile

Automatically adding a datafile on the physical standby database. On production. SQL> alter tablespace my_db add datafile ‘/oradata/data/my_db/my_db_DATA_11.ora’ 2 size 100m autoextend on next 100m maxsize 20g; On Standby. SQL> select ts# from v$tablespace where name = ‘my_db’; TS# ———- … Continue reading

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Optimal Redo Log Size

Tuning my physical standby, a metalink note stated to tune the optimal logfile size.

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ORA-00494: enqueue [CF] held for too long (more than 900 seconds) by ‘inst 1, osid 70070′

ORA-00494, instance crashes. ORA-00494: enqueue [CF] held for too long (more than 900 seconds) by ‘inst 1, osid 70070′ occured where a problem exists on getting a control file enqueue lock by the LGWR. However the instance shutsdown because CTKP … Continue reading

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Revolution Analytics and IBM Netezza Bring Enterprise-Ready R to the Data Warehouse

New relationship brings Revolution R Enterprise to IBM Netezza’s TwinFin Data Warehouse Appliance Customers

Predictive Analytics World 2011 SAN FRANCISCO–14, March 2011–PREDICTIVE ANALYTICS WORLD, Booth #107 and #112 – Revolution Analytics, the l… Continue reading

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Creating a network ACL.

A client upgraded from 10g to 11g, but the consultant didn’t consider the fact that they were using network connections with http.

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Querying Materialized Views.

How can I tell when my Materialized Views should refresh ?

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