Showing entries 31 to 40 of 1535
« 10 Newer Entries | 10 Older Entries »
Displaying posts with tag: Oracle (reset)
Log Buffer #450: A Carnival of the Vanities for DBAs

This Log Buffer Editions picks few blog posts from Oracle, SQL Server and MySQL.

Oracle:

  • If you grant the DBA role to a user, Oracle also grants it the UNLIMITED TABLESPACE system privilege. If you then revoke the DBA role from this user, Oracle also revokes its UNLIMITED TABLESPACE system privilege.
  • Lost SYSMAN password OEM CC 12gR5.
  • How Terminal Emulation Assists Easy Data Management.
  • Using EMCLI List Verb …
[Read more]
Motivation to Migrate RDBMS

http://www.itnews.com/article/3004953/use-oracles-database-watch-out-for-this-dec-1-deadline.html

Companies that use a standard edition of Oracle’s database software should be aware that a rapidly approaching deadline could mean increased licensing costs.

Speaking from experience (at both MySQL AB and Open Query), typically, licensing/pricing changes such as these act as a motivator for migrations.

Migrations are a nuisance (doesn’t matter from/to what platform) and are best avoided as they’re intrinsically painful, costly and time-consuming. Smart companies know this.

When asked in generic terms, we generally recommend against migrations (even to MySQL/MariaDB) for the above-mentioned practical and business reasons. There are also technical reasons. I’ll list a …

[Read more]
Log Buffer #449: A Carnival of the Vanities for DBAs

 

This Log Buffer Edition covers some of the niftiest blog posts from Oracle, SQL Server and MySQL.

Oracle:

  • OBIEE 11g and Essbase – Faking Federation Using the GoURL.
  • You can use one of these to link an exception name with an Oracle error number. Once you have done this, you can use the exception name in the exception block which follows the declaration.
  • This is a short post to help out any “googlers” looking for an answer to why their 12.1.0.5 EM Cloud …
[Read more]
Oracle OpenStack leveraging MySQL Cluster and Docker

At Oracle Openworld this year, Oracle OpenStack Release 2 was announced. This Kilo based distribution included some new deployment features not see in other OpenStack distros including the use of Kolla, Docker and MySQL Cluster. The press release states “First commercially available OpenStack implementation completely packaged as Docker instances”.

Using Docker to containerize each component of services is a very convenient means of dev/test/prod management. Your single node developer environment gets HA automatically, you can easily deploy to two or more management …

[Read more]
Log Buffer #448: A Carnival of the Vanities for DBAs

This Log Buffer is dedicated to the top quality news from the arena of Oracle, SQL Server and MySQL.

Oracle:

  • We had a question on AskTom the other day, asking us to explain what a “latch” was.
  • Jonathan Lewis thinks column groups can be amazingly useful in helping the optimizer to generate good execution plans because of the way they supply better details about cardinality.
  • Today it’s all about developing software that makes access to your product easier.
[Read more]
Log Buffer #447: A Carnival of the Vanities for DBAs

 

This Log Buffer Edition covers the weekly blog posts of Oracle, SQL Server and MySQL.

Oracle:

  • An Index or Disaster, You Choose (It’s The End Of The World As We Know It).
  • SQL Monitoring in Oracle Database 12c.
  • RMAN Full Backup vs. Level 0 Incremental.
  • Auto optimizer stats after CTAS or direct loads in #Oracle 12c.
  • How to move …
[Read more]
Slides of HOL3348 on Getting started with MySQL Cluster

Hi!

Thanks everyone who attended the hands-on lab session on MySQL Cluster at Oracle OpenWorld today.

The following are the links for the slides, the HOL instructions, and the HOL extra instructions.

Will try to summarize the HOL session below.

Aim of the HOL was to help attendees to familiarize with MySQL Cluster. In particular, by:

  1. Learning the basics of MySQL Cluster Architecture
  2. Learning the basics of MySQL Cluster Configuration and Administration
  3. Learning how to start a new Cluster for evaluation purposes and how …
[Read more]
Multiple MysqL Routers setup for an application

The MySQL Router is a new building block for high availability solutions. MySQL Router simplifies development of high availability applications by intelligently routing queries to MySQL Servers for increased performance, robustness, and uptime. MySQL Router also helps in load balancing of read or write transactions to a database with support of multiple router connections to multiple clients.

There are various use cases where you can use multiple router connections.
- Write to a DB can be routed using one router and read can be happened by multiple router connections to have a better performance and stability
- If client and servers are in specific region , we can use multiple routers in the specific region
- Different warehouse can be handled by multiple routers considering the load.

These are few examples usecases. You can define your own usecase and check if it suites your environment. Also you …

[Read more]
MySQL Fabric Automation setup using python script

MySQL Fabric is an extensible framework for managing farms of MySQL Servers. Two primary features have been implemented - High Availability (HA) and scaling out using data sharding. These features can be used in isolation or in combination.

MySQL Fabric setup is a process in which you need to run different commands in a sequence and use the corresponding logs for future reference. This blog tells about an easy process to do the initial setup of a Fabric system using config file. You need to define the properties file as per your requirement and run a similar python script while will do the setup.
Note: This fabric setup script is basically for release 1.5.6 or less and it is tested in our test environment.

Precondition:
- Fabric manage Setup and manage start is already triggered.
- Database is created OR shard servers have database already present.

Properties …

[Read more]
Concurrent connections to a MySQL router from connector/python.

An application always needs support of concurrent connections to mysql servers and always requires high available system for a loss less data environment.

The MySQL Router is a new building block for high availability solutions. MySQL Router simplifies development of high availability applications by intelligently routing queries to MySQL Servers for increased performance, robustness, and uptime. MySQL Router definitely helps in supporting HA and concurrent connections to servers without any change in the application level coding irrespective of the servers in a simple topology or in a fabric distributed server.

In a practical application environment, the data is fetched from the read-only servers where data is written to read-write servers. So Router is pre-defined to support similar server setup. Also it is required connect to the available/next available server when there is failover and Provide proper logs to the …

[Read more]
Showing entries 31 to 40 of 1535
« 10 Newer Entries | 10 Older Entries »