Oracle Team

Replicating specific tables in PostgreSQL 10 Beta with mimeo

By Mouhamadou Diaw In this blog I am going to test the extension mimeo with PostgreSQL 10 beta. Mimeo is a replication extension for copying specific tables in one of several specialized ways from any number of source databases to(…)

ODA X6 2S 2M 2L HA: Small Medium Large and High Availability

By Franck Pachot . There are 4 models of Oracle Database Appliance with the new ODA X6 which is for the moment the latest ODA hardware version. One is similar to the(…)

OUD 11.1.2.3 – How to recover a lost entry in a replicated OUD environment

By William Sescu . By accident, it could happen that someone dropped an OUD entry in your replicated environment and of course, the entry is deleted on all replicas as well. And besides that, you got no logical ldif(…)

Postgres vs. Oracle access paths VI – Index Scan

By Franck Pachot . In the previous post my queries were still reading the indexed column only, from a table which had no modifications since the last vacuum, and then didn't need to read table pages:(…)

Postgres vs. Oracle access paths V – FIRST ROWS and MIN/MAX

By Franck Pachot . We have seen how an index can help to avoid a sorting operation in the previous post. This avoids a blocking operation: the startup cost is minimal and the first rows can(…)

MariaDB – Speed up your logical MariaDB backups with mydumper

By William Sescu Per default, MariaDB is shipped with a utility called mysqldump for logical backups. For more information, please take a look at the following link. https://mariadb.com/kb/en/mariadb/mysqldump/ The mysqldump has advantages, e.g. it is easy to use and(…)

Postgres vs. Oracle access paths IV – Order By and Index

By Franck Pachot . I realize that I'm talking about indexes in Oracle and Postgres, and didn't mention yet the best website you can find about indexes, with concepts and examples for all RDBMS: http://use-the-index-luke.com. You(…)

Exadata Capacity on Demand and Elastic Rack

By Franck Pachot . Since X4 we can do Capacity on Demand on Exadata: disable some CPU cores to lower cost of Oracle Database licenses. Depending on the models, and the configuration, there are different minimums and here is a(…)

Postgres vs. Oracle access paths III – Partial Index

By Franck Pachot . In the previous post I said that an Index Only Access needs to find all rows in the index. Here is a case where, with similar data, Postgres can find all rows(…)

Postgres vs. Oracle access paths II – Index Only Scan

By Franck Pachot . In the previous post I've explained a sequential scan by accident: my query needed only one column which was indexed, and I expected to read the index rather than the table. And(…)