Marko Sutic's Database Blog
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RMAN restore fails with RMAN-06023 but there are backups available | Marko Sutic's Database Blog
I must admit - today I learned new thing about RMAN restore and this is good enough reason for a blog post. Part of my daily tasks is to perform RMAN backup and recovery scenarios in my test environm...
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Oracle Scheduler External Jobs and Credentials | Marko Sutic's Database Blog
At the end of that post I wrote: When dbms_scheduler is executing external (operating system) jobs it is using lowly privileged user and group for your platform. In my environment (OEL 5.8) this is “n...
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Marko Sutic's Database Blog Just to mention, this is not proper production test. Before considering this setup for the production it would be great to put cluster under proper load, simulate slow IO...
Msutic.blogspot.com news digest
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3 years
ProxySQL - Throttle for MySQL queries
ProxySQL is a great high availability and load balancing solution and it is mostly used for such purposes. But ProxySQL offers much more.
One of the nice features is the throttling mechanism for queries to the backends.
Imagine you have a very active system and applications are executing queries at very high rate, which is not so unusual nowadays. If just one of the queries slows down you could easily end up with many active sessions running the same query. Just one... -
6 years
Galera Cluster Schema Changes, Row Based Replication and Data Inconsistency
Galera Cluster is a virtually synchronous multi-master replication plug-in. When using Galera Cluster application can write to any node and transactions are then applied to all serves via row-based replication events.
This is built-in Mysql row-based replication which supports replication with differing table definitions between Master and Slave.... -
6 years
Global variable wsrep_OSU_method=RSU ignored on MariaDB Galera Cluster 10.0.32
Galera Cluster is great solution for application clustering but it has some limitations. One of the most critical limitations is how Galera Cluster performs model changes.
From Galera Cluster documentation:http://galeracluster.com/documentation-webpages/clusterstallonalter.html... -
6 years
HASH GROUP BY not used when using more that 354 aggregate functions
Few days ago we had performance problem with one of our main application views. This was complex view that used a lot of aggregate function. Functions were used to transpose rows into columns.
When developer added few more aggregate functions for a new columns, query performance changed significantly and we had performance problem....
Domain history
| Web host: | Google LLC |
| Registrar: | MarkMonitor Inc. |
| Registrant: | Google LLC |
| Updated: | August 02, 2024 |
| Expires: | July 31, 2025 |
| Created: | July 31, 2000 |
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