Introduction Apache ZooKeeper is open-source software that enables resilient and highly reliable distributed coordination. It is commonly used in distributed systems to manage configuration information, naming services, distributed synchronization, quorum,… Read more »
Introduction Clickhouse is a column store database developed by Yandex used for data analytics. In this article I will talk about setting up a distributed fault tolerant Clickhouse cluster. If… Read more »
Introduction ClickHouse is an open source, column-oriented (like MariaDB Columnstore) analytics database created by Yandex for OLAP and big data use cases. ClickHouse’s support for real-time query processing makes it… Read more »
Database In-Memory is an option to Enterprise Edition. Database In-Memory now has a new “Base Level” feature. This allows the use of In-Memory with up to a 16GB column store… Read more »
SYMPTOMS The alert message looks like EM Event: Warning:TEST_PDB1 – Total global cache block lost is 15. Host=db-test01.local Target type=Database Instance Target name=TEST_PDB1 Categories=Error Message=Total global cache block lost is… Read more »
This post describes the 5 main differences between ATP-D & ATP-S and the 5 main ATP-D physical characteristics and constraints. Autonomous Transaction Processing Dedicated (ATP-D) is a deployment choice that… Read more »
When we go to delete a lun that is no longer mapped, we may get this error sdXX: couldn’t get asymmetric access stateAfter unmapping the LUN from the SAN storage… Read more »
The Web Server is a crucial part of web-based applications. Apache Web Server is often placed at the edge of the network hence it becomes one of the most vulnerable… Read more »
To give customers more flexibility and time to take advantage of the latest features offered with Oracle VM 3.4, Oracle has extended the Premier Support end date for Oracle VM… Read more »
Oracle has finally certified Oracle Database solutions for KVM products.To have less problems with the Oracle auditor it is advisable to use their (free) solution called Oracle Linux Virtualization. Oracle Linux… Read more »