Every time I work on database migrations with GoldenGate, I have the same talks with application teams about missing primary keys. Especially when it comes to LOB replication with GoldenGate. In a previous blog, I wrote about how to interpret the DBA_GOLDENGATE_NOT_UNIQUE view, which lists tables with no primary key or non-null unique indexes. There are two main groups of…
GoldenGate is a powerful replication tool, but it is so versatile that you should always check whether what you intend to do is supported or not. Oracle provides a few interesting scripts and views to check your environments before attempting a replication with GoldenGate, and I wanted to write about the DBA_GOLDENGATE_NOT_UNIQUE view. Before explaining what this view contains and…
26ai update: This article was originally written for 23ai. But not much changes when setting up GoldenGate 26ai. Just adapt the responseFileVersion when doing the silent installation, and that’s it ! As instructed in this other blog, use oracle.install.responseFileVersion=/oracle/install/rspfmt_ogginstall_response_schema_v26_1_0 Automating Oracle installations can sometimes be daunting, given the long list of parameters available. We’ll compare both graphic and silent installations…
The client’s environment includes two SQL Server instances (I1 and I2). One of the databases, D1 (on I1), is replicated to I2 via transactional replication. Additionally, the tables in this database are partitioned. The largest table (which is the one of interest) is approximately 350 GB in size and contains around 800 million rows. This table represents transactions. The client…
Introduction This blog is a follow-up to my previous post: MariaDB Repair Replication through DB Restore. A client recently experienced a crash on the database slave in their MariaDB cluster within their QA environment. I successfully restored the database using the procedure detailed in the earlier blog. However, a few weeks later, the database slave crashed again, this time in…
Introduction Maintaining database replication integrity is paramount for businesses relying on databases. Replication ensures that changes made on the master database are reliably propagated to replica databases, guaranteeing data consistency and availability across the system. In this comprehensive guide, we’ll dive into the process of restoring a MariaDB database and repairing replication, in the context of a “last hope” solution.These…
In this blog-post I will discuss about my first test with Striim. Striim is a data integration platform which can ingest real-time data from a variety of sources (SQL Server, Oracle, Kafka, Hadoop…) and quickly deliver it to Cloud systems or even to an on-premise infrastructure. The goal today will be to do the creation of my schema data in…
Although PostgreSQL 10 integrate native logical replication (have a look here or here), it is always interesting to be aware of alternative solutions to the available in-core features. One of those is called pglogical. It’s a Postgres extension developed by 2ndQuadrant, major contributor to PostgreSQL development. The goal of this blog post is to discover how to install pglogical and…
In this blog, I will talk about the WebLogic Embedded LDAP. This LDAP is created by default on all AdminServers and Managed Servers of any WebLogic installation. The AdminServer always contains the Primary Embedded LDAP and all other Servers are synchronized with this one. This Embedded LDAP is the default security provider database for the WebLogic Authentication, Authorization, Credential Mapping and…
In December 2015, my colleague Vincent did a test with additional column with Oracle GoldenGate 12.2. Hervé & Vincent asked me to do the same test with Attunity Replicate between Oracle and SQL Server. For the story, Hervé does the test with a previous version here. I create a task and select the Scott schema. I run the replication On…
In this post I’d like to share what we did for a customer who had the following requirements: Use Oracle GoldenGate Upgrade an Oracle 10.2.0.4 database running on Solaris 10 SPARC to Oracle 12.1.0.2 running on Exadata Keep the downtime as small as possible Minimize the impact on the production database as much as possible I will not describe why…
After the good article “A short glance at Attunity replicate” from Franck Pachot, I will continue to explain our test on Attunity Replicate with datatype and how this tool do the mapping between Oracle and SQL Server for numeric datatypes. Introduction The first step is to find the mapping between Oracle and SQL Server. I summarize this mapping in this…
