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Database Administration & Monitoring

Daniel Westermann

PostgreSQL 14: Automatic hash and list partitioning?

By | Database Administration & Monitoring | No Comments

Declarative partitioning was introduced in PostgreSQL 10 and since then has improved quite much over the last releases. Today almost everything is there what you would expect from such a feature: You can partition by range, list and hash Attaching and detaching partitions Foreign keys Sub-partitioning Indexing and constrains on partitions Partition pruning What is missing, is the possibility to let PostgreSQL create partitions automatically. With this patch this will finally be possible for hash…

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Franck Pachot

Cross-cloud PMM: which TCP ports to open

By | AWS, Database Administration & Monitoring | No Comments

By Franck Pachot . I recently installed Percona Monitoring & Management on AWS (free tier) and here is how to monitor an instance on another cloud (OCI), in order to show which TCP port must be opened. PMM server I installed PMM from the AWS Marketplace, following those instructions: https://www.percona.com/doc/percona-monitoring-and-management/deploy/server/ami.html. I’ll not reproduce the instructions, just some screenshots I took during the install: I have opened the HTTPS port in order to access the console,…

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Daniel Westermann

The PostgreSQL shared/global catalog

By | Database Administration & Monitoring | No Comments

A PostgreSQL instance (or cluster) can contain many databases, three of them (template0, template1 and postgres) are there by default. Over the last years we trained many people on PostgreSQL Essentials and there have been mainly two points that needed more clarification when it comes to catalogs and the postgres default database: Does the postgres default database define the catalog and somehow is the master database? What exactly is in the global catalog? In this…

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Pascal Brand

How to declare TNS entries in Oracle Unified Directory (OUD)

By | Application integration & Middleware, Database Administration & Monitoring | No Comments

Using a LDAP server to store the TNS connection strings can be a single point of declarations for all client tools. Note that it can be a single point of failure too, thus, a High Availability LDAP configuration is recommended for production use. In my case, I was interested in using a LDAP as TNS connections repository for the WebLogic Domains Data-Source connections. I used a Oracle Unified Directory (OUD). The first step is to…

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Daniel Westermann

PostgreSQL 14: Allow CLUSTER, VACUUM FULL and REINDEX to change tablespace on the fly

By | Database Administration & Monitoring | No Comments

It is a common misunderstanding that VACUUM FULL saves you from running out of disk space if you already have space pressure. Running a VACUUM FULL temporarily requires at least double the space, as the table (and the indexes on the table) get completely re-written. PostgreSQL 14 will probably come with a solution for that as this patch introduces the possibility to move relations from one tablespace to another, when either CLUSTER, VACUUM FULL or…

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Stephane Biehler

Documentum DM_SYSOBJECT_E_NO_BROWSE_ACCESS No browse access for sysobject with ID

By | Database Administration & Monitoring | No Comments

When upgrading you may get this specific issues if you are trying to edit content or create new documents. We got it when creating a new document in a specific folder, D2 told us that the folder doesn’t exists and that it had no browse access. Foolishness! The folder does exist and all accesses are set properly so what happened? Here is the full log: Caused by: com.documentum.fc.client.DfIdNotFoundException: [DM_API_E_EXIST]error: “Folder specified by 0b010ba18005277d does not…

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Stephane Biehler

Documentum Administrator plugins installation not possible

By | Database Administration & Monitoring | No Comments

In some customer’s contexts you cannot install whatever you want. For policy reasons, or security. And documentum components really love to install client softwares to interact with them. In this blog we will discuss about the Documentum Administrator tool and the plugins it asks to install in order to gain full access to its functionalities. Documentum Administrator’s plugins DA requires at least 3 things to be installed on client machines in order to have the…

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Stephane Biehler

Documentum CTS reinstallation failing Null Pointer

By | Database Administration & Monitoring | No Comments

I went into an issue by a customer were I had to upgrade in place the CTS. When you have to upgrade a CTS on the same server you first have to uninstall the old version in order to install the new one. Unfortunately, the uninstallation didn’t end well and some folders or configuration haven’t been removed properly. Removing CTS manually If the uninstallation failed with the uninstaller, you will not be able to run…

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