We know how difficult managing a database can be. Luckily, we’re here to share our experiences troubleshooting, building, improving, and operating them. Browse blogs below, and feel free to comment!
The Oracle error ORA-04031: unable to allocate nn bytes of shared memory is telling us that Oracle tried to allocate a specific amount of memory for a process and it was unable to do so. I see this more often with legacy or very large and complex ETL processes. The...
The SQL Server Migration Assistant (SSMA) is a tool for transitioning from other platforms like Db2 to Microsoft SQL Server. A reference guide for the SSMA can be found in Microsoft's SQL Docs. This article addresses the issue of failed migrations without warnings or...
This post has been updated from the original content here. When getting an ORA-12560 for an Oracle database on windows, there are a couple of things we should check before doing anything else. The error is telling us that we are trying to connect to the wrong...
Db2's Database Partitioning Feature (DPF) allows a single Db2 instance to span multiple physical servers — allowing a single Db2 database to scale out to sizes well beyond what is possible on a single physical server. To manage a DPF environment, Db2 needs to be able...
This post has been updated from the original content here. The ORA-00257 error is a very common Oracle database error. The error is basically trying to tell us that we have run out of logical or physical space on our ASM diskgroup, mount, local disk, or...
Every environment is configured differently; however, we have all experienced alerts being triggered due to unfavorable performance. Oftentimes, before our root cause analysis begins, the issue has resolved itself and/or someone may have rebooted. Although current...
In this blog, I will cover some typical TNS errors that we run across as an Oracle DBA and how to go about troubleshooting the errors. First of all, when you encounter a TNS error you need to understand that it relates to the network communication between a client...
If within a MySQL instance a schema name such as "#mysql#lost+found" or "#lost+found" is listed when the "show schemas" or “show databases” command is run, it's not a true schema but will appear when MySQL is installed in a root directory on a Linux server. At the...
There's often confusion over why MySQL users are created with a host of localhost in addition to a user created with wildcard, %, for their host. create user 'some_user'@'localhost' identified by 'some_password_here'; create user 'some_user'@'%' identified by...
Because even DBAs need a little holiday humor, and we all know how SQL query plans can go.