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Operation systems

David Hueber

Linux: Disks diagnostic using smartctl

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Facing disk issues such as corruption or block defect is thankfully not happening frequently. However when it does, the diagnose may look sometimes like a real struggle. This is forgetting that disks integrate since years the S.M.A.R.T technology. Good point, it can easily be adressed in Linux command line through smartctl What is S.M.A.R.T. exactly? S.M.A.R.T., which stands for Self-Monitoring, Analysis and Reporting Technology (also called SMART), is a monitoring system for and integrated in…

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How to add new tables in existing Oracle GoldenGate replication

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Introduction Often some times after having setting up a replication environment, it is needed to add additional tables to the replication, where the additional tables have dependency with the current replicated tables. This tasks must be implemented without disturbing the current replication environment Explanation In this example the below tables from schema G001 on Database PROD1 will be added, to an existing Replication from PROD1 to REP CFG_ADV_COND CFG_NARRATIVE_TEMPLATE CFG_REG_REPORT_RULES CMN_LOOKUP CMN_USER_LOGIN Stop the replication…

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David Hueber

Using IOzone for Linux disk performance analysis

By | Operation systems | 6 Comments

Who never had to measure the disk performances on a system?

Speaking about Linux performance monitoring includes a significant part on disk performances. If you are facing applications or databases running slower than expected or than on other environments, you may take a look on the I/O performances.
This blog aims to provide to introduction to a pretty interesting tool, iozone…

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David Hueber

Linux: easing the process and performance monitoring with htop

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I’m pretty sure that most of you already struggled with some low performance systems. In order to analyse such cases several tools and utilities, like top, nmon, fuse or lsof are available under Linux. However trying to dig in processes analysis and looking for files and processes relations may be quite painful.

To get started with performance checks and analysis, a interesting utility is available: htop

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