Ensuring the database is up to PAR (Performance, Availability, Recoverability) has long been the focus of database administrators everywhere. Although this is still true, it is no longer an accurate depiction of the full scope of a DBA’s responsibilities. Modern businesses operate as online data driven machines. The demand and value placed on data, coupled with the current cyber security concerns means that database administrators have to redefine their focus. This blog is intended for DBA’s looking to a add value in a modern IT world. I will mention technology implementations specific to Oracle databases, however the concepts mentioned in this blog post are applicable to any database platform.
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Disabling Transparent HugePages On RHEL 7
Transparent HugePages (THP) memory is different from standard HugePages memory because the kernel thread allocates memory dynamically during runtime. Standard HugePages memory is pre-allocated at startup, and does not change during runtime. This dynamic memory allocation of THP can cause memory allocation delays during runtime. To avoid performance issues, Oracle recommends that you disable THP on all Oracle Database servers. Oracle recommends that you instead use standard HugePages for enhanced performance.
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Flushing Shared Pool In Production DB
The Oracle Database Server is made up of two main components; the instance and database. The instance consists of memory structures and background processes, whiles the database is a collection of physical database files. If we look at the Oracle Database architecture we can see that there is an organized layout for the memory structures, in which we can find the main memory structure and it’s sub-memory structures.
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