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Back to technology: Is it effective to place Oracle REDO on SSD?

Ever since I was asked to improve the throughput of an actual general ledger posting job involving Oracle in December 1993 on some hardware where solid state disk (SSD) was available (at high cost relative to “spinning rust” or hard disk drives [HDD]), I have been trying to explain the overall advantage of placing different types of the different Oracle storage selectively on SSD.

When FLASH SSD arrived on the scene, studies quickly arose that writing to FLASH SSD is often not as fast as writing to disk drives dedicated to receiving those writes.

Today I’ll try to explain why I don’t care.

While there was some advantage to writing to SSD in my tests (which were to RAM based SSD on a VAX), the write speed to online REDO was not a significant part of the advantage of placing online REDO on SSD.