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Category Archives: Database In-Memory
My favorite marquee feature in Oracle Database 12c is Database In-Memory. With the introduction of Database In-Memory in 126.96.36.199, data can now be populated into memory both in a row format (the buffer cache) and a new in-memory optimized column … Continue reading
Today Oracle Database 12c Release 2 became available for download on Oracle.com for both Linux & SPARC. So anyone who wasn’t ready to try 12.2 in the Cloud can now play around with it, in the comfort of their own environment.
With each new release of the Oracle Database come fundamental architectural changes, driven by new technologies and user requirements. This has never been more evident than with Oracle Database 12c, which has 3 marquee features: Continue reading
If you are on Exadata or taking advantage of Database In-Memory it’s possible your queries will benefit for the automatically created and maintained Storage Indexes.
But what exactly are Storage Indexes and why don’t I always see a benefit from them?
Let me start by describing what Storage Indexes are in relation to Database In-Memory but remember they behavior in exactly the same way on the Exadata storage cell.
A Storage Index keeps track of minimum and maximum values for each column in an In-Memory Compression Unit (IMCU) or 1MB chunk on the Exadata storage cells. When a query specifies a WHERE clause predicate, the In-Memory Storage Index on the referenced column(s) is examined to determine if any entries with the specified value exist. Continue reading