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Comonly used Tags12c Audio Autonomous beginners Big Data birthday cursor_sharing Database DBA DBMS_XPLAN Docker events Exadata Execution Plans Github Hints histograms In-Memory IoT JSON Multitenant My_Activities OOW optimizer Oracle Oracle Database 12c Partitioning Performance REST Security Sharding SQL Monitor statistics syntax top_tip UKOUG Usergroup video
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Category Archives: AskTom
Oracle OpenWorld started yesterday and San Francisco is just buzzing with Oracle folks and the excitement generated by the new Oracle Autonomous Database announcements made by Larry Ellison during last night’s keynote! If you are interested in more information on the Autonomous Database … Continue reading
Yesterday saw Oracle complete the release of Oracle database 12c Release 2 when the software became available for download on Oracle.com for both Linux & SPARC. Earlier this year I was lucky enough to have an opportunity to grab a … 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
I got a great follow up question to my earlier blog on Online Statistics Gathering; that I thought might be of interest to other and worthy of a short post of its own.
The question related to sample size used to gather histograms on a table that originally had its statistics gathered via a direct path load operation.
Let’s look at any example: Continue reading
A little over a year ago Connor McDonald and Chris Saxon took over answering questions posted on AskTom, which covers many topics related to building applications on top of the Oracle Database. Connor and Chris have done an amazing job of keeping up with the constant influx of questions, … Continue reading