CUBRID Q&A http://www.cubrid.org/?mid=questions CUBRID Q&A en Fri, 21 Oct 2011 02:37:10 -0800 Wed, 20 Mar 2013 22:07:09 -0800 XpressEngine 1.4.4.1 How to speed up index scans? sqlcopter http://www.cubrid.org/questions/236479 http://www.cubrid.org/questions/236479 How can I speed up my indexes? I see there is index covering which is supported http://www.cubrid.org/cubrid_covering_index, are there any other index optimizations?

]]> Tue, 08 Nov 2011 06:25:54 -0800 indexing optimization 1 Does CUBRID use ISAM for indexing data? andreyij http://www.cubrid.org/questions/237177 http://www.cubrid.org/questions/237177 MySQL has a storage engine that uses ISAM for storing indexes. Does CUBRID support this method? If not, how does CUBRID handle indexing?

]]> Thu, 10 Nov 2011 23:58:36 -0800 indexing 1 Does Cubrid keep all the pages of a (heavily used) index in memory? sqlcopter http://www.cubrid.org/questions/236940 http://www.cubrid.org/questions/236940 Suppose I heavily use a certain index, and there is enough RAM available on my machine. When scanning for the first time each page is read into memory. After that, are they discarded, or kept? Is there a configuration parameter for this?

]]> Thu, 10 Nov 2011 00:17:48 -0800 memory index indexing 1 What's the difference between "USING INDEX" and "USING INDEX (+)"? sqlcopter http://www.cubrid.org/questions/236676 http://www.cubrid.org/questions/236676 In the documentation at http://www.cubrid.org/manual/840/en/USING%20INDEX%20Clause it says that the (+) actually forces the index to be used. What about when writing USING INDEX without the (+)? Is the index still 100% used?

]]> Wed, 09 Nov 2011 01:28:25 -0800 indexing 1 Does the hint "USE_DESC_IDX" applies to multiple indexes at the same time? sqlcopter http://www.cubrid.org/questions/236708 http://www.cubrid.org/questions/236708 The page in manual http://www.cubrid.org/manual/840/en/Index%20Scan%20in%20Descending%20Order doesn't mention anything about multiple indexes. Suppose I join two tables, and I have an index on a column from each of the tables. Then is this hint applied to both index scans? Or can it be applied only on one of the scans, and not on the other?

select /*+ USE_DESC_IDX */ ... from t1,t2 where ... using index index1(+), index2(+)

In this query, do both index scans are descending? Can I make one descending and one normal?

]]> Wed, 09 Nov 2011 04:33:34 -0800 index indexing 1