The Issue: I'm working on a big table that consists about 37mln rows. Data include measurements of many devices made in certain time e.g. '2013-09-24 10:45:50'. Each day all of those devices are ...
In clustered index, we have root, intermediate and leaf level pages. Every page has few records where indicating range of pages from level below. How SQL check whether some index key belong to ...
My source data comes from multiple OLTP databases where the primary key is an identitiy column. We anticipate adding data centers and/or splitting the databases by product. Currently i have one system ...
I have fairly large fact table (2 billion records, approx 120 GB). This table is not partitioned and the queries are very slow to respond. I am planning to partition the table and indexes. The table ...
Does a cluster index provide more benefits than pre-sorting the load file and creating non-cluster index?
Informix 11.70.TC4DE: CREATE TABLE cluster_tbl ( fk_id INT, data CHAR(2048) ); LOAD FROM "presorted.ld" INSERT INTO cluster_tbl; CREATE UNIQUE CLUSTER INDEX cl_idx ON cluster_tbl(fk_id); ...
When designing a SQL server data schema and the subsequent queries, sprocs, views, etc. does the notion of a clustered index and order of data on disk make any sense to consider for DB designs made ...