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Assorted Rants Tagged ‘SQL’, page 1:

OLTP Database Optimization 102 – DIY Heterogeneous Replication (Part II)

Quote: “The point of Super-Replica is that it is a replica Slave DB which is larger than original Master DB”
Another Quote: “this “don’t write some HISTORICAL data to Master DB” approach can easily allow to reduce the load on the Master OLTP DB by a factor of 2x-3x”

OLTP Optimization 102: DYI Heterogeneous Replication. Part I (Basics)

Quote: “there are still several Big Fat Reasons™ to use DIY replicas”
Another Quote: “With the Replication Messages described above, it is ok to apply Replication Messages to Slave DB which is newer than exactly necessary.”

DB Execution Plans for C++/Java Developers, and for anybody who has read Knuth

Quote: “If I was a compiler-with-ability-to-create-indexes-as-I-need-it – what would I do to make The Ideal Execution Plan™ for this request?”
Another Quote: “When we have that ideal-execution-plan – we still need to convince our SQL compiler to use it”

OLTP DB Optimizations 101 – Thinking in Terms of Execution Plans

Quote: “to realize how our queries are working – we need to start thinking in terms of so-called “execution plans”.”
Another Quote: “it can be faster to use Table Scan rather than Index-Scan+fetch over such a low-selectivity index”

Representing The Same Data Structure in SQL and NoSQL (from Classical Codd-style SQL to Key-Value NoSQL with SQL-with-XML and Structured NoSQL in between)

Quote: “while duplication MAY indeed improve performance – undue duplication also MAY hit performance pretty badly”
Another Quote: “NoSQL will usually call for another denormalisation on top of what we’ve described above for SQL-with-XML.”