Faster SQL Queries, 3 tips
by Mountain Computers Inc., Publication Date: Monday, October 21, 2019
View Count: 363, Keywords: SQL Queries, Faster, 3 rules, Hashtags: #SQLQueries #Faster #3rules
The following I was just reading online from developer.com news (see below at the link and text below that), and wanted to comment; #1 true, #2 no so sure, #3 sort of makes sense.
For me, my rule of 3 is easier:
1. no more than three indexes per table... max... now if JSON, keep bloat out of your nest...
2. use strict data typing and strict camel code in SQL queries. don't let someone turn off options explicit per se.
3. use native connections (e.g. OLE-DB) ... 1-2-4-8 seconds or less to pull 1mil records versus 45 seconds or more using other methods. use raw connections for good reason; hit the database once, not multiple times, and keep your connections limited, closed when done, and watch your query performance...
more to come...
For building faster SQL queries, follow these hints.
- 1. Use Smaller batches
Always try to delete data or update data in smaller batches. If you
try to delete thousands of records in one go, it will impact
performance. If you try to update large batches of data in one go, it
will also negatively impact performance and speed. Break these up in
- Stop being trigger-happy!
By using triggers, you may end up locking more than one table at the
same time, until the trigger has completed its work. Sometimes a trigger
is unavoidable, but only sometimes. Rather, try to split the logic so
that only limited resources are locked at a given time.
- Avoid nesting views
As the name implies, nested views are views inside existing views.
The more nested a view becomes, the more data has to be returned for a
single query and this can really cause your whole database to lag quite
quickly. Do not nest views.
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