dat329 microsoft sql server always-on technologies...
Post on 08-Jun-2018
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Design
• Logical DB
design
optimization
(normalization
,
index/primary
key choice
etc.)
Build
• Query
tuning
• Database
physical
optimization
(index etc.)
Test &
Deployment
• Database
physical
optimization
(index,
database
physical
design, etc.)
• System
resource
optimization
Operate
• Database &
system
monitoring
• Resource
optimization
SQL-OS (Schedulers, Buffer Pool, Memory
Management, Synchronization Primitives, …)
Language Processing (Parse/Bind/View Expansion)
Statement/Batch
Execution
Plan Cache Management
Storage Engine (Access Methods, Database Page
Cache, Locking, Transactions, …)
Query Optimization
(Plan Generation, Index
Selection, Join Ordering,
Statistics, Costing) Query Execution
(Query Operators,
Memory Grants,
Parallelism)
Utilitie
s (DB
CC
,
Back
up
/ Resto
re, B
CP, …
) M
eta
data
, Typ
e s
yst
em
, Exp
ress
ion
Serv
ices
You
are
here
OR is similar to UNION
Be sure to test this thoroughly as your queries are semantically different when you change from OR to UNION.
Table1 Table2
SARG1
Join Col PK
SARG2
Join Col FK
Do you already have
individual indexes on
each and all of these
columns?
Foreign Key???
http://blogs.msdn.com/sqlqueryprocessing/
http://technet.microsoft.com/en-us/library/ms188722.aspx
http://technet.microsoft.com/en-us/magazine/cc434693.aspx
Page 32
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