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Setting options
Resources that can be
managed
CHAPTER 10
For example, you may wish to prevent a single connection from taking too
much of the available memory or CPU resources, so that one connection does
not slow down other users of the database.
Adaptive Server IQ provides a set of database options that the DBA can use to
control resources. These options are called resource governors.
You can set database options using the
following syntax:
SET [ TEMPORARY ] OPTION
... [ userid . | PUBLIC. ] option-name = [ option-value ]
For reference information about options, see "Database Options" in Adaptive
Server IQ Reference Manual. For information on the
see Adaptive Server IQ Reference Manual.
The following options can be used to manage resources. See Chapter 12,
"Managing System Resources" or see the Adaptive Server IQ Reference
Manual for more information on these options.
•
AGGREGATION_CUTOFF
Server IQ uses a more efficient internal storage type to do calculations on
or
numeric expressions.
SUM
AVG
•
CURSOR_WINDOW_ROWS
buffer.
•
LOAD_MEMORY_MB
memory that subsequent load operations can use.
•
MAIN_CACHE_MEMORY_MB
IQ Store.
•
MAX_CARTESIAN_RESULT
query containing a cartesian join.
•
MAX_IQ_THREADS_PER_CONNECTION
processing threads available to a connection for use in IQ operations.
•
TEMP_CACHE_MEMORY_MB
Temporary Store.
•
JOIN_OPTIMIZATION
option is on (default), Adaptive Server IQ optimizes the join order to
reduce the size of intermediate results and sorts, and to balance the system
load.
The following options affect the database engine, but have limited impact on
Adaptive Server IQ:
Managing User IDs and Permissions
statement, which has the
SET OPTION
SET OPTION
Sets the precision level at which Adaptive
Defines the number of cursor rows to
Sets an upper bound for the amount of heap
Sets the size of the cache for the main
Limits the number of result rows from a
Sets the number of
Sets the size of the cache for the IQ
Enables optimization of join order. When this
statement,
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