onstat -g aqt command: Print data mart and
accelerated query table information
Use the onstat -g aqt command to display
information about the data marts and the associated accelerated query
tables (AQTs).
Syntax:
Example output
If you use the AQT name for the optional aqt_name parameter,
the command prints information about the specific AQT.
Output description
The AQTs are grouped
by the data mart that they belong to. The groups are sorted by accelerator
name, and then by data mart name. Within the data mart groups, the
AQTs are sorted in the following order: Fact table tabid (FactTab),
number of tables (#tab), and AQT name.
The
output comes from the entries in the dictionary cache that refer to
the AQTs of the data marts. The output is shown only if the AQTs have
been loaded into the dictionary cache, which normally occurs when
a query is being matched against the AQTs.
Before the server
attempts to match a query against the AQTs, the AQTs do not have any
entries in the dictionary cache. The onstat -g aqt command
will not show any entries in the output. When the dictionary cache
is initialized during the database server startup, the columns #matched and address get
new values.
The onstat -g aqt command prints
the following information:
mart
The name of the data mart
accelerator
The name of the accelerator instance
last load
The time stamp for when the data mart was last loaded
AQT name
The unique system-generated name of the AQT
FactTab
The tabid of the fact table for the AQT
#tab
The number of tables that are part of the AQT
#matched
The counter for query matches that have occurred for the AQT
address
The internal database server memory address for the AQT
The onstat -g aqtaqt_namecommand
prints the following information:
AQT
The unique system-generated name of the AQT
database
The name of the database to which the AQT belongs
AQT tabid
The tabid for the entry that constitutes the AQT in the systables system
catalog table of the database server.
Fact table
The tabid of the fact table of the AQT
Number of times matched
The counter for query matches that have occurred for the AQT
The information about the AQT is followed by a textual
representation of the star schema of the data mart. The textual representation
shows how the columns of the tables are related to each other in the
star join.
For information about the Informix®
Warehouse Accelerator, see
the IBM®
Informix Warehouse Accelerator Administration
Guide.