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IDS Forum

RE: TimeSeries update statistics recommendations [

Posted By: Mark Ashworth
Date: Thursday, 18 April 2013, at 10:54 a.m.

Good question. Update statistics on a table with a time series column will
not play a role in how TimeSeries operations/functions like Apply or
AggregateBy behave on the time series elements in the time series column.
It may help the optimizer with queries on the base table as with any other
table in your database.

If you are using the TimeSeries Virtual Tables (ie you have created tables
with TSCreateVirtualTab()), you can run update statistics on that table to
help the optimizer with queries on the virtual table. The statistics
gathered are the estimate of the number of rows and the estimate of the
number of pages in the virtual table (if the entire table were
materialized). Before TimeSeries.5.00 (which is available in 11.70) the
Virtual Table interface would scan the time series data to determine these
statistical values and this could be slow with large number of elements in
your time series columns. This was addressed 11.70. The TimeSeries Virtual
Table Interface will push predicate from the base table into the query so
you may see benefits from updating the statistics on the base table. You
can see these queries in the EXPLAIN output when querying the Virtual Table.
Not matter what mode/resolution/confidence level you use, it calculates the
same stats.

Its good to hear that you are planning moving to a later release. In 11.70,
Timeseries (as well as Spatial) are part of the server and you no longer
need to install a separate package. In the latest fixpack of 11.70, we
have many performance improvements to insert, delete and query operations.
In 12.10, we continued to improve performance on all fronts and added
significant new capabilities including ER, Rolling Window, reduced logging
and the fast loader support to name a few.

In the area of table statistics gathering has dramatically faster for a
virtual table. Also, a feature went in to SQL and Timeseries to improve
table joins between a TimeSeries Virtual Table and other tables.. In
11.70.xC7 you can take advantage of this by giving a query hint to improve
join performance. In 12.10.xC1, the query hint is no longer necessary. In
12.10, SQL now pushes more predicates down to the TimeSeries Virtual Table
interface which helps to make queries materialize fewer rows which make many
queries execute faster.

I hope this helps.

Mark Ashworth
IBM Informix Extensibility Architect

-----Original Message-----
From: [] On Behalf Of LUC
Sent: April 17, 2013 9:38 AM
Subject: [Bulk] TimeSeries update statistics recommendations [30086]


My customer is running IDS 10.00.FC8 with TimeSeries.4.01.FC7X3.
The instance contains a database that is mainly used for an application
using the TimeSeries software.
My question: does it make sense to run update statistics against the
timeseries tables and if so, what would be the preferred

I'm aware this is an older IDS version, we are planning to upgrade to IDS
11.70 or perhaps even IDS 12.10 in the near future, so any input related to
the subject for these new releases would also be welcome

Kind regards,
Luc van Gastel

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