Copy of environments
In evolution, dbSQWare constantly integrates new database engines, new releases and new features.
Follow, simplify backups and organize your bases
360-degree vision thanks to customized reporting and indicators
your own tools
Increase efficiency with a complete and consistent view of your entire database.
The TECHShow 2022 is today and it’s happening at the Aix-en-Provence Congress Center.
Michel Payan and Séverine Payan are waiting for you on the dbSQWare stand to present our multi-DBMS operating and maintenance software.
A good day in perspective, made of meetings and exchanges, multiple and varied.
Good event to all!
A statistic (on a table, a column / a set of columns or on an index) provides information on:
– the table (number of lines, average size of a line, number of blocks/page, density),
– the distribution of values for the column(s) (number of distinct values, number of duplicates, existence of null values, histogram of distribution of values),
– the composition of the index (depth, number of blocks, cluster ratio).
These statistics are used by the database optimizer to study the different execution plans that can be used for a query.
The optimizer (based on costs / CBO) chooses the best execution plan (least expensive) from the data calculated from these statistics on, in particular, the number of rows and blocks of data to be shuffled at each stage of these plans (access strategies).
Statistics are essential for the proper calculation of query execution plans. It is therefore essential that they are up to date to take into account changes to the data and therefore to the indexes, columns and tables.
Thanks to update statistics, the optimizer has reliable data to choose the best performing execution plan to serve data to applications.
Initially implemented exclusively in the Paris region, our software dbSQWare has since made its way.
It’s thanks to our users: their trust, loyalty and high standards.
The software is constantly evolving to meet customer needs.
This year, 6 patches have completed and enriched the 2022 version of dbSQWare.
The 7th will be released in a few days while waiting for the 2023 version…