Hello!
Currently our company have some Interbase XE database servers. This summer we needed to create another database server. Unfortunatelly, Embarcadero ddn't provide Interbase XE licence, only Interbase XE7. When we bought and installed this version, we've faced huge performance troubles with our buisness operations.
After lot of researches, we found that query plans on same SQL queries are different on XE and XE7. For some reason XE7 tried to use two indices when XE used one.
For example,
*** SM INDEX (TBL_STORES_AND_MOVES_STORE_ST,TBL_STORES_AND_MOVES_CAT_ST) *** - XE7
*** SM INDEX (TBL_STORES_AND_MOVES_CAT_ST) *** - XE
Because of this issue, some queries on Interbase XE7 works 10-20 times longer then on Interbase XE, and this is impossible for us.
May we have some licence downgrade from Interbase XE7 to Interbase XE?