# RABNSIZE from 3 to 4 BYTES STRATEGY **URL:** \ **Category:** Forum\ **Tags:** Adabas-Natural, Adabas, Adabas-on-Mainframes, Adabas-Utilities-on-Mainframes\ **Created:** [August 5, 2008, 1:38pm UTC](https://techcommunity.softwareag.com/t/rabnsize-from-3-to-4-bytes-strategy/78686 "2008-08-05T13:38:44Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![ventus](https://avatars.discourse-cdn.com/v4/letter/v/f17d59/32.png) [@ventus](https://techcommunity.softwareag.com/u/ventus)\ **Post date:** [August 5, 2008, 1:38pm UTC](https://techcommunity.softwareag.com/t/rabnsize-from-3-to-4-bytes-strategy/78686/1 "2008-08-05T13:38:44Z")
Hi. I want to do this: Restore prod backup into #temp-db ADAORD RESTRUCTEREF a bunch of files (single user or multi user - not sure yet - any benefits of parallel processing files?) ADADEF DEFINE #temp-db with RABNSIZE 4 Increase #temp-db ADAORD STORE into #temp-db (single user or multi user - not sure yet - any benefits of parallel processing files?) TAKE PLOGS from prod DB and apply them against #temp-db Rename prod-db to old-db Rename #temp-db to prod-db SO MY QUESTIONS IS THIS: Presumably applying PLOG requires that ISNs do not change during ADAORD RESTRUC… and ADAORD STORE - DOES THIS PROCESS RETAIN THE ISNS??? ALWAYS??? IF ONLY SOMETIMES DOES IT DEPEND ON SETTING OF USERISN AT THE FILE LEVEL? Is this a recognised/accepted strategy??? It will take 48 hours to execute and as 24/7 (mostly) I can;t be out for 2 days. I plan to do first ADAORD on weekend 1 and second ADAORD during week and apply PLOGs through the week and on second weekend flip to new db. Thanks! D.G. A DBA ---
**Author:** ![system](https://global.discourse-cdn.com/techcommunity/original/3X/c/d/cd19967bb605d28a72d77eb83a1cae22f3df2eb8.svg) [@system](https://techcommunity.softwareag.com/u/system)\ **Post date:** [April 2, 2021, 2:50pm UTC](https://techcommunity.softwareag.com/t/rabnsize-from-3-to-4-bytes-strategy/78686/2 "2021-04-02T14:50:42Z")