Are you sure you haven't changed anything?
As I said: I don't access items in parallel. I've been using the API for a long time and haven't changed my upload process for quite a long time – these CONCURRENT_MODIFICATION errors have only occurred recently. I've always uploaded campaigns and ad groups in batches of 2000 items and have always been able to perform updates after receiving a successful creation response. I've never had problems creating ads in newly created ad groups. Regarding the 30-second waiting time: yesterday I uploaded 2000 campaigns and tried to update them after five minutes, but received a CONCURRENT_MODIFICATION error. Google Ads API Forum Advisor schrieb am Mittwoch, 22. Oktober 2025 um 20:59:25 UTC+2: > Hi, > > Thank you for reaching out to the Google Ads API support team. > > From the provided information, you are getting the " > *CONCURRENT_MODIFICATION* > <https://developers.google.com/google-ads/api/reference/rpc/v15/DatabaseErrorEnum.DatabaseError#concurrent_modification>" > > error. In general, the CONCURRENT_MODIFICATION error occurs due to multiple > processes that are trying to update the same entity at the same time. This > also includes updating the entity in Google Ads UI while updating via the > API as well. > > We recommend waiting for about 30 seconds, then retrying the request. That > being said, you’ll need to ensure that only one operation is performed > against an entity at each moment and slow down on the consolidated repeated > mutates against the same entity into a single request to avoid this issue > altogether. > > > Thanks, > > [image: Google Logo] Google Ads API Team > Feedback > How was our support today? > > [image: rating1] > <https://docs.google.com/forms/d/e/1FAIpQLSeRhIg5VeThVmbcD0c5DTWTDjmpJuSktN8vFelEL7_KV_Orbg/viewform?usp=pp_url&entry.141427034=1&entry.295079254=500Ht00001vRUikIAG> > > [image: rating2] > <https://docs.google.com/forms/d/e/1FAIpQLSeRhIg5VeThVmbcD0c5DTWTDjmpJuSktN8vFelEL7_KV_Orbg/viewform?usp=pp_url&entry.141427034=2&entry.295079254=500Ht00001vRUikIAG> > > [image: rating3] > <https://docs.google.com/forms/d/e/1FAIpQLSeRhIg5VeThVmbcD0c5DTWTDjmpJuSktN8vFelEL7_KV_Orbg/viewform?usp=pp_url&entry.141427034=3&entry.295079254=500Ht00001vRUikIAG> > > [image: rating4] > <https://docs.google.com/forms/d/e/1FAIpQLSeRhIg5VeThVmbcD0c5DTWTDjmpJuSktN8vFelEL7_KV_Orbg/viewform?usp=pp_url&entry.141427034=4&entry.295079254=500Ht00001vRUikIAG> > > [image: rating5] > <https://docs.google.com/forms/d/e/1FAIpQLSeRhIg5VeThVmbcD0c5DTWTDjmpJuSktN8vFelEL7_KV_Orbg/viewform?usp=pp_url&entry.141427034=5&entry.295079254=500Ht00001vRUikIAG> > [2025-10-22 18:58:45Z GMT] This message is in relation to case > "ref:!00D1U01174p.!500Ht01vRUik:ref" (ADR-00336236) > > > -- -- =~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~ Also find us on our blog: https://googleadsdeveloper.blogspot.com/ =~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~ You received this message because you are subscribed to the Google Groups "AdWords API and Google Ads API Forum" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/adwords-api?hl=en --- You received this message because you are subscribed to the Google Groups "Google Ads API and AdWords API Forum" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/d/msgid/adwords-api/5b4c983a-6050-47fc-8c1f-fe6ea1f58fb0n%40googlegroups.com.
