# Natural error code 16: Unable to open buffer pool **URL:** \ **Category:** Forum\ **Tags:** Adabas-Natural, Adabas, Natural\ **Created:** [March 29, 2023, 8:31am UTC](https://techcommunity.softwareag.com/t/natural-error-code-16-unable-to-open-buffer-pool/276437 "2023-03-29T08:31:52Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![Yong\_Sam\_Loh](https://avatars.discourse-cdn.com/v4/letter/y/b4bc9f/32.png) [@Yong\_Sam\_Loh](https://techcommunity.softwareag.com/u/Yong_Sam_Loh)\ **Post date:** [March 29, 2023, 8:31am UTC](https://techcommunity.softwareag.com/t/natural-error-code-16-unable-to-open-buffer-pool/276437/1 "2023-03-29T08:31:52Z")
#### What product/components do you use and which version/fix level are you on? Windows Natural ver 6.3 #### Is your question related to the free trial, or to a production (customer) instance? production #### What are you trying to achieve? Please describe it in detail. Investigated and checked found taht Natural program run but unable to log-out from the buffer pool. Many same user-id existed in the user buffer pool until access the limit defined. Please advise on how to exist from the buffer pool when the program run completed ? #### Do you get any error messages? Please provide a **full error** message screenshot and log file. Error 16: Unable to open buffer " too many users logged onto the buffer pool" #### Have you installed all the latest fixes for the products and systems you are using? ---
**Author:** ![Douglas\_Kelly](https://sea1.discourse-cdn.com/techcommunity/user_avatar/techcommunity.softwareag.com/douglas_kelly/32/102_2.png) [@Douglas\_Kelly](https://techcommunity.softwareag.com/u/Douglas_Kelly)\ **Post date:** [March 29, 2023, 6:51pm UTC](https://techcommunity.softwareag.com/t/natural-error-code-16-unable-to-open-buffer-pool/276437/2 "2023-03-29T18:51:29Z")
If your users are able to open multiple Natural sessions, that may be why you are seeing the same user id multiple times - perhaps you just need a higher maxusers setting. I suggest that you open a support request with Software AG. Users logging off of Natural should normally be logged out of the buffer pool also. An upgrade to a current, supported version of Natural might also help. ---
**Author:** ![Yong\_Sam\_Loh](https://avatars.discourse-cdn.com/v4/letter/y/b4bc9f/32.png) [@Yong\_Sam\_Loh](https://techcommunity.softwareag.com/u/Yong_Sam_Loh)\ **Post date:** [March 30, 2023, 4:27am UTC](https://techcommunity.softwareag.com/t/natural-error-code-16-unable-to-open-buffer-pool/276437/3 "2023-03-30T04:27:53Z")
Hi Kelly, Thank you for your prompt reply. I have trying to use “Backout transaction” and “terminate” command to exit from buffer pool, but look like is not working. Is there any Natural command that able to log-out from buffer pool ? How to clear or logging off the user from the buffer pool ? ---
**Author:** ![Douglas\_Kelly](https://sea1.discourse-cdn.com/techcommunity/user_avatar/techcommunity.softwareag.com/douglas_kelly/32/102_2.png) [@Douglas\_Kelly](https://techcommunity.softwareag.com/u/Douglas_Kelly)\ **Post date:** [March 30, 2023, 4:47am UTC](https://techcommunity.softwareag.com/t/natural-error-code-16-unable-to-open-buffer-pool/276437/4 "2023-03-30T04:47:28Z")
“Backout transaction” is an Adabas command, nothing to do with the Natural buffer pool. How high is your maxuser setting? have you tried increasing this value? As far as I know, you can only purge objects in the buffer pool, not users. A support request to Software AG is probably your best bet. ---
**Author:** ![Ralph\_Zbrog](https://sea1.discourse-cdn.com/techcommunity/user_avatar/techcommunity.softwareag.com/ralph_zbrog/32/78_2.png) [@Ralph\_Zbrog](https://techcommunity.softwareag.com/u/Ralph_Zbrog)\ **Post date:** [March 30, 2023, 12:49pm UTC](https://techcommunity.softwareag.com/t/natural-error-code-16-unable-to-open-buffer-pool/276437/5 "2023-03-30T12:49:12Z")
You can clear all users by bouncing the Buffer Pool. I’m running Natural 9.2.1, but the instructions should be the same. . Open Natural Buffer Pool (i.e. natbpmong.exe). . NBP Menu bar → Bufferpool → Shutdown Server . START context menu → Computer Management → Services and Applications → Services . . restart SAG Buffer Pool Service via context menu or menu bar Actions . NBP Menu bar → Bufferpool → Connect ---
**Author:** ![Yong\_Sam\_Loh](https://avatars.discourse-cdn.com/v4/letter/y/b4bc9f/32.png) [@Yong\_Sam\_Loh](https://techcommunity.softwareag.com/u/Yong_Sam_Loh)\ **Post date:** [April 3, 2023, 1:11am UTC](https://techcommunity.softwareag.com/t/natural-error-code-16-unable-to-open-buffer-pool/276437/6 "2023-04-03T01:11:19Z")
Hi Kelly, My MAXUSER is 60 users. I think the scheduled program was not terminate completely causing the same user-id occupied almost 1/3 of the total defined users. ---
**Author:** ![Yong\_Sam\_Loh](https://avatars.discourse-cdn.com/v4/letter/y/b4bc9f/32.png) [@Yong\_Sam\_Loh](https://techcommunity.softwareag.com/u/Yong_Sam_Loh)\ **Post date:** [April 3, 2023, 1:22am UTC](https://techcommunity.softwareag.com/t/natural-error-code-16-unable-to-open-buffer-pool/276437/7 "2023-04-03T01:22:41Z")
Hi Ralph. Thank you for your reply. I think the instructions will shutdown the bufferPool completely. All the users will be affected? But i need to clear one particular user only (that one created many repeated same user in the Buffer pool). ---
**Author:** ![Ralph\_Zbrog](https://sea1.discourse-cdn.com/techcommunity/user_avatar/techcommunity.softwareag.com/ralph_zbrog/32/78_2.png) [@Ralph\_Zbrog](https://techcommunity.softwareag.com/u/Ralph_Zbrog)\ **Post date:** [April 3, 2023, 6:22pm UTC](https://techcommunity.softwareag.com/t/natural-error-code-16-unable-to-open-buffer-pool/276437/8 "2023-04-03T18:22:54Z")
Are you able to see that user’s instance(s) of NATURAL.EXE in Process Explorer (free from Microsoft)? Process Explorer can kill those instances. ---
**Author:** ![Yong\_Sam\_Loh](https://avatars.discourse-cdn.com/v4/letter/y/b4bc9f/32.png) [@Yong\_Sam\_Loh](https://techcommunity.softwareag.com/u/Yong_Sam_Loh)\ **Post date:** [April 5, 2023, 3:51am UTC](https://techcommunity.softwareag.com/t/natural-error-code-16-unable-to-open-buffer-pool/276437/9 "2023-04-05T03:51:05Z")
Hi Ralph, Look like it is working. Thank you very much. The repeated same user had been killed from the buffer pool, but the index number is not refresh. Thank you. ---
**Author:** ![system](https://global.discourse-cdn.com/techcommunity/original/3X/c/d/cd19967bb605d28a72d77eb83a1cae22f3df2eb8.svg) [@system](https://techcommunity.softwareag.com/u/system)\ **Post date:** [October 2, 2023, 3:51am UTC](https://techcommunity.softwareag.com/t/natural-error-code-16-unable-to-open-buffer-pool/276437/10 "2023-10-02T03:51:25Z")
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