How to solve "Unable to allocate memory. Cannot start memberOf plugin" error in Oracle Database?

The error message "Unable to allocate memory. Cannot start memberOf plugin" in Oracle typically indicates that the system is running out of memory, and as a result, the "memberOf" plugin cannot be started.

The "memberOf" plugin is used to provide group membership information to clients in Oracle Directory Server Enterprise Edition (ODSEE). This error can occur when there is insufficient memory available to start the plugin.

To resolve this issue, you can try increasing the amount of memory available to the system, either by adding more physical memory to the server, or by adjusting the memory allocation settings in the configuration files.

Here are some steps you can take to increase memory:

Check the current memory usage of the system using the "free" or "top" commands in the terminal.
If the system is running low on memory, try increasing the swap space by creating a swap file. To create a swap file, you can use the "dd" command to create a file of a specified size and then format it as swap space using the "mkswap" command.
If the swap space is not the issue, then check if the system is configured to use all available memory. You can do this by checking the values of the "vm.swappiness" and "vm.overcommit_memory" kernel parameters. If these values are not set appropriately, you may need to adjust them to allow the system to use more memory.
Another option is to adjust the memory allocation settings in the ODSEE configuration files. You can increase the "maxmemsize" parameter in the "dse.ldif" file to allocate more memory to ODSEE.
After making any changes to the system or ODSEE configuration files, restart the ODSEE service to apply the changes.

If none of these steps resolves the issue, you may need to investigate further to determine the root cause of the problem. This could involve reviewing log files, checking for any known issues with the Oracle software version you are using, or contacting Oracle support for assistance.

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