When you receive an error message saying "There's insufficient system memory to run this query" in SQL Server, it means that the database engine was not able to allocate enough memory to complete the query.
Here are some steps you can take to address this issue:
Reduce the size of the query: If the query you're running is particularly large or complex, consider breaking it down into smaller pieces or using more specific criteria to reduce the amount of data being queried.
Increase the amount of available memory: If possible, you can try adding more physical memory to the server. Alternatively, you can increase the maximum amount of memory that SQL Server is allowed to use by adjusting the "max server memory" setting in SQL Server Configuration Manager.
Optimize your database and queries: Review your database schema and queries to see if there are any optimizations that can be made to reduce memory usage. This could include adding indexes, rewriting queries, or modifying the database schema.
Check for other processes using too much memory: If there are other processes running on the server that are using a lot of memory, this could be contributing to the problem. You can use the Task Manager or Resource Monitor to check for high memory usage by other processes.
Consider upgrading your hardware or software: If none of the above solutions work, it may be time to consider upgrading your hardware or software. This could include adding more memory, upgrading to a newer version of SQL Server, or using a different database engine altogether
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