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Statement resources are spent performing merge operation.
| Heavy Merge finding |
| Description | |
| What to do next | Perform one of the following options: n Click the Locate icon to focus on the relevant step in the execution plan. n Select the finding type to investigate step statistics and resource consumption in the Statistics tab. |
| Advice | Try to solve the problem at the statement level by one of the following options: n If the hash operation involves I/O against temporary tablespace, you can reduce the I/O consumption for the hash operation by changing the SORT_AREA_SIZE to a higher value. If you are using PGA settings, you can change the PGA_Aggregated_Target, so as to avoid sort area size problems. You can either change the values for a specific session using the Alter Session command, or for the entire instance. |
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