Unable to Add Variables to List-Type Visualization When item_option_new Table Contains a Large Number of Records<!-- /*NS Branding Styles*/ --> .ns-kb-css-body-editor-container { p { font-size: 12pt; font-family: Lato; color: #000000; } span { font-size: 12pt; font-family: Lato; color: #000000; } h2 { font-size: 24pt; font-family: Lato; color: black; } h3 { font-size: 18pt; font-family: Lato; color: black; } h4 { font-size: 14pt; font-family: Lato; color: black; } a { font-size: 12pt; font-family: Lato; color: #00718F; } a:hover { font-size: 12pt; color: #024F69; } a:target { font-size: 12pt; color: #032D42; } a:visited { font-size: 12pt; color: #00718f; } ul { font-size: 12pt; font-family: Lato; } li { font-size: 12pt; font-family: Lato; } img { display: ; max-width: ; width: ; height: ; } } Symptoms: When creating a list-type visualization in ServiceNow and attempting to add variables, the variables do not appear or cannot be added successfully. This issue tends to occur on instances where the item_option_new table contains a very large number of records. In such environments, the visualization editor may fail to load or render the list of available variables. Cause: This behavior occurs because the visualization editor retrieves variable-related data from the item_option_new table.When the table contains an excessive number of records, the related queries and data processing may exceed performance limits, causing the variable selection component to fail or time out. Reproduction Steps: This issue can be reproduced using the following steps: 1. Insert 10,000 dummy records into the item_option_new table using the script attached. 2. Create a new list-type visualization. 3. Set the data source of the visualization to the sc_req_item table. 4. Attempt to add variables to the visualization. Result: The variables cannot be added or displayed in the visualization editor. Workarounds: To work around this issue, one of the following options can be used: 1. Clean up the item_option_new table Remove unnecessary or obsolete records, then attempt to add variables again. 2. Create the visualization on another instance Create the list-type visualization on an instance with fewer records in item_option_new, then copy it to the target instance using an Update Set. 3. Manually edit the visualization record Open the relevant record in the par_visualization table.Edit the properties field directly and add the variable’s sys_id to the configuration.