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ServiceNow display list of large tables where last record updated > 6 months ago

code snippet - modify filter parameters as needed (STARTSWITH query could also be changed to LIKE)

var sLogSource = 'fixScr:largeOldTables';
gs.print('script start', sLogSource);
 
var sizeCheck= 100;
var monthsAgoCheck=6;
var tableNameMatch='cmdb';
 

var gr = new GlideRecord('sys_dictionary');
gr.addEncodedQuery('internal_type.label=Collection');
gr.addEncodedQuery('nameSTARTSWITH' + tableNameMatch);

gr.query();

gs.print('TOTAL TABLES TARGETTED: ' + gr.getRowCount());

while (gr.next()) {
    var tableName = gr.name.toString();
    try {
        var gr1 = new GlideAggregate(tableName);
        gr1.addAggregate('COUNT');
        gr1.query();
        if (gr1.next()) {
            var lastUpdated = getLatestRecord(tableName, sLogSource)+"";
            if (!gs.nil(lastUpdated)) {
                var tableCount = gr1.getAggregate('COUNT');
                if (tableCount > sizeCheck) {
                   
                    var luDate = new GlideDateTime(lastUpdated);
                    if (luDate < gs.monthsAgoStart(monthsAgoCheck)) {
                        gs.print('Table: ' + tableName + ' has: ' + tableCount + ' records, [table last updated: ' + lastUpdated + ']', sLogSource);
                    }
                }
            }
        }
    } catch (err) {
        gs.logError("We've got an error for table: " + gr.name.toString() + "- " + err.toString(), sLogSource);

        //break;
        continue;
    }
}
gs.print('script end', sLogSource);

function getLatestRecord(tableName, logsource) {
    var dReturn = '';
    try {
        var gr = new GlideRecord(tableName);
        gr.orderByDesc('sys_updated_on');
        gr.setLimit(1);
        gr.query();
        if (gr.next()) {
            if (!gs.nil(gr.sys_updated_on)) {
                dReturn = gr.getValue("sys_updated_on");
                //gs.log(tableName+'::TABLE LAST UPDATED:' + dReturn,logsource);
            }
        }
    } catch (ex) {}
    return dReturn;
}


}

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