Row Count in Table wise in Oracle

Finding Total Table Count in a Schema in Oracle:
    SELECT COUNT(*) Total_Tables FROM DBA_TABLES WHERE OWNER = 'EGRD_HC_2A';
    
Tables with Row Count:
1) SELECT TABLE_NAME, NUM_ROWS, TABLESPACE_NAME, AVG_ROW_LEN, COMPRESSION FROM DBA_TABLES WHERE OWNER = 'EGRD_HC_2A' ORDER BY NUM_ROWS desc;
2) SELECT TABLE_NAME, NUM_ROWS, TABLESPACE_NAME, AVG_ROW_LEN, COMPRESSION FROM USER_TABLES WHERE TABLESPACE_NAME IN('SYSTEM','EGRD_HC_2A') ORDER BY NUM_ROWS desc;

3)
    DECLARE 
    val NUMBER;
    BEGIN
    FOR I IN (SELECT TABLE_NAME FROM USER_TABLES) LOOP
    EXECUTE IMMEDIATE 'SELECT COUNT(*) FROM ' || i.table_name INTO val;
    DBMS_OUTPUT.PUT_LINE('Table: ' ||i.table_name || ', Rows: ' || val );
    END LOOP;
    END;
    /

Increase CPU by Java Example

Increase CPU Load by Java Example

1) Will take 25% CPU in Eclipse, Run 4 instances for 100% CPU.
package utility;
public class BumpCPU {
    public static void main(String[] args) {
        for(; ;) {
        }
    }
}

2) Keep all the Processors in System busy resulting 100% CPU Usage.
package utility;
//Will take 100% CPU, All Processors will be bombarded for creating threads and will be busy by JVM.
public class BurnCPU {
    public static void main(String[] args) {
        int count = Runtime.getRuntime().availableProcessors();
        System.out.println("No of Processors: "+count);
        
        for(int i = 0; i < count; i++) {
            new Thread(new Runnable() {
                public void run() {
                    while(true);  //Thread keep running.
                }
            }).start();
        }
    }
}

------Run above programs and check "top" command output------