oracle查询某用户下所有表的准确记录数

查询所有表的记录数：

create or replace function count_rows(table_name in varchar2,
                                      owner      in varchar2 default null)
  return number authid current_user IS
  num_rows number;
  stmt     varchar2(2000);
begin
  if owner is null then
    stmt := 'select count(*) from "' || table_name || '"';
  else
    stmt := 'select count(*) from "' || owner || '"."' || table_name || '"';
  end if;
  execute immediate stmt
    into num_rows;
  return num_rows;
end;
/

执行：select table_name, count_rows(table_name) nrows from user_tables;

 

以下根据统计信息获取表记录数，不是实时的，不准：

select table_name, count_rows(table_name) nrows from user_tables order by table_name asc;