方法一:
首先建立一个计算函数
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
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;
然后通过计算函数进行统计
select table_name, count_rows(table_name) nrows from user_tables
获取要统计的值
方法二:
select t.table_name,t.num_rows from user_tables t
查看记录数,但是num_rows存储的是上次分析后的值,不准确,要使用该方法,必须分析后才可以试用
完成的语句为
declare
v_tName varchar(50);
v_sqlanalyze varchar(500);
v_num number;
v_sql varchar(500);
cursor c1
is
select table_name from user_tables;
begin
open c1;
loop
fetch c1 into v_tName;
if c1%found then
v_sqlanalyze :='analyze table '||v_tName||' estimate statistics';
execute immediate v_sqlanalyze;
v_sql := 'select NUM_ROWS from user_tables where table_name =upper('''||v_tName||''')';
execute immediate v_sql into v_num;
dbms_output.put_line('表名: '||v_tName||' 行数: '||v_num);
else
exit;
end if;
end loop;
end;
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