oracle中一个块可以存储多少行数据？

1

文档课题：oracle中一个块可以存储多少行数据？
测试环境：oracle 19.12 64位 + 多租户
1、建表
SQL> conn sys/oracle_4U@orclpdb as sysdba
Connected.
SQL> create table blockrow (id varchar2(1));

Table created.

SQL> begin
  2  for i in 1..10000 loop
  3      insert into blockrow values ('b');
  4  end loop;
  5  commit;
  6  end;
  7  /

PL/SQL procedure successfully completed.

SQL> select * from blockrow where rownum<11;

I
-
b
b
b
b
b
b
b
b
b
b

10 rows selected.

SQL> select count(*) from blockrow;

  COUNT(*)
----------
     10000
2、查询
查表blockrow rowid对应的相对文件号以及数据块号.
select dbms_rowid.rowid_relative_fno(rowid) f,
        dbms_rowid.rowid_block_number(rowid) b
  from blockrow;
         F          B
---------- ----------
         1      45433
         1      45433
         1      45433
         1      45433
         1      45433
         1      45433
         1      45433
         1      45433
         1      45433
         1      45433

10 rows selected.
说明：
dbms_rowid.rowid_relative_fno(rowid)为rowid的相对文件号
dbms_rowid.rowid_block_number(rowid)为rowid的数据块号
参考：
https://docs.oracle.com/cd/E11882_01/appdev.112/e40758/d_rowid.htm#ARPS67770
https://docs.oracle.com/cd/E11882_01/appdev.112/e40758/d_rowid.htm#ARPS67762
查每个块对应的行数.
select f, b, count(*)
  from (select dbms_rowid.rowid_relative_fno(rowid) f,
               dbms_rowid.rowid_block_number(rowid) b
          from blockrow)
 group by f, b
 order by b;

         F          B   COUNT(*)
---------- ---------- ----------
         1      45433        660
         1      45434        660
         1      45435        660
         1      45436        660
         1      45437        660
         1      45438        660
         1      45439        660
         1      45440        660
         1      45441        660
         1      45442        660
         1      45443        660

         F          B   COUNT(*)
---------- ---------- ----------
         1      45444        660
         1      45445        660
         1      45446        660
         1      45447        660
         1      45448        100

16 rows selected.
查数据块大小.
SQL> show parameter db_block_size

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
db_block_size                        integer     8192

总结：综上所述，一个块8k可以存储表blockrow 660行数据.

说明：以上内容参照以下网址.
https://blog.csdn.net/hezuijiudexiaobai/article/details/121017638