Question

我想了解为什么流水线功能没有返回任何结果我在这里做错了什么想法。

归功于原作者

CREATE OR REPLACE PACKAGE MANAGE_SPACE AS
--Author Tanmay 
g_tblspce_threshold number := 80;
TYPE tblespaces_record IS RECORD(
       tablespace_name VARCHAR2(30), 
       percentage_used NUMBER
       );
TYPE tblespaces_table IS TABLE OF tblespaces_record;

function list_tblspcs_excd_thresld 
return tblespaces_table PIPELINED ;

END MANAGE_SPACE;

包体

CREATE OR REPLACE PACKAGE BODY MANAGE_SPACE
AS
  --Author Tanmay
  FUNCTION list_tblspcs_excd_thresld
    RETURN tblespaces_table PIPELINED
  AS
    tblspaces            tblespaces_record;
  BEGIN
   for x in (SELECT a.tablespace_name tablespace_name,
      ROUND (((c.BYTES - NVL (b.BYTES, 0)) / c.BYTES) * 100) percentage_used
      into tblspaces
    FROM dba_tablespaces a,
      (SELECT tablespace_name,
        SUM (BYTES) BYTES
      FROM dba_free_space
      GROUP BY tablespace_name
      ) b,
      (SELECT COUNT (1) DATAFILES,
        SUM (BYTES) BYTES,
        tablespace_name
      FROM dba_data_files
      GROUP BY tablespace_name
      ) c
    WHERE b.tablespace_name(+) = a.tablespace_name
    AND c.tablespace_name(+)   = a.tablespace_name
    AND ROUND (((c.BYTES - NVL (b.BYTES, 0)) / c.BYTES) * 100) > g_tblspce_threshold 
    ORDER BY NVL (((c.BYTES - NVL (b.BYTES, 0)) / c.BYTES), 0) DESC)
    loop
        PIPE ROW (tblspaces);
    end loop;
    return;
  END list_tblspcs_excd_thresld;
END MANAGE_SPACE;

执行此包不会返回任何行

SQL> select * from table(MANAGE_SPACE.list_tblspcs_excd_thresld())
  2
SQL> /

TABLESPACE_NAME                PERCENTAGE_USED
------------------------------ ---------------

我做错了什么

Answer 1

您需要填充数组。最简单的方法是使用BULK COLLECT语法。然后循环遍历数组并输出行。

这是我修改后的软件包版本。

CREATE OR REPLACE PACKAGE BODY MANAGE_SPACE
AS
  FUNCTION list_tblspcs_excd_thresld
    RETURN tblespaces_table PIPELINED
  AS
    -- collection type not record type
    tblspaces             tblespaces_table;
  BEGIN
   select * 
   -- populate the collection
   bulk collect  into tblspaces
   from
   (SELECT a.tablespace_name tablespace_name,
      ROUND (((c.BYTES - NVL (b.BYTES, 0)) / c.BYTES) * 100) percentage_used
    FROM dba_tablespaces a,
      (SELECT tablespace_name,
        SUM (BYTES) BYTES
      FROM dba_free_space
      GROUP BY tablespace_name
      ) b,
      (SELECT COUNT (1) DATAFILES,
        SUM (BYTES) BYTES,
        tablespace_name
      FROM dba_data_files
      GROUP BY tablespace_name
      ) c
    WHERE b.tablespace_name(+) = a.tablespace_name
    AND c.tablespace_name(+)   = a.tablespace_name
    AND ROUND (((c.BYTES - NVL (b.BYTES, 0)) / c.BYTES) * 100) > g_tblspce_threshold 
    ORDER BY NVL (((c.BYTES - NVL (b.BYTES, 0)) / c.BYTES), 0) DESC);
    -- loop round the collection
    for i in 1..tblspaces.count()
    loop
        PIPE ROW (tblspaces(i));
    end loop;
    return;
  END list_tblspcs_excd_thresld;
END MANAGE_SPACE;

这是输出：

SQL> select * from table(MANAGE_SPACE.list_tblspcs_excd_thresld())
  2  /

TABLESPACE_NAME                PERCENTAGE_USED
------------------------------ ---------------
SYSTEM                                     100
SYSAUX                                      91
APEX_2614203650434107                       90
EXAMPLE                                     87
USERS                                       82

SQL>

@a_horse_with_no_name对内存消耗提出了一个很好的观点。集合保存在会话的内存空间PGA中。在这种特殊情况下，数据库不太可能有足够的表空间来破坏PGA限制。但是对于可能具有更大结果集的其他查询，存在BULK COLLECT ... LIMIT语法，这允许我们将结果集的可管理块提取到我们的集合中。 Find out more

管道表功能

1 个答案: