分区表实验
分区表实验：
Ø 可以使用using index local在表建立是在指定存储上建立索引。对于分区表则索引存储在每个分区表空间内。
Ø 分区表空间离线后，分区表上这部分的数据无法使用，整个分区表也无法访问。
Ø 可以采用交换分区的技术来建损坏的分区部分转移到一张表上，前提是表的字段结构要和分区表一致。
Ø 转移过后分区表的损坏分区默认存储会变成system，但是索引还是坏的分区表空间，需要我们手动的删除索引后分区表就可以访问了，但是损坏分区的数据会丢失。
第一步，创建空间使用包
create or replace procedure show_space
( p_segname in varchar2,
p_owner in varchar2 default user,
p_type in varchar2 default 'TABLE',
p_partition in varchar2 default NULL )
-- this procedure uses authid current user so it can query DBA_*
-- views using privileges from a ROLE, and so it can be installed
-- once per database, instead of once per user who wanted to use it
authid current_user
as
l_free_blks number;
l_total_blocks number;
l_total_bytes number;
l_unused_blocks number;
l_unused_bytes number;
l_LastUsedExtFileId number;
l_LastUsedExtBlockId number;
l_LAST_USED_BLOCK number;
l_segment_space_mgmt varchar2(255);
l_unformatted_blocks number;
l_unformatted_bytes number;
l_fs1_blocks number; l_fs1_bytes number;
l_fs2_blocks number; l_fs2_bytes number;
l_fs3_blocks number; l_fs3_bytes number;
l_fs4_blocks number; l_fs4_bytes number;
l_full_blocks number; l_full_bytes number;
-- inline procedure to print out numbers nicely formatted
-- with a simple label
procedure p( p_label in varchar2, p_num in number )
is
begin
dbms_output.put_line( rpad(p_label,40,'.') ||
to_char(p_num,'999,999,999,999') );
end;
begin
-- this query is executed dynamically in order to allow this procedure
-- to be created by a user who has access to DBA_SEGMENTS/TABLESPACES
-- via a role as is customary.
-- NOTE: at runtime, the invoker MUST have access to these two
-- views!
-- this query determines if the object is an ASSM object or not
begin
execute immediate
'select ts.segment_space_management
from dba_segments seg, dba_tablespaces ts
where seg.segment_name = :p_segname
and (:p_partition is null or
seg.partition_name = :p_partition)
and seg.owner = :p_owner
and seg.tablespace_name = ts.tablespace_name'
into l_segment_space_mgmt
using p_segname, p_partition, p_partition, p_owner;
exception
when too_many_rows then
dbms_output.put_line
( 'This must be a partitioned table, use p_partition => ');
return;
end;
-- if the object is in an ASSM tablespace, we must use this API
-- call to get space information, otherwise we use the FREE_BLOCKS
-- API for the user-managed segments
if l_segment_space_mgmt = 'AUTO'
then
dbms_space.space_usage
( p_owner, p_segname, p_type, l_unformatted_blocks,
l_unformatted_bytes, l_fs1_blocks, l_fs1_bytes,
l_fs2_blocks, l_fs2_bytes, l_fs3_blocks, l_fs3_bytes,
l_fs4_blocks, l_fs4_bytes, l_full_blocks, l_full_bytes, p_partition);
p( 'Unformatted Blocks ', l_unformatted_blocks );
p( 'FS1 Blocks (0-25) ', l_fs1_blocks );
p( 'FS2 Blocks (25-50) ', l_fs2_blocks );
p( 'FS3 Blocks (50-75) ', l_fs3_blocks );
p( 'FS4 Blocks (75-100)', l_fs4_blocks );
p( 'Full Blocks ', l_full_blocks );
else
dbms_space.free_blocks(
segment_owner => p_owner,
segment_name => p_segname,
segment_type => p_type,
freelist_group_id => 0,
free_blks => l_free_blks);
p( 'Free Blocks', l_free_blks );
end if;
-- and then the unused space API call to get the rest of the
-- information
dbms_space.unused_space
( segment_owner => p_owner,
segment_name => p_segname,
segment_type => p_type,
partition_name => p_partition,
total_blocks => l_total_blocks,
total_bytes => l_total_bytes,
unused_blocks => l_unused_blocks,
unused_bytes => l_unused_bytes,
LAST_USED_EXTENT_FILE_ID => l_LastUsedExtFileId,
LAST_USED_EXTENT_BLOCK_ID => l_LastUsedExtBlockId,
LAST_USED_BLOCK => l_LAST_USED_BLOCK );
p( 'Total Blocks', l_total_blocks );
p( 'Total Bytes', l_total_bytes );
p( 'Total MBytes', trunc(l_total_bytes/1024/1024) );
p( 'Unused Blocks', l_unused_blocks );
p( 'Unused Bytes', l_unused_bytes );
p( 'Last Used Ext FileId', l_LastUsedExtFileId );
p( 'Last Used Ext BlockId', l_LastUsedExtBlockId );
p( 'Last Used Block', l_LAST_USED_BLOCK );
end;
/
( p_segname in varchar2,
p_owner in varchar2 default user,
p_type in varchar2 default 'TABLE',
p_partition in varchar2 default NULL )
-- this procedure uses authid current user so it can query DBA_*
-- views using privileges from a ROLE, and so it can be installed
-- once per database, instead of once per user who wanted to use it
authid current_user
as
l_free_blks number;
l_total_blocks number;
l_total_bytes number;
l_unused_blocks number;
l_unused_bytes number;
l_LastUsedExtFileId number;
l_LastUsedExtBlockId number;
l_LAST_USED_BLOCK number;
l_segment_space_mgmt varchar2(255);
l_unformatted_blocks number;
l_unformatted_bytes number;
l_fs1_blocks number; l_fs1_bytes number;
l_fs2_blocks number; l_fs2_bytes number;
l_fs3_blocks number; l_fs3_bytes number;
l_fs4_blocks number; l_fs4_bytes number;
l_full_blocks number; l_full_bytes number;
-- inline procedure to print out numbers nicely formatted
-- with a simple label
procedure p( p_label in varchar2, p_num in number )
is
begin
dbms_output.put_line( rpad(p_label,40,'.') ||
to_char(p_num,'999,999,999,999') );
end;
begin
-- this query is executed dynamically in order to allow this procedure
-- to be created by a user who has access to DBA_SEGMENTS/TABLESPACES
-- via a role as is customary.
-- NOTE: at runtime, the invoker MUST have access to these two
-- views!
-- this query determines if the object is an ASSM object or not
begin
execute immediate
'select ts.segment_space_management
from dba_segments seg, dba_tablespaces ts
where seg.segment_name = :p_segname
and (:p_partition is null or
seg.partition_name = :p_partition)
and seg.owner = :p_owner
and seg.tablespace_name = ts.tablespace_name'
into l_segment_space_mgmt
using p_segname, p_partition, p_partition, p_owner;
exception
when too_many_rows then
dbms_output.put_line
( 'This must be a partitioned table, use p_partition => ');
return;
end;
-- if the object is in an ASSM tablespace, we must use this API
-- call to get space information, otherwise we use the FREE_BLOCKS
-- API for the user-managed segments
if l_segment_space_mgmt = 'AUTO'
then
dbms_space.space_usage
( p_owner, p_segname, p_type, l_unformatted_blocks,
l_unformatted_bytes, l_fs1_blocks, l_fs1_bytes,
l_fs2_blocks, l_fs2_bytes, l_fs3_blocks, l_fs3_bytes,
l_fs4_blocks, l_fs4_bytes, l_full_blocks, l_full_bytes, p_partition);
p( 'Unformatted Blocks ', l_unformatted_blocks );
p( 'FS1 Blocks (0-25) ', l_fs1_blocks );
p( 'FS2 Blocks (25-50) ', l_fs2_blocks );
p( 'FS3 Blocks (50-75) ', l_fs3_blocks );
p( 'FS4 Blocks (75-100)', l_fs4_blocks );
p( 'Full Blocks ', l_full_blocks );
else
dbms_space.free_blocks(
segment_owner => p_owner,
segment_name => p_segname,
segment_type => p_type,
freelist_group_id => 0,
free_blks => l_free_blks);
p( 'Free Blocks', l_free_blks );
end if;
-- and then the unused space API call to get the rest of the
-- information
dbms_space.unused_space
( segment_owner => p_owner,
segment_name => p_segname,
segment_type => p_type,
partition_name => p_partition,
total_blocks => l_total_blocks,
total_bytes => l_total_bytes,
unused_blocks => l_unused_blocks,
unused_bytes => l_unused_bytes,
LAST_USED_EXTENT_FILE_ID => l_LastUsedExtFileId,
LAST_USED_EXTENT_BLOCK_ID => l_LastUsedExtBlockId,
LAST_USED_BLOCK => l_LAST_USED_BLOCK );
p( 'Total Blocks', l_total_blocks );
p( 'Total Bytes', l_total_bytes );
p( 'Total MBytes', trunc(l_total_bytes/1024/1024) );
p( 'Unused Blocks', l_unused_blocks );
p( 'Unused Bytes', l_unused_bytes );
p( 'Last Used Ext FileId', l_LastUsedExtFileId );
p( 'Last Used Ext BlockId', l_LastUsedExtBlockId );
p( 'Last Used Block', l_LAST_USED_BLOCK );
end;
/
第二步 创建行列转换函数
create or replace type myScalarType as object
( rnum number, cname varchar2(30), val varchar2(4000) )
/
( rnum number, cname varchar2(30), val varchar2(4000) )
/
第三步
create or replace function is_number( p_str in varchar2 ) return number
as
l_number number;
begin
l_number := p_str;
return 1;
exception
when others then return 0;
end;
/
as
l_number number;
begin
l_number := p_str;
return 1;
exception
when others then return 0;
end;
/
第四步
create or replace
function cols_as_rows( p_query in varchar2 ) return myTableType
-- this function is designed to be installed ONCE per database, and
-- it is nice to have ROLES active for the dynamic sql, hence the
-- AUTHID CURRENT_USER
authid current_user
-- this function is a pipelined function -- meaning, it'll send
-- rows back to the client before getting the last row itself
-- in 8i, we cannot do this
PIPELINED
as
l_theCursor integer default dbms_sql.open_cursor;
l_columnValue varchar2(4000);
l_status integer;
l_colCnt number default 0;
l_descTbl dbms_sql.desc_tab;
l_rnum number := 1;
begin
-- parse, describe and define the query. Note, unlike print_table
-- i am not altering the session in this routine. the
-- caller would use TO_CHAR() on dates to format and if they
-- want, they would set cursor_sharing. This routine would
-- be called rather infrequently, I did not see the need
-- to set cursor sharing therefore.
dbms_sql.parse( l_theCursor, p_query, dbms_sql.native );
dbms_sql.describe_columns( l_theCursor, l_colCnt, l_descTbl );
for i in 1 .. l_colCnt loop
dbms_sql.define_column( l_theCursor, i, l_columnValue, 4000 );
end loop;
-- Now, execute the query and fetch the rows. Iterate over
-- the columns and "pipe" each column out as a separate row
-- in the loop. increment the row counter after each
-- dbms_sql row
l_status := dbms_sql.execute(l_theCursor);
while ( dbms_sql.fetch_rows(l_theCursor) > 0 )
loop
for i in 1 .. l_colCnt
loop
dbms_sql.column_value( l_theCursor, i, l_columnValue );
pipe row
(myScalarType( l_rnum, l_descTbl(i).col_name, l_columnValue ));
end loop;
l_rnum := l_rnum+1;
end loop;
-- clean up and return...
dbms_sql.close_cursor(l_theCursor);
return;
end cols_as_rows;
/
function cols_as_rows( p_query in varchar2 ) return myTableType
-- this function is designed to be installed ONCE per database, and
-- it is nice to have ROLES active for the dynamic sql, hence the
-- AUTHID CURRENT_USER
authid current_user
-- this function is a pipelined function -- meaning, it'll send
-- rows back to the client before getting the last row itself
-- in 8i, we cannot do this
PIPELINED
as
l_theCursor integer default dbms_sql.open_cursor;
l_columnValue varchar2(4000);
l_status integer;
l_colCnt number default 0;
l_descTbl dbms_sql.desc_tab;
l_rnum number := 1;
begin
-- parse, describe and define the query. Note, unlike print_table
-- i am not altering the session in this routine. the
-- caller would use TO_CHAR() on dates to format and if they
-- want, they would set cursor_sharing. This routine would
-- be called rather infrequently, I did not see the need
-- to set cursor sharing therefore.
dbms_sql.parse( l_theCursor, p_query, dbms_sql.native );
dbms_sql.describe_columns( l_theCursor, l_colCnt, l_descTbl );
for i in 1 .. l_colCnt loop
dbms_sql.define_column( l_theCursor, i, l_columnValue, 4000 );
end loop;
-- Now, execute the query and fetch the rows. Iterate over
-- the columns and "pipe" each column out as a separate row
-- in the loop. increment the row counter after each
-- dbms_sql row
l_status := dbms_sql.execute(l_theCursor);
while ( dbms_sql.fetch_rows(l_theCursor) > 0 )
loop
for i in 1 .. l_colCnt
loop
dbms_sql.column_value( l_theCursor, i, l_columnValue );
pipe row
(myScalarType( l_rnum, l_descTbl(i).col_name, l_columnValue ));
end loop;
l_rnum := l_rnum+1;
end loop;
-- clean up and return...
dbms_sql.close_cursor(l_theCursor);
return;
end cols_as_rows;
/
第五步，
create table stage as select * from all_objects;
第六步，建立表空间TEST1
create tablespace test1
datafile '/tmp/test1.dbf'
size 512k reuse;
datafile '/tmp/test1.dbf'
size 512k reuse;
第七步，建立表空间TEST2
create tablespace test2
datafile '/tmp/test2.dbf'
size 512k reuse;
datafile '/tmp/test2.dbf'
size 512k reuse;
第八步，创建分区表
CREATE TABLE t
( x int,
y date,
z varchar2(25),
constraint t_pk PRIMARY KEY(x) using index local
)
PARTITION BY RANGE (x) (
PARTITION t_p1 VALUES LESS THAN (5) tablespace test1,
PARTITION t_p2 VALUES LESS THAN (10) tablespace test2
);
( x int,
y date,
z varchar2(25),
constraint t_pk PRIMARY KEY(x) using index local
)
PARTITION BY RANGE (x) (
PARTITION t_p1 VALUES LESS THAN (5) tablespace test1,
PARTITION t_p2 VALUES LESS THAN (10) tablespace test2
);
第九步，
insert into t values ( 1, sysdate, 'hello' );
insert into t values ( 7, sysdate, 'bye' );
第十步，查看一下
SQL> select * from t;
X Y Z
---------- --------- -------------------------
1 05-JUN-10 hello
7 05-JUN-10 bye
---------- --------- -------------------------
1 05-JUN-10 hello
7 05-JUN-10 bye
SQL> set linesize 180
SQL> select table_name, partition_name, tablespace_name from user_tab_partitions where table_name = 'T' ;
SQL> select table_name, partition_name, tablespace_name from user_tab_partitions where table_name = 'T' ;
TABLE_NAME PARTITION_NAME TABLESPACE_NAME
------------------------------ ------------------------------ ------------------------------
T T_P1 TEST1
T T_P2 TEST2
------------------------------ ------------------------------ ------------------------------
T T_P1 TEST1
T T_P2 TEST2
SQL> select index_name, partition_name, tablespace_name from user_ind_partitions where index_name = 'T_PK';
INDEX_NAME PARTITION_NAME TABLESPACE_NAME
------------------------------ ------------------------------ ------------------------------
T_PK T_P1 TEST1
T_PK T_P2 TEST2
------------------------------ ------------------------------ ------------------------------
T_PK T_P1 TEST1
T_PK T_P2 TEST2
第十一步，将此数据文件从数据字典中移除
SQL> alter database datafile '/tmp/test2.dbf' offline drop;
Database altered.
SQL> select * from t;
ERROR:
ORA-00376: file 6 cannot be read at this time
ORA-01110: data file 6: '/tmp/test2.dbf'
ERROR:
ORA-00376: file 6 cannot be read at this time
ORA-01110: data file 6: '/tmp/test2.dbf'
no rows selected
SQL> alter table t drop partition t_p2;
alter table t drop partition t_p2
*
ERROR at line 1:
ORA-00376: file 6 cannot be read at this time
ORA-01110: data file 6: '/tmp/test2.dbf'
alter table t drop partition t_p2
*
ERROR at line 1:
ORA-00376: file 6 cannot be read at this time
ORA-01110: data file 6: '/tmp/test2.dbf'
SQL> alter database datafile '/tmp/test2.dbf' online;
alter database datafile '/tmp/test2.dbf' online
*
ERROR at line 1:
ORA-01113: file 6 needs media recovery
ORA-01110: data file 6: '/tmp/test2.dbf'
SQL> create table dummy ( x int, y date, z varchar2(25),constraint dummy_pk primary key(x) );
Table created.
SQL> alter table t exchange partition t_p2 with table dummy; 精华啊！！！
Table altered.
SQL> select * from t;
X Y Z
---------- --------- -------------------------
1 05-JUN-10 hello
---------- --------- -------------------------
1 05-JUN-10 hello
SQL> select index_name, partition_name, tablespace_name from user_ind_partitions where index_name = 'T_PK';
INDEX_NAME PARTITION_NAME TABLESPACE_NAME
------------------------------ ------------------------------ ------------------------------
T_PK T_P1 TEST1
T_PK T_P2 TEST2
------------------------------ ------------------------------ ------------------------------
T_PK T_P1 TEST1
T_PK T_P2 TEST2
SQL> select table_name, partition_name, tablespace_name from user_tab_partitions where table_name = 'T';
TABLE_NAME PARTITION_NAME TABLESPACE_NAME
------------------------------ ------------------------------ ------------------------------
T T_P1 TEST1
T T_P2 SYSTEM
------------------------------ ------------------------------ ------------------------------
T T_P1 TEST1
T T_P2 SYSTEM
SQL> insert into t values ( 8, sysdate, 'hello2' );
insert into t values ( 8, sysdate, 'hello2' )
*
ERROR at line 1:
ORA-01502: index 'SYS.T_PK' or partition of such index is in unusable state
insert into t values ( 8, sysdate, 'hello2' )
*
ERROR at line 1:
ORA-01502: index 'SYS.T_PK' or partition of such index is in unusable state
SQL> alter table t drop primary key ;
Table altered.
SQL> alter table t drop partition t_p2;
Table altered.
SQL> select table_name, partition_name, tablespace_name from user_tab_partitions where table_name = 'T';
TABLE_NAME PARTITION_NAME TABLESPACE_NAME
------------------------------ ------------------------------ ------------------------------
T T_P1 TEST1
------------------------------ ------------------------------ ------------------------------
T T_P1 TEST1
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/21158541/viewspace-668090/ ，如需转载，请注明出处，否则将追究法律责任。
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