Oracle 分区表迁移分区至历史表
记一次生产下分区表迁移分区至历史表的流程
环境描述：
源表：
| / | 源表信息 | 源表分区 |
|---|---|---|
| 表一 | A1 | A1_17,A1_18 |
| 表二 | A2 | A2_17,A2_18 |
| 表三 | A3 | A3_17,A3_18 |
历史表：（已经存在）
| / | 历史表 | 历史表分区 |
|---|---|---|
| 表一 | A1_HIS | A1_HIS_17,A1_HIS_18 |
| 表二 | A2_HIS | A2_HIS_17,A2_HIS_18 |
| 表三 | A3_HIS | A3_HIS_17,A3_HIS_18 |
1.全备3张表
nohup
expdp \'/ as sysdba\'
dumpfile=nowfull.dmp
logfile=nowfull.log
directory=hisclean
tables=dbhang.A1,dbhang.FIN_ACCT_DTL,dbhang.FIN_VOU_INFO &
2.导出A1 2018 2017分区表
expdp dbhang/dbhang dumpfile=A1_1718.dmp directory=hisclean logfile=A1_1718.log tables=A1:A1_2017,A1:A1_2018;
3.获得A1索引语句
select ‘select dbms_metadata.get_ddl’ || q’[(‘INDEX’,’]’|| index_name || q’[’,‘dbhang’)]’ || ’ from dual ’ from dba_indexes where table_name = ‘A1’;
select dbms_metadata.get_ddl(‘INDEX’,‘PK_A1’,‘dbhang’) from dual
CREATE UNIQUE INDEX "dbhang"."PK_A1" ON "dbhang"."A1" ("B_C", "BUS_NO")
PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS
STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1
BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)
TABLESPACE "dbhang_INDEX"
select dbms_metadata.get_ddl(‘INDEX’,‘A1_IDX2’,‘dbhang’) from dual
CREATE INDEX "dbhang"."A1_IDX2" ON "dbhang"."A1" ("A_NO")
PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS
STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1
BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)
TABLESPACE "dbhang_INDEX"
select dbms_metadata.get_ddl(‘INDEX’,‘A1_IDX1’,‘dbhang’) from dual
CREATE INDEX "dbhang"."A1_IDX1" ON "dbhang"."A1" ("B_C")
PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS
STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1
BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)
TABLESPACE "dbhang_INDEX"
4.导入历史表
impdp dbhang/dbhang directory=hisclean dumpfile=A1_1718.dmp remap_table=A1:A1_2017:A1_HIS,A1:A1_2018:A1_HIS table_exists_action=append
5.验证数据一致
查看源表行数：
select count（*） from A1 partition（A1_2017）
COUNT（*）
20245959
select count（*） from A1 partition（A1_2018）
COUNT（*）
23072147
查看历史表行数：
select count（*） from A1_HIS partition（A1_2017）
COUNT（*）
20245959
select count（*） from A1_HIS partition（A1_2018）
COUNT（*）
23072147
6.删除源表分区
alter table A1 truncate partition (A1_2017)
alter table A1 truncate partition (A1_2018)
7.查看索引状态：
SQL>
select index_name,index_type,owner,table_name,table_type,status
from dba_indexes
where table_name='A1';
-------------------------------------------------------------------------------------
INDEX_NAME INDEX_TYPE OWNER TABLE_NAME TABLE_TYPE STATUS
A1_IDX1 NORMAL dbhang A1 TABLE UNUSABLE
A1_IDX2 NORMAL dbhang A1 TABLE UNUSABLE
PK_A1 NORMAL dbhang A1 TABLE UNUSABLE
8.删除索引
drop index A1_IDX1
drop index A1_IDX2
drop index PK_A1
//删除主键时遇到的问题
// ORA-02429
//select owner,constraint_name,constraint_type,table_name from dba_constraints where table_name = ‘A1’ and owner=‘dbhang’;
//alter table A1 drop constraint PK_A1
9.使用获取到的DDL语句重建索引（并记录时间）
重建A1_IDX1：
CREATE INDEX "dbhang"."A1_IDX1" ON "dbhang"."A1" ("B_C")
PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS
STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1
BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)
TABLESPACE "dbhang_INDEX"
重建A1_IDX2：
CREATE INDEX "dbhang"."A1_IDX2" ON "dbhang"."A1" ("A_NO")
PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS
STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1
BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)
TABLESPACE "dbhang_INDEX"
重建PK_A1
CREATE UNIQUE INDEX "dbhang"."PK_A1" ON "dbhang"."A1" ("B_C", "B_NO")
PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS
STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1
BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)
TABLESPACE "dbhang_INDEX"
9.验证索引状态：
SQL>
select index_name,index_type,owner,table_name,table_type,status
from dba_indexes where table_name='A1';
INDEX_NAME INDEX_TYPE OWNER TABLE_NAME TABLE_TYPE STATUS
PK_A1 NORMAL dbhang A1 TABLE VALID
A1_IDX2 NORMAL dbhang A1 TABLE VALID
A1_IDX1 NORMAL dbhang A1 TABLE VALID
10.重建历史表索引
与重建源表索引方式相同
11.重新收集源表统计信息
exec
dbms_stats.gather_table_stats
(ownname=>'dbhang',
estimate_percent=>10,
degree=>4,cascade=>TRUE,
GRANULARITY=>'ALL',
tabname=>'A1');
12.重新收集历史表统计信息
exec
dbms_stats.gather_table_stats
(ownname=>'dbhang',
estimate_percent=>10,
degree=>4,
cascade=>TRUE,
GRANULARITY=>'ALL',
tabname=>'A1_HIS');