what feature to use in oracle standard edition like that of partitioning in oracle enterprise edition

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[愿得一人] 2021-01-23 21:31

I only have access to oracle standard edition, which feature of oracle standard edition provides the functionality like that of partitioning is there any concept of logically me

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不思量自难忘° (楼主)

2021-01-23 22:03

`Handmade Partitioning` - a working example for Oracle XE/SE

Choose a partitioning key, for example: DOC_DATE - partition for every year.

Create a row type and tables for partitions.

create type DOCS_ROW_TYPE as object (
    doc_id   NUMBER,
    doc_name VARCHAR2(100),
    doc_date DATE
);

-- Create partition YOLD table (data from OLD years)
create table DOCS_YOLD OF DOCS_ROW_TYPE;
alter table DOCS_YOLD modify doc_id not null;
alter table DOCS_YOLD modify doc_date not null;
-- Create primary key
alter table DOCS_YOLD add constraint DOCS_YOLD_PK primary key (DOC_ID) using index;
-- Create indexes 
create index DOCS_YOLD_DATE_IDX on DOCS_YOLD (DOC_DATE);
create index DOCS_YOLD_NAME_UPCASE_IDX on DOCS_YOLD (UPPER(DOC_NAME));

-- Create partition Y2014 table (data from 2014 years)
create table DOCS_Y2014 OF DOCS_ROW_TYPE;
alter table DOCS_Y2014 modify doc_id not null;
alter table DOCS_Y2014 modify doc_date not null;
-- Create primary key
alter table DOCS_Y2014 add constraint DOCS_Y2014_PK primary key (DOC_ID) using index;
-- Create indexes 
create index DOCS_Y2014_DATE_IDX on DOCS_Y2014 (DOC_DATE);
create index DOCS_Y2014_NAME_UPCASE_IDX on DOCS_Y2014 (UPPER(DOC_NAME));

-- Create partition Y2015 table (data from 2015 years)
create table DOCS_Y2015 OF DOCS_ROW_TYPE;
alter table DOCS_Y2015 modify doc_id not null;
alter table DOCS_Y2015 modify doc_date not null;
-- Create primary key
alter table DOCS_Y2015 add constraint DOCS_Y2015_PK primary key (DOC_ID) using index;
-- Create indexes 
create index DOCS_Y2015_DATE_IDX on DOCS_Y2015 (DOC_DATE);
create index DOCS_Y2015_NAME_UPCASE_IDX on DOCS_Y2015 (UPPER(DOC_NAME));

-- Create partition Y2016 table (data from 2016 years)
create table DOCS_Y2016 OF DOCS_ROW_TYPE;
alter table DOCS_Y2016 modify doc_id not null;
alter table DOCS_Y2016 modify doc_date not null;
-- Create primary key
alter table DOCS_Y2016 add constraint DOCS_Y2016_PK primary key (DOC_ID) using index;
-- Create indexes 
create index DOCS_Y2016_DATE_IDX on DOCS_Y2016 (DOC_DATE);
create index DOCS_Y2016_NAME_UPCASE_IDX on DOCS_Y2016 (UPPER(DOC_NAME));

-- Create partition YNEW table (data from NEW years)
create table DOCS_YNEW OF DOCS_ROW_TYPE;
alter table DOCS_YNEW modify doc_id not null;
alter table DOCS_YNEW modify doc_date not null;
-- Create primary key
alter table DOCS_YNEW add constraint DOCS_YNEW_PK primary key (DOC_ID) using index;
-- Create indexes 
create index DOCS_YNEW_DATE_IDX on DOCS_YNEW (DOC_DATE);
create index DOCS_YNEW_NAME_UPCASE_IDX on DOCS_YNEW (UPPER(DOC_NAME));

You have to define correct constraints then Oracle will use filters in query execution plan!

alter table DOCS_YOLD
  add constraint DOCS_YOLD_KEY_CHECK
  check (DOC_DATE < to_date('2014-01-01','yyyy-mm-dd'));

alter table DOCS_Y2014
  add constraint DOCS_Y2014_KEY_CHECK
  check (DOC_DATE >= to_date('2014-01-01','yyyy-mm-dd') and DOC_DATE < to_date('2015-01-01','yyyy-mm-dd'));

alter table DOCS_Y2015
  add constraint DOCS_Y2015_KEY_CHECK
  check (DOC_DATE >= to_date('2015-01-01','yyyy-mm-dd') and DOC_DATE < to_date('2016-01-01','yyyy-mm-dd'));

alter table DOCS_Y2016
  add constraint DOCS_Y2016_KEY_CHECK
  check (DOC_DATE >= to_date('2016-01-01','yyyy-mm-dd') and DOC_DATE < to_date('2017-01-01','yyyy-mm-dd'));

alter table DOCS_YNEW
  add constraint DOCS_YNEW_KEY_CHECK
  check (DOC_DATE >= to_date('2017-01-01','yyyy-mm-dd'));

Create a view DOCS_PARTITIONS as all partitions union

create or replace view docs_partitions as
select * from docs_yold
union all
select * from docs_y2014
union all
select * from docs_y2015
union all
select * from docs_y2016
union all
select * from docs_ynew

Create a PK sequence

create sequence DOCS_MASTER_PK_SEQ
minvalue 1
maxvalue 1000000000
start with 1
increment by 1
cache 10;

Create a "INSTEAD OF" trigger on the DOCS_PARTITIONS view to redistributing data

create or replace trigger docs_partitions_insert
  INSTEAD OF insert on docs_partitions  
  for each row
declare
  v_year number(4);
  v_doc_id docs_partitions.DOC_ID%type;
begin
  v_doc_id := docs_master_pk_seq.nextval;
  v_year := to_number(to_char(:new.doc_date,'yyyy'));
  if (v_year < 2014) then
    insert into docs_yold (doc_id, doc_name, doc_date)
    values (v_doc_id, :new.doc_name, :new.doc_date);
  elsif (v_year = 2014) then
    insert into docs_y2014 (doc_id, doc_name, doc_date)
    values (v_doc_id, :new.doc_name, :new.doc_date);
  elsif (v_year = 2015) then
    insert into docs_y2015 (doc_id, doc_name, doc_date)
    values (v_doc_id, :new.doc_name, :new.doc_date);
  elsif (v_year = 2016) then
    insert into docs_y2016 (doc_id, doc_name, doc_date)
    values (v_doc_id, :new.doc_name, :new.doc_date);
  else
    insert into docs_ynew (doc_id, doc_name, doc_date)
    values (v_doc_id, :new.doc_name, :new.doc_date);
  end if;  
end docs_partitions_insert;

You can also distributing data via a master table - DOCS_MASTER

-- Create partition MASTER table (all data)
create table DOCS_MASTER OF DOCS_ROW_TYPE;
alter table DOCS_MASTER modify doc_id not null;
alter table DOCS_MASTER modify doc_date not null;
-- Create primary key
alter table DOCS_MASTER add constraint DOCS_MASTER_PK primary key (DOC_ID) using index;
-- Create indexes 
create index DOCS_MASTER_DATE_IDX on DOCS_MASTER (DOC_DATE);
create index DOCS_MASTER_NAME_UPCASE_IDX on DOCS_MASTER (UPPER(DOC_NAME));

Create a trigger on the DOCS_MASTER table to redistributing data

create or replace trigger docs_master_insert
  before insert on docs_master  
  for each row
declare
  v_year number(4);
begin
  :new.doc_id := docs_master_pk_seq.nextval;
  v_year := to_number(to_char(:new.doc_date,'yyyy'));
  if (v_year < 2014) then
    insert into docs_yold (doc_id, doc_name, doc_date)
    values (:new.doc_id, :new.doc_name, :new.doc_date);
  elsif (v_year = 2014) then
    insert into docs_y2014 (doc_id, doc_name, doc_date)
    values (:new.doc_id, :new.doc_name, :new.doc_date);
  elsif (v_year = 2015) then
    insert into docs_y2015 (doc_id, doc_name, doc_date)
    values (:new.doc_id, :new.doc_name, :new.doc_date);
  elsif (v_year = 2016) then
    insert into docs_y2016 (doc_id, doc_name, doc_date)
    values (:new.doc_id, :new.doc_name, :new.doc_date);
  else
    insert into docs_ynew (doc_id, doc_name, doc_date)
    values (:new.doc_id, :new.doc_name, :new.doc_date);
  end if;  
end docs_master_insert;

Generate data for test

declare
  v_i integer;
  v_count integer := 1000000;
begin
  -- insert docs through the master table
  for v_i in 1..v_count
  loop
        insert into docs_master (doc_name, doc_date)
        values (
               'DOC-M-'||v_i, 
               to_date(trunc(DBMS_RANDOM.VALUE(to_char(TO_DATE('2000-01-01','yyyy-mm-dd'),'J'),to_char(TO_DATE('2100-01-01','yyyy-mm-dd'),'J'))),'J')
        );
        if mod(v_i,10000)=0 then
          commit;
          dbms_output.put_line('rows M inserted: '||v_i||', '||(round(100*v_i/v_count))||'%');
        end if;
  end loop;
  commit;
  -- insert docs through the partitions view
  /*
  for v_i in 1..2
  loop
        insert into docs_partitions (doc_name, doc_date)
        values (
               'DOC-P-'||v_i, 
               to_date(trunc(DBMS_RANDOM.VALUE(to_char(TO_DATE('2000-01-01','yyyy-mm-dd'),'J'),to_char(TO_DATE('2100-01-01','yyyy-mm-dd'),'J'))),'J')
        );
        if mod(v_i,1000)=0 then
          commit;
          dbms_output.put_line('rows P inserted: '||v_i);
        end if;
  end loop;
  commit;
  */
end;

Select data from the DOCS_PARTITIONS view

select dp.* 
from DOCS_PARTITIONS dp 
where 
  dp.DOC_DATE between to_date('2014-02','yyyy-mm') and to_date('2014-03','yyyy-mm')

-- SQL execution plan with filters!!!
SELECT STATEMENT, GOAL = ALL_ROWS           0   1   78
 VIEW   PART_TEST   DOCS_PARTITIONS 0   1   78
  UNION-ALL                 
   FILTER                   
    TABLE ACCESS BY INDEX ROWID PART_TEST   DOCS_YOLD   3   11  814
     INDEX RANGE SCAN   PART_TEST   DOCS_YOLD_DATE_IDX  3   833 
   TABLE ACCESS BY INDEX ROWID  PART_TEST   DOCS_Y2014  1   750 55500
    INDEX RANGE SCAN    PART_TEST   DOCS_Y2014_DATE_IDX 1   45  
   FILTER                   
    TABLE ACCESS BY INDEX ROWID PART_TEST   DOCS_Y2015  1   1   74
     INDEX RANGE SCAN   PART_TEST   DOCS_Y2015_DATE_IDX 1   44  
   FILTER                   
    TABLE ACCESS BY INDEX ROWID PART_TEST   DOCS_Y2016  1   1   74
     INDEX RANGE SCAN   PART_TEST   DOCS_Y2016_DATE_IDX 1   47  
   FILTER                   
    TABLE ACCESS BY INDEX ROWID PART_TEST   DOCS_YNEW   14  61  4514
     INDEX RANGE SCAN   PART_TEST   DOCS_YNEW_DATE_IDX  14  5565

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what feature to use in oracle standard edition like that of partitioning in oracle enterprise edition

Handmade Partitioning - a working example for Oracle XE/SE

`Handmade Partitioning` - a working example for Oracle XE/SE