Created
March 22, 2016 12:23
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[ORACLE] Create Index on Foreign Key
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| set serveroutput on; | |
| set timing on; | |
| begin | |
| for rec in (select 'create index ' || substr(table_name, 1, 22) || '_FKIDX' || num || ' on ' || table_name || ' (' || columns || ')' cmd | |
| from (select table_name, | |
| constraint_name, | |
| cname1 || nvl2(cname2, ',' || cname2, null) || nvl2(cname3, ',' || cname3, null) || | |
| nvl2(cname4, ',' || cname4, null) || nvl2(cname5, ',' || cname5, null) || nvl2(cname6, ',' || cname6, null) || | |
| nvl2(cname7, ',' || cname7, null) || nvl2(cname8, ',' || cname8, null) columns, | |
| row_number() over(PARTITION by table_name order by constraint_name) num | |
| from (select b.table_name, | |
| b.constraint_name, | |
| max(decode(position, 1, column_name, null)) cname1, | |
| max(decode(position, 2, column_name, null)) cname2, | |
| max(decode(position, 3, column_name, null)) cname3, | |
| max(decode(position, 4, column_name, null)) cname4, | |
| max(decode(position, 5, column_name, null)) cname5, | |
| max(decode(position, 6, column_name, null)) cname6, | |
| max(decode(position, 7, column_name, null)) cname7, | |
| max(decode(position, 8, column_name, null)) cname8, | |
| count(*) col_cnt | |
| from (select substr(table_name, 1, 30) table_name, | |
| substr(constraint_name, 1, 30) constraint_name, | |
| substr(column_name, 1, 30) column_name, | |
| position | |
| from user_cons_columns) a, | |
| user_constraints b | |
| where a.constraint_name = b.constraint_name | |
| and b.constraint_type = 'R' | |
| group by b.table_name, | |
| b.constraint_name) cons | |
| where col_cnt > ALL (select count(*) | |
| from user_ind_columns i | |
| where i.table_name = cons.table_name | |
| and i.column_name in (cname1, cname2, cname3, cname4, cname5, cname6, cname7, cname8) | |
| and i.column_position <= cons.col_cnt | |
| group by i.index_name))) | |
| loop | |
| begin | |
| execute immediate rec.cmd; | |
| exception | |
| when others then | |
| dbms_output.put_line(rec.cmd); | |
| dbms_output.put_line(sqlerrm); | |
| end; | |
| end loop; | |
| end; | |
| / |
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