ORA-12899: Value too large for column "%s"."%s"."%s" (actual: %d, maximum: %d) The value you are trying to insert into a column is too long.
eg:
SQL> create table test(n varchar2(1));
Table created.
SQL> insert into test values ('a');
1 row created.
SQL> insert into test values ('aa');
insert into test values ('aa')
*
ERROR at line 1:
ORA-12899: value too large for column "ME"."TEST"."N" (actual: 2, maximum: 1)
It can happen that the character you are trying to insert looks like there should be no problem:
SQL> desc test
Name Null? Type
----------------------------------------- -------- -----------
N VARCHAR2(1)
SQL> insert into test values ('?');
insert into test values ('?')
*
ERROR at line 1:
ORA-12899: value too large for column "ME"."TEST"."N" (actual: 3, maximum: 1)
This can happen due to the characterset the database is running in.
In a AL32UTF8 (unicode) database, some characters take more then 1 byte.
If you do not specify at create time what unit the size for a column is in, default it means the amount of bytes.
In our example, the ? will take 3 bytes due to the fact we are in a Unicode database and will cause the error.
SQL> select value from nls_database_parameters where parameter='NLS_CHARACTERSET';
VALUE
--------------------------------------------------------------------------------
AL32UTF8
We can fix this by telling that the size is in CHAR's instead of BYTE's:
SQL> alter table test modify(n varchar2(1 char));
Table altered.
SQL> desc test
Name Null? Type
----------------------------------------- -------- -----------------
N VARCHAR2(1 CHAR)
SQL> insert into test values ('?');
1 row created.
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