Storage

https://docs.oracle.com/cloud/latest/db112/CNCPT/logical.htm#CNCPT3000

A tablespace is a logical storage container for segments. Segments are database objects, such as tables and indexes, that consume storage space.
A segment is a set of extents allocated for a specific database object, such as a table. Each segment belongs to one and only one tablespace.
An extent is a set of logically contiguous data blocks allocated for storing a specific type of information.
One logical data block corresponds to a specific number of bytes of physical disk space, for example, 2 KB.

Tools

http://www.oracle.com/technetwork/developer-tools/index.html

User

ALTER USER hr ACCOUNT UNLOCK;
ALTER USER hr IDENTIFIED BY hr_password;

Create Table

https://docs.oracle.com/cd/B28359_01/server.111/b28310/tables003.htm#ADMIN11004 

CREATE TABLE "HR"."COUNTRIES" 
(
"COUNTRY_ID" CHAR(2 BYTE) 
    CONSTRAINT "COUNTRY_ID_NN" NOT NULL ENABLE,


https://docs.oracle.com/cd/B19306_01/server.102/b14200/clauses002.htm

"COUNTRY_NAME" VARCHAR2(40 BYTE), 
"REGION_ID" NUMBER, 
    CONSTRAINT "COUNTRY_C_ID_PK" PRIMARY KEY ("COUNTRY_ID") ENABLE, 
    CONSTRAINT "COUNTR_REG_FK" FOREIGN KEY ("REGION_ID")


    REFERENCES "HR"."REGIONS" ("REGION_ID") ENABLE


) 
ORGANIZATION INDEX -- index-organized table.

ORGANIZATION: the order in which the data rows of the table are stored. - HEAP: the data rows of table are stored in no particular order. This is the default. - INDEX: table is created as an index-organized table. In an index-organized table, the data rows are held in an index defined on the primary key for the table. - EXTERNAL: table is a read-only table located outside the database.

NOCOMPRESS -- whether to compress data segments to reduce disk use
PCTFREE 10 -- NOCOMPRESS use the PCTFREE default value of 10, to maximize compress while still allowing for some future DML changes to the data
INITRANS 2 -- Specify the initial number of concurrent transaction entries allocated within each data block allocated to the database object.
MAXTRANS 255 --  deprecated.
LOGGING -- a database object will be logged in the redo log file

https://docs.oracle.com/cd/B28359_01/server.111/b28286/clauses.htm#SQLRF021

STORAGE(
    INITIAL 65536 -- the size of the first extent of the object. allocates space when you create the schema object.
    NEXT 1048576 -- in bytes the size of the next extent to be allocated to the object.
    MINEXTENTS 1 -- In locally managed tablespaces, determine the initial segment size in conjunction with PCTINCREASE, INITIAL and NEXT
    MAXEXTENTS 2147483645 -- valid only for objects in dictionary-managed tablespaces
    PCTINCREASE 0 -- Oracle recommends a setting of 0 as a way to minimize fragmentation and avoid the possibility of very large temporary segments during processing.
    FREELISTS 1 -- each free list group contains one free list
    FREELIST GROUPS 1 -- In tablespaces with manual segment-space management, statically partition the segment free space in an Oracle Real Application Clusters environment.
    BUFFER_POOL DEFAULT 
    FLASH_CACHE DEFAULT 
    CELL_FLASH_CACHE DEFAULT
)


https://docs.oracle.com/cd/B28359_01/server.111/b28286/clauses009.htm#SQLRF30013

TABLESPACE "USERS" 
PCTTHRESHOLD 50;  -- when an overflow segment is being used, defines the maximum size of the portion of the row that is stored in the index block, as a percentage of block size. 1–50. The default is 50.

Create Procedure

https://docs.oracle.com/cd/B19306_01/server.102/b14200/statements_6009.htm 

CREATE PROCEDURE find_root
( x IN REAL ) 
IS LANGUAGE C

Use the call_spec to map a Java or C method name, parameter types, and return type to their SQL counterparts.

    NAME c_find_root
    LIBRARY c_utils
    PARAMETERS ( x BY REFERENCE );


create or replace PROCEDURE add_job_history
(  p_emp_id          job_history.employee_id%type
, p_start_date      job_history.start_date%type
, p_end_date        job_history.end_date%type
, p_job_id          job_history.job_id%type
, p_department_id   job_history.department_id%type
)
IS
BEGIN
INSERT INTO job_history (employee_id, start_date, end_date, job_id, department_id)
    VALUES(p_emp_id, p_start_date, p_end_date, p_job_id, p_department_id);
END add_job_history;