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.
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
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
)
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
CREATE PROCEDURE find_root
( x IN REAL )
IS LANGUAGE C
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;
