What is the syntax to create segments?

Hello

segment can be created manually as table space? If Yes, what is the syntax to create the segment?

Concerning

The create table statement has a storage clause that is part of the clause of physical attributes.

These clauses to define options for the creation of segment/measure. If you do not specify the storage clause, then the tablespace-level settings are used.

Documentation of the CREATE TABLE statement

Physical properties: https://docs.oracle.com/database/121/SQLRF/statements_7002.htm#i2126711

{[deferred_segment_creation] [table_compression] segment_attributes_clause}

[inmemory_table_clause] [ilm_clause]

| [deferred_segment_creation] ORGANIZATION

{Heap_org_table_clause BUNCH [segment_attributes_clause]

| INDEX index_org_table_clause [segment_attributes_clause]

| External_table_clause EXTERNAL

}

| CLUSTER cluster (column [, column]...)

Segment attributes clause: https://docs.oracle.com/database/121/SQLRF/statements_7002.htm#i2214991

{physical_attributes_clause

| TABLESPACE tablespace

| logging_clause

}...

{Clause of their physical characteristics: https://docs.oracle.com/database/121/SQLRF/clauses007.htm#SQLRF30011}

[{ PCTFREE whole

| Whole PCTUSED

| INITRANS whole

| storage_clause

}...

]

Term of storage: https://docs.oracle.com/database/121/SQLRF/clauses009.htm#CJACEJGB


STORAGE

({ INITIAL size_clause

| Size_clause NEXT

| MINEXTENTS whole

| MAXEXTENTS {integer |} UNLIMITED }

| maxsize_clause

| PCTINCREASE whole

| Whole FREELISTS

| FREELIST GROUPS around

| OPTIMAL [size_clause |] NULL ]

| USER_TABLES { KEEP |} RECYCLE | DEFAULT }

| FLASH_CACHE { KEEP |} NO | DEFAULT }

| ENCRYPT

} ...

)

However, the create table statement lets you not create segments or extensions directly. New extensions are to be created initially (when the table is created) or later, when more space is needed for the table, usually after several insertions that filled the original measure.

Also remember that SQL is a language of generation 4. But there is no need to go into details such as the management of use or storage. All that and managed by the RDBMS.

Tags: Database

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