If you recall, we use
to specify storage options when creating a table in Greenplum. As you see from the create table syntax below, this is optional.
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To simplify using storage clause recursively for many tables. Now you can set this default using
The gadget spec URL could not be found CREATE TABLE Defines a new table. CREATE [[GLOBAL | LOCAL] {TEMPORARY | TEMP}] TABLE table_name ( [ { column_name data_type [ DEFAULT default_expr ] [column_constraint [ ... ] [ ENCODING ( storage_directive [,...] ) ] ] | table_constraint | LIKE other_table [{INCLUDING | EXCLUDING} {DEFAULTS | CONSTRAINTS}] ...} [, ... ] ] [column_reference_storage_directive [, …] ] ) [ INHERITS ( parent_table [, ... ] ) ] [ WITH ( storage_parameter=value [, ... ] ) [ ON COMMIT {PRESERVE ROWS | DELETE ROWS | DROP} ] [ TABLESPACE tablespace ] [ DISTRIBUTED BY (column, [ ... ] ) | DISTRIBUTED RANDOMLY ] [ PARTITION BY partition_type (column) [ SUBPARTITION BY partition_type (column) ] [ SUBPARTITION TEMPLATE ( template_spec ) ] [...] ( partition_spec ) | [ SUBPARTITION BY partition_type (column) ] [...] ( partition_spec [ ( subpartition_spec [(...)] ) ] ) where storage_parameter is: APPENDONLY={TRUE|FALSE} BLOCKSIZE={8192-2097152} ORIENTATION={COLUMN|ROW} COMPRESSTYPE={ZLIB|QUICKLZ|RLE_TYPE|NONE} COMPRESSLEVEL={0-9} FILLFACTOR={10-100} OIDS[=TRUE|FALSE] where column_constraint is: [CONSTRAINT constraint_name] NOT NULL | NULL | UNIQUE [USING INDEX TABLESPACE tablespace] [WITH ( FILLFACTOR = value )] | PRIMARY KEY [USING INDEX TABLESPACE tablespace] [WITH ( FILLFACTOR = value )] | CHECK ( expression ) and table_constraint is: [CONSTRAINT constraint_name] UNIQUE ( column_name [, ... ] ) [USING INDEX TABLESPACE tablespace] [WITH ( FILLFACTOR=value )] | PRIMARY KEY ( column_name [, ... ] ) [USING INDEX TABLESPACE tablespace] [WITH ( FILLFACTOR=value )] | CHECK ( expression ) where partition_type is: LIST | RANGE where partition_specification is: partition_element [, ...] and partition_element is: DEFAULT PARTITION name | [PARTITION name] VALUES (list_value [,...] ) | [PARTITION name] START ([datatype] 'start_value') [INCLUSIVE | EXCLUSIVE] [ END ([datatype] 'end_value') [INCLUSIVE | EXCLUSIVE] ] [ EVERY ([datatype] [number | INTERVAL] 'interval_value') ] | [PARTITION name] END ([datatype] 'end_value') [INCLUSIVE | EXCLUSIVE] [ EVERY ([datatype] [number | INTERVAL] 'interval_value') ] [ WITH ( partition_storage_parameter=value [, ... ] ) ] [column_reference_storage_directive [, …] ] [ TABLESPACE tablespace ] where subpartition_spec or template_spec is: subpartition_element [, ...] and subpartition_element is: DEFAULT SUBPARTITION name | [SUBPARTITION name] VALUES (list_value [,...] ) | [SUBPARTITION name] START ([datatype] 'start_value') [INCLUSIVE | EXCLUSIVE] [ END ([datatype] 'end_value') [INCLUSIVE | EXCLUSIVE] ] [ EVERY ([datatype] [number | INTERVAL] 'interval_value') ] | [SUBPARTITION name] END ([datatype] 'end_value') [INCLUSIVE | EXCLUSIVE] [ EVERY ([datatype] [number | INTERVAL] 'interval_value') ] [ WITH ( partition_storage_parameter=value [, ... ] ) ] [column_reference_storage_directive [, …] ] [ TABLESPACE tablespace ] where storage_parameter is: APPENDONLY={TRUE|FALSE} BLOCKSIZE={8192-2097152} ORIENTATION={COLUMN|ROW} COMPRESSTYPE={ZLIB|QUICKLZ|RLE_TYPE|NONE} COMPRESSLEVEL={0-9} FILLFACTOR={10-100} OIDS[=TRUE|FALSE] where storage_directive is: COMPRESSTYPE={ZLIB | QUICKLZ | RLE_TYPE | NONE} | COMPRESSLEVEL={0-9} | BLOCKSIZE={8192-2097152} Where column_reference_storage_directive is: COLUMN column_name ENCODING (storage_directive [, ... ] ), ... | DEFAULT COLUMN ENCODING (storage_directive [, ... ] ) The gadget spec URL could not be found APPENDONLY BLOCKSIZE CHECKSUM COMPRESSTYPE COMPRESSLEVEL ORIENTATION Note: Specify multiple storage option values as a comma separated list. Not all combinations of storage option values are valid. If the specified storage options are not valid, an error is returned. The gadget spec URL could not be found
This example ALTER DATABASE command sets the default ORIENTATION and COMPRESSTYPE table storage options for the database sachi. ALTER DATABASE sachi SET gp_default_storage_options = 'orientation=column, compresstype=rle_type' To create an append-optimized table in the sachi database with column-oriented table and RLE compression. The user needs to specify only APPENDONLY=TRUE in the WITH clause. This example gpconfig utility command sets the default storage option for a Greenplum Database system. If you set the defaults for multiple table storage options, the value must be enclosed in single quotes and then in double quotes. gpconfig -c 'gp_default_storage_options' -v "'appendonly=true, orientation=column'" This example gpconfig utility command shows the value of the parameter. The parameter value must be consistent across the Greenplum Database master and all segments. The gadget spec URL could not be found gpconfig -s 'gp_default_storage_options'
The gadget spec URL could not be found Default Database Table Distribution Policy When you create a table without distributed by clause, Greenplum chose first valid column to distribute (hash) the table data. This is the default behavior. In GPDB 4.3.4 and onward you can change this default behavior to random distribution using parameter gp_create_table_random_default_distribution. By default this parameter is set to OFF. sachi=# show gp_create_table_random_default_distribution sachi-# ; gp_create_table_random_default_distribution --------------------------------------------- off (1 row) NOTICE: Table doesn't have 'DISTRIBUTED BY' clause -- Using column named 'id' as the Greenplum Database data distribution key for this table. HINT: The 'DISTRIBUTED BY' clause determines the distribution of data. Make sure column(s) chosen are the optimal data distribution key to minimize skew. CREATE TABLE sachi=# The gadget spec URL could not be found If the value of the parameter is OFF, (the default), and the table creation command does not contain a DISTRIBUTED BY clause, Greenplum Database chooses the table distribution key based on the command. If the LIKE or INHERITS clause is specified in table creation command, the created table uses the same distribution key as the source or parent table. If the value of the parameter is set to ON, Greenplum Database follows these rules to create a table when the DISTRIBUTED BYclause is not specified: If PRIMARY KEY or UNIQUE columns are not specified, the distribution of the table is random (DISTRIBUTED RANDOMLY). Table distribution is random even if the table creation command contains the LIKE or INHERITS clause. If PRIMARY KEY or UNIQUE columns are specified, a DISTRIBUTED BY clause must also be specified. If a DISTRIBUTED BY clause is not specified as part of the table creation command, the command fails.
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