![]() ![]() SingleStore supports binary, utf8, and utf8mb4 character sets. See Advanced Columnstore Configuration Options) for more information. See Working with Geospatial Features for more information.ĬOLUMNSTORE_ SEGMENT_ ROWS, COLUMNSTORE_ FLUSH_ BYTES controls configuration variables specific to columnstore tables. RESOLUTION is specific to index on geospatial columns. The UNENFORCED index option can be used on a UNIQUE constraint to specify that the unique constraint is unenforced. It applies to rowstore hash indexes only and does not effect columnstore hash indexes. It controls the bucket count of the hash table. We recommend using SORT KEY().īUCKET_ COUNT is specific to the HASH index type. KEY() USING CLUSTERED COLUMNSTORE is a legacy syntax that is equivalent to SORT KEY(). SORT KEY() is not allowed when using CREATE ROWSTORE TABLE. | ColumnStoreScan test1.t1, KEY col1 (col1 DESC) USING CLUSTERED COLUMNSTORE table_type:sharded_columnstore | | GatherMerge partitions:all alias:remote_0 | SingleStoreDB does not support scanning a SORT KEY() in reverse order to its sort order:ĮXPLAIN SELECT * FROM t1 ORDER BY col1 +-+ The SORT KEY() order can be specified as ascending ( SORT KEY(index_ column_ name)) or descending ( SORT KEY(index_ column_ name DESC)). If you do not want to specify a column (or columns) to sort on, or do not care about the sort order for your data, you can specify an empty key (e. This index has very similar characteristics to a BTREE index. The BTREE index type creates a skip list index in SingleStoreDB Cloud. INDEX syntax is generally used when creating an index on an existing table. The KEY syntax is equivalent to using INDEX syntax when used in CREATE TABLE. See Code Generation for more information. Refer to the Database Object Case Sensitivity topic for more information.ĬREATE TABLE is slower in SingleStoreDB Cloud than in MySQL. The following note applies when the engine variable table_ name_ case_ sensitivity is set to OFF: After you create a table, you cannot create another table having the same table name with a different case. ![]() is the name of the table to create in the SingleStoreDB Cloud database. Only the set of strings that are listed for a column at the time of table creation can be inserted. The SET data type restricts the values that can be inserted for a table column. For TEMPORARY or GLOBAL TEMPORARY tables, if default_ table_ type is set to columnstore, you must use CREATE ROWSTORE TEMPORARY TABLE and CREATE ROWSTORE GLOBAL TEMPORARY TABLE to create temporary tables.įor more information about the data types listed above, and for an explanation of UNSIGNED, refer to the Data Types topic. The setting of default_ table_ type applies to temporary tables. You cannot change the value of default_ table_ type. When default_ table_ type is set to columnstore, you can create a columnstore table using standard CREATE TABLE syntax.ĭefault_ table_ type is set to columnstore for SingleStoreDB Cloudworkspaces. or SORT KEY() are specified, the value of the default_ table_ type engine variable determines the type of table ( columnstore or rowstore) that is created. Master Aggregator High Availability After Availability Zone Failure.Operations that Take Either a Database or a Workspace Level Lock.Getting Started with SingleStoreDB Cloud. ![]()
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