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- CREATE DATABASE/SCHEMA, TABLE, VIEW, FUNCTION, INDEX
- DROP DATABASE/SCHEMA, TABLE, VIEW, INDEX
- TRUNCATE TABLE
- ALTER DATABASE/SCHEMA, TABLE, VIEW
- MSCK REPAIR TABLE (or ALTER TABLE RECOVER PARTITIONS)
- SHOW DATABASES/SCHEMAS, TABLES, TBLPROPERTIES, PARTITIONS, FUNCTIONS, INDEX[ES], COLUMNS, CREATE TABLE
- DESCRIBE DATABASE/SCHEMA, table_name, view_name
PARTITION statements are usually options of TABLE statements, except for SHOW PARTITIONS.
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Alter Database
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ALTER (DATABASE|SCHEMA) database_name SET DBPROPERTIES (property_name=property_value, ...); ALTER (DATABASE|SCHEMA) database_name SET OWNER [USER|ROLE] user_or_role; -- (Note: Hive 0.13.0 and later) |
The uses of SCHEMA and DATABASE are interchangeable – they mean the same thing. CREATE DATABASE was added in Hive Hive 0.14 (HIVE-6601)
No other metadata about a database can be changed.
Currently the SCHEMA keyword cannot be used as an alternative for DATABASE (see HIVE-6601).
Use Database
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USE database_name; USE DEFAULT; |
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These statements provide a way to query the Hive metastore for existing data and metadata accessible to this Hive system. Show Databases
SHOW DATABASES lists all of the databases defined in the metastore. The optional LIKE clause allows the list of databases to be filtered using a regular expression. Wildcards in the regular expression can only be '*' for any character(s) or '|' for a choice. Examples are 'employees', 'emp*', 'emp*|*ees', all of which will match the database named 'employees'. Show Tables/Partitions/IndexesShow Tables
Show Partitions
SHOW PARTITIONS lists all the existing partitions for a given base table. Partitions are listed in alphabetical order.
It is also possible to specify parts of a partition specification to filter the resulting list. For example:
Example:
Show Table/Partition Extended
SHOW TABLE EXTENDED will list information for all tables matching the given regular expression. Users cannot use regular expression for table name if a partition specification is present. This command's output includes basic table information and file system information like totalNumberFiles, totalFileSize, maxFileSize, minFileSize,lastAccessTime, and lastUpdateTime. If partition is present, it will output the given partition's file system information instead of table's file system information. Show Table Properties
The first form lists all of the table properties for the table in question one per row separated by tabs. The second form of the command prints only the value for the property that's being asked for. Show Create Table
SHOW CREATE TABLE shows the CREATE TABLE statement that creates a given table, or the CREATE VIEW statement that creates a given view. Show Indexes
SHOW INDEXES shows all of the indexes on a certain column, as well as information about them: index name, table name, names of the columns used as keys, index table name, index type, and comment. If the FORMATTED keyword is used, then column titles are printed for each column. Show Columns
SHOW COLUMNS shows all the columns in a table including partition columns. Show Functions
SHOW FUNCTIONS lists all the user defined and builtin functions matching the regular expression. To get all functions use ".*" Show Granted Roles and PrivilegesHive Default Authorization - Legacy Mode has information about these SHOW statements: In Hive 0.13.0 and later releases, SQL standard based authorization has these SHOW statements: Show Locks
SHOW LOCKS displays the locks on a table or partition. See Hive Concurrency Model for information about locks. SHOW (DATABASE|SCHEMA) is supported from Hive 0.13 (see HIVE-2093). SCHEMA and DATABASE are interchangeable – they mean the same thing. CREATE DATABASE was added in Hive Hive 0.14 (HIVE-6601) When Hive transactions are being used, SHOW LOCKS returns this information (see HIVE-6460):
Show Transactions
SHOW TRANSACTIONS is for use by administrators when Hive transactions are being used. It returns a list of all currently open and aborted transactions in the system, including this information:
Show Compactions
SHOW COMPACTIONS returns a list of all tables and partitions currently being compacted or scheduled for compaction when Hive transactions are being used, including this information:
Compactions are initiated automatically, but can also be initiated manually with an ALTER TABLE COMPACT statement. |
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