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UPDATE, DELETE, and INSERT automatically acquire this lock on the target table and add the ACCESS SHARE lock to other referenced tables. Generally, all statements that modify table data acquire the ROW EXCLUSIVE lock for tables.
my_server_1. gaussdb=# DROP SERVER my_server_1; -- Delete the user. gaussdb=# DROP USER jack; Helpful Links CREATE SERVER and DROP SERVER Parent topic: A
DML Specifies the operations that are audited in the database: SELECT, COPY, DEALLOCATE, DELETE, EXECUTE, INSERT, PREPARE, REINDEX, TRUNCATE, and UPDATE. ALL Specifies all operations supported by the specified DDL or DML statements in the database.
DML Specifies the operations that are audited in the database: SELECT, COPY, DEALLOCATE, DELETE, EXECUTE, INSERT, PREPARE, REINDEX, TRUNCATE, and UPDATE. ALL Specifies all operations supported by the specified DDL or DML statements in the database.
To delete it, you must call PQclear. Otherwise, memory leakage occurs. Example For details, see Typical Application Development Examples. Parent topic: Database Statement Execution Functions
To delete it, you must call PQclear. Otherwise, memory leakage occurs. Examples For details, see Typical Application Development Examples. Parent topic: Database Statement Execution Functions
If load balancing is enabled or a CN needs to be specified, you are advised to use the DBE_SQL_UTIL.drop_remote_sql_patch API to delete a CN.
Table 1 WORKLOAD_SQL_COUNT columns Name Type Description workload name Workload name. select_count bigint Number of SELECT statements. update_count bigint Number of UPDATE statements. insert_count bigint Number of INSERT statements. delete_count bigint Number of DELETE statements.
Table 1 WORKLOAD_SQL_COUNT columns Name Type Description workload name Workload name. select_count bigint Number of SELECT statements. update_count bigint Number of UPDATE statements. insert_count bigint Number of INSERT statements. delete_count bigint Number of DELETE statements.
To delete it, you must call PQclear. Otherwise, memory leakage occurs. Examples For details, see Typical Application Development Examples. Parent topic: Database Statement Execution Functions
To delete it, you must call PQclear. Otherwise, memory leakage occurs. Examples For details, see Typical Application Development Examples. Parent topic: Database Statement Execution Functions
In this case, you need to manually delete them.
plain | | b | character(20) | | extended | | Indexes: "ustore_table_pkey" PRIMARY KEY, ubtree (a) WITH (storage_type=USTORE) TABLESPACE pg_default Has OIDs: no Options: orientation=row, storage_type=ustore, compression=no, segment=off Delete
That is, the operation is converted into a delete operation and an insert operation. Scan: The operation is basically the same as that of RCR UB-tree.
ALTER TABLE tablename DELETE STATISTICS ((column_1, column_2)); -- Delete statistics about column_1 and column_2 of tablename or their statistics declaration. Use EXPLAIN to show the execution plan of each SQL statement.
-- Create a server. gaussdb=# CREATE SERVER my_server FOREIGN DATA WRAPPER file_fdw; -- Delete the server. gaussdb=# DROP SERVER my_server; Create another server in the homogeneous cluster, where log_fdw is the foreign data wrapper in the database. 1 2 3 4 5 6 7 8 9 10
FROM pg_prepared_statements; name | statement | parameter_types ------+------------------------------+----------------- q1 | PREPARE q1 AS SELECT 1 AS a; | {} q3 | PREPARE q3 AS SELECT 1 AS a; | {} q2 | PREPARE q2 AS SELECT 1 AS a; | {} (3 rows) -- Delete
After a view is created, you are not allowed to use REPLACE to modify column names in the view or delete the columns. Parameters OR REPLACE Redefines the view if it already exists.
ALTER TABLE tablename DELETE STATISTICS ((column_1, column_2)); -- Delete statistics about column_1 and column_2 of tablename or their statistics declaration.
After a view is created, you are not allowed to use REPLACE to modify column names in the view or delete the columns. Parameters OR REPLACE Redefines the view if it already exists.
