05-13-2013
Insert Command Creating Table Locking Problem
Hi,
i have a java based tool which does insert operation in a TABLE, and in parallel the same table is used by my C++ code which does select Query.
the Table will be always busy, but sometimes the table is getting locked when i try to make an insert, am bit confused whether the lock is because of SELECT query from my C++ code or by the INSERT QUERY from the java Tool.
Do i need to modify the Query if so how..? and from the google i learnt that select puts an internal LOCK.
currently am locking the table before insert below is my query
lock table table_name in exclusive mode nowait
and giving a commit after performing the DML operation so that lock will be removed automatically.
can anyone please solve my query.?
thanks,
senthil
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LEARN ABOUT REDHAT
insert
INSERT(7) SQL Commands INSERT(7)
NAME
INSERT - create new rows in a table
SYNOPSIS
INSERT INTO table [ ( column [, ...] ) ]
{ DEFAULT VALUES | VALUES ( { expression | DEFAULT } [, ...] ) | SELECT query }
INPUTS
table The name (optionally schema-qualified) of an existing table.
column The name of a column in table.
DEFAULT VALUES
All columns will be filled by null values or by values specified when the table was created using DEFAULT clauses.
expression
A valid expression or value to assign to column.
DEFAULT
This column will be filled in by the column DEFAULT clause, or NULL if a default is not available.
query A valid query. Refer to the SELECT statement for a further description of valid arguments.
OUTPUTS
INSERT oid 1
Message returned if only one row was inserted. oid is the numeric OID of the inserted row.
INSERT 0 #
Message returned if more than one rows were inserted. # is the number of rows inserted.
DESCRIPTION
INSERT allows one to insert new rows into a table. One can insert a single row at a time or several rows as a result of a query. The col-
umns in the target list may be listed in any order.
Each column not present in the target list will be inserted using a default value, either a declared DEFAULT value or NULL. PostgreSQL will
reject the new column if a NULL is inserted into a column declared NOT NULL.
If the expression for each column is not of the correct data type, automatic type coercion will be attempted.
You must have insert privilege to a table in order to append to it, as well as select privilege on any table specified in a WHERE clause.
USAGE
Insert a single row into table films:
INSERT INTO films VALUES
('UA502','Bananas',105,'1971-07-13','Comedy',INTERVAL '82 minute');
In this second example the last column len is omitted and therefore it will have the default value of NULL:
INSERT INTO films (code, title, did, date_prod, kind)
VALUES ('T_601', 'Yojimbo', 106, DATE '1961-06-16', 'Drama');
In the third example, we use the DEFAULT values for the date columns rather than specifying an entry.
INSERT INTO films VALUES
('UA502','Bananas',105,DEFAULT,'Comedy',INTERVAL '82 minute');
INSERT INTO films (code, title, did, date_prod, kind)
VALUES ('T_601', 'Yojimbo', 106, DEFAULT, 'Drama');
Insert a single row into table distributors; note that only column name is specified, so the omitted column did will be assigned its
default value:
INSERT INTO distributors (name) VALUES ('British Lion');
Insert several rows into table films from table tmp:
INSERT INTO films SELECT * FROM tmp;
Insert into arrays (refer to the PostgreSQL User's Guide for further information about arrays):
-- Create an empty 3x3 gameboard for noughts-and-crosses
-- (all of these queries create the same board attribute)
INSERT INTO tictactoe (game, board[1:3][1:3])
VALUES (1,'{{"","",""},{},{"",""}}');
INSERT INTO tictactoe (game, board[3][3])
VALUES (2,'{}');
INSERT INTO tictactoe (game, board)
VALUES (3,'{{,,},{,,},{,,}}');
COMPATIBILITY
SQL92
INSERT is fully compatible with SQL92. Possible limitations in features of the query clause are documented for SELECT [select(7)].
SQL - Language Statements 2002-11-22 INSERT(7)