I am trying to query a list of hosts and extract all entries which 'dont' match.
When I use this query, it is very very slow. Matching the host with the GOODLIST.host works great and fast but when I use <> to get the hosts which DONT match, it doesnt work as expected. Am I using the wrong approach?
Hi there,
I have a hierarchical database that include 4 tables. Table A is the parent of B, B is Parent of C, C is parent of D. If I want to query everything in D that is associated with A.name, how do I do that? Thanks!
YanYan (0 Replies)
I am debugging some code and came across ? in the WHERE cause in a mysql query.
Is this possible and what situations would this be used?
SELECT ip, count
FROM table
WHERE domain=?
thanks & regards (2 Replies)
Hi there, I have a table that stores multiple records for many different servers, each of which is timestamped ... I wanted to write a query that would enable me to only output the "latest" record (based on timestamp) for each "unique" server. So for example my main table looks like this
... (3 Replies)
hello all
i have 2 columns every column in the following format
column1
2011-04-01 11:39:54
column2
2019-02-03 00:00:00
i want get difference between above data as following
2 days 11:39
how to do so ?
i tried many functions but nothing works
please advice what is the query... (6 Replies)
Hello
i have created mysql query to compare to values and get difference in percentage
as following:
SELECT file_name, 100 - ((100 * (SELECT file_count FROM xipi_files z WHERE x.file_group = z.file_group AND x.file_name = z.file_name AND z.insert_date = CURDATE( ) - INTERVAL 1 DAY)) /... (1 Reply)
Good evening
I need your help please, im new at Unix and i wanted to remove the first 5 headers for 100000 records files and then create a control file .ctl that contains the number of records and all seem to work out but when i tested at production it didnt wotk.
Here is the code:
#!... (6 Replies)
Hi All,
i have a table in mysql with the following data
Table name Test
Assettype Serial_No Status location
Mouse 123456 In Stock chennai
Mouse 98765 Allocated chennai
Keyboard ... (2 Replies)
Hello Friends,
I am using check_mysql_query plugin in nagios to query database and get output. query is working fine but output which i am getting contain query. I want to remove query from output and give custom message which will be simple and understandable.
Can you help me here with any... (5 Replies)
Discussion started by: ghpradeep
5 Replies
LEARN ABOUT PHP
mysqlnd_memcache_set
MYSQLND_MEMCACHE_SET(3) 1 MYSQLND_MEMCACHE_SET(3)mysqlnd_memcache_set - Associate a MySQL connection with a Memcache connectionSYNOPSIS
bool mysqlnd_memcache_set (mixed $mysql_connection, [Memcached $memcache_connection], [string $pattern], [callback $callback])
DESCRIPTION
Associate $mysql_connection with $memcache_connection using $pattern as a PCRE regular expression, and $callback as a notification call-
back or to unset the association of $mysql_connection.
While associating a MySQL connection with a Memcache connection, this function will query the MySQL Server for its configuration. It will
automatically detect whether the server is configured to use the InnoDB Memcache Daemon Plugin or MySQL Cluster NDB Memcache support. It
will also query the server to automatically identify exported tables and other configuration options. The results of this automatic config-
uration can be retrieved using mysqlnd_memcache_get_config(3).
PARAMETERS
o $mysql_connection
- A handle to a MySQL Server using one of the MySQL API extensions for PHP, which are PDO_MYSQL, mysqli or ext/mysql.
o $memcache_connection
- A Memcached instance with a connection to the MySQL Memcache Daemon plugin. If this parameter is omitted, then $mysql_connection
will be unassociated from any memcache connection. And if a previous association exists, then it will be replaced.
o $pattern
- A regular expression in Perl Compatible Regular Expression syntax used to identify potential Memcache-queries. The query should
have three sub patterns. The first subpattern contains the requested field list, the second the name of the ID column from the
query and the third the requested value. If this parameter is omitted or os set to NULL, then a default pattern will be used.
o $callback
- A callback which will be used whenever a query is being sent to MySQL. The callback will receive a single boolean parameter
telling if a query was sent via Memcache.
RETURN VALUES
TRUE if the association or disassociation is successful, otherwise FALSE if there is an error.
EXAMPLES
Example #1
mysqlnd_memcache_set(3) example with var_dump(3) as a simple debugging callback.
<?php
$mysqli = new mysqli("host", "user", "passwd", "database");
$memc = new Memcached();
$memc->addServer("host", 11211);
mysqlnd_memcache_set($mysqli, $memc, NULL, 'var_dump');
/* This query will be intercepted and executed via Memcache protocol */
echo "Sending query for id via Memcache: ";
$mysqli->query("SELECT f1, f2, f3 FROM test WHERE id = 1");
/* f1 is not configured as valid key field, this won't be sent via Memcache */
echo "Sending query for f1 via Memcache: ";
$mysqli->query("SELECT id FROM test WHERE f1 = 1");
mysqlnd_memcache_set($mysqli);
/* Now the regular MySQL protocol will be used */
echo "var_dump won't be invoked: ";
$mysqli->query("SELECT f1, f2, f3 WHERE id = 1");
?>
The above example will output:
Sending query for id via Memcache: bool(true)
Sending query for f1 via Memcache: bool(false)
var_dump won't be invoked:
SEE ALSO mysqlnd_memcache_get_config(3).
PHP Documentation Group MYSQLND_MEMCACHE_SET(3)