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sql_range_partitions.html
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sql_range_partitions.html
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<h1>common_schema</h1> <strong>2.2</strong> documentation
<div class="subtitle">DBA's framework for MySQL</div>
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<h2><a href="sql_range_partitions.html">sql_range_partitions</a></h2>
<h3>NAME</h3>
sql_range_partitions: Generate SQL statements for managing range partitions
<h3>TYPE</h3>
View
<h3>DESCRIPTION</h3>
<p></p>
<p>
<i>sql_range_partitions</i> provides with SQL statements to create/drop
partitions in a <strong>RANGE</strong> or <strong>RANGE COLUMNS</strong> partitioned table
</p>
<p>
It generates the <strong>DROP PARTITION</strong> statement required to drop the oldest
partition, and the <strong>ADD PARTITION</strong> or <strong>REORGANIZE PARTITION</strong>
statement for generating the next partition in sequence.
</p>
<p>
This view auto-deduces the "next in sequence" partition value. It handles consistent
partitioning schemes, where the interval of values between partitions makes some sense.
Such an interval can be a constant value, but can also be a time-based interval.
</p>
<p>
The view supports MySQL <strong>5.1</strong> as well as <strong>5.5</strong>.
<strong>5.1</strong> requires an integer partitioning key, thereby forcing users to
convert such values as timestamps to integers via <strong>UNIX_TIMESTAMP()</strong>,
<strong>TO_DAYS()</strong> etc. <i>sql_range_partitions</i> reverse engineers this
conversion so as to compute the next in sequence <strong>LESS THAN</strong> value.
</p>
<p>
It handles views with a <strong>LESS THAN MAXVALUE</strong> partition by reorganizing
such partition into a "normal" partition followed by a new
<strong>LESS THAN MAXVALUE</strong> one.
</p>
<h3>STRUCTURE</h3>
<blockquote><pre>
mysql> DESC sql_range_partitions;
+--------------------------+---------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+--------------------------+---------------+------+-----+---------+-------+
| table_schema | varchar(64) | NO | | | |
| table_name | varchar(64) | NO | | | |
| count_partitions | bigint(21) | NO | | 0 | |
| count_past_partitions | decimal(23,0) | YES | | NULL | |
| count_future_partitions | decimal(23,0) | YES | | NULL | |
| has_maxvalue | decimal(23,0) | YES | | NULL | |
| sql_drop_first_partition | varchar(284) | YES | | NULL | |
| sql_add_next_partition | longblob | YES | | NULL | |
+--------------------------+---------------+------+-----+---------+-------+
</pre></blockquote>
<h3>SYNOPSIS</h3>
<p>Columns of this view:</p>
<ul>
<li><strong>table_schema</strong>: schema of partitioned table table</li>
<li><strong>table_name</strong>: table partitioned by <strong>RANGE</strong> or <strong>RANGE COLUMNS</strong></li>
<li><strong>count_partitions</strong>: number of partitions in table</li>
<li><strong>count_past_partitions</strong>: in the case partitions are recognized to be by
some temporal representation, the number of partitions that are in the past.</li>
<li><strong>count_future_partitions</strong>: in the case partitions are recognized to be by
some temporal representation, the number of partitions that are in the future (including NOW).</li>
<li><strong>has_maxvalue</strong>: <strong>1</strong> is the table has a
<strong>LESS THAN MAXVALUE</strong> partition, <strong>0</strong> otherwise.</li>
<li><strong>sql_drop_first_partition</strong>:
A SQL statement which drops the first partition.
<br/>Use with <a href="eval.html">eval()</a> to apply query.
</li>
<li><strong>sql_add_next_partition</strong>:
A SQL statement which adds the "next in sequence" partition.
<br/>Use with <a href="eval.html">eval()</a> to apply query.
</li>
</ul>
<p>The SQL statements are not terminated by ';'.</p>
<h3>EXAMPLES</h3>
<p>Show drop/reorganize statements for a partitioned table with <strong>MAXVALUE</strong> partition:</p>
<blockquote><pre>mysql> CREATE TABLE test.quarterly_report_status (
report_id INT NOT NULL,
report_status VARCHAR(20) NOT NULL,
report_updated TIMESTAMP NOT NULL
)
PARTITION BY RANGE (UNIX_TIMESTAMP(report_updated)) (
PARTITION p0 VALUES LESS THAN (UNIX_TIMESTAMP('2008-01-01 00:00:00')),
PARTITION p1 VALUES LESS THAN (UNIX_TIMESTAMP('2008-04-01 00:00:00')),
PARTITION p2 VALUES LESS THAN (UNIX_TIMESTAMP('2008-07-01 00:00:00')),
PARTITION p3 VALUES LESS THAN (UNIX_TIMESTAMP('2008-10-01 00:00:00')),
PARTITION p4 VALUES LESS THAN (UNIX_TIMESTAMP('2009-01-01 00:00:00')),
PARTITION p5 VALUES LESS THAN (UNIX_TIMESTAMP('2009-04-01 00:00:00')),
PARTITION p6 VALUES LESS THAN (MAXVALUE)
);
mysql> SELECT * FROM sql_range_partitions WHERE table_name='quarterly_report_status' \G
*************************** 1. row ***************************
table_schema: test
table_name: quarterly_report_status
count_partitions: 7
count_past_partitions: 6
count_future_partitions: 0
has_maxvalue: 1
sql_drop_first_partition: alter table `test`.`quarterly_report_status` drop partition `p0`
sql_add_next_partition: alter table `test`.`quarterly_report_status` reorganize partition `p6` into (partition `p_20090701000000` values less than (1246395600) /* 2009-07-01 00:00:00 */ , partition p_maxvalue values less than MAXVALUE)
</pre></blockquote>
<p>
The above query was issued in the year <strong>2013</strong>, and so all partitions
are considered as <i>in the past</i>. The <strong>MAXVALUE</strong> partition is considered
neither as past nor future (although it will contain any future rows). This is so that
<strong>count_future_partitions</strong> makes for the number of partitions strictly
specifying future dates.
</p>
<p>Add next partition:</p>
<blockquote><pre>mysql> call eval("SELECT sql_add_next_partition FROM sql_range_partitions WHERE table_name='quarterly_report_status'");
mysql> SHOW CREATE TABLE test.quarterly_report_status \G
Create Table: CREATE TABLE `quarterly_report_status` (
`report_id` int(11) NOT NULL,
`report_status` varchar(20) NOT NULL,
`report_updated` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
) ENGINE=MyISAM DEFAULT CHARSET=utf8
/*!50100 PARTITION BY RANGE (UNIX_TIMESTAMP(report_updated))
(PARTITION p0 VALUES LESS THAN (1199138400) ENGINE = MyISAM,
PARTITION p1 VALUES LESS THAN (1206997200) ENGINE = MyISAM,
PARTITION p2 VALUES LESS THAN (1214859600) ENGINE = MyISAM,
PARTITION p3 VALUES LESS THAN (1222808400) ENGINE = MyISAM,
PARTITION p4 VALUES LESS THAN (1230760800) ENGINE = MyISAM,
PARTITION p5 VALUES LESS THAN (1238533200) ENGINE = MyISAM,
PARTITION p_20090701000000 VALUES LESS THAN (1246395600) ENGINE = MyISAM,
PARTITION p_maxvalue VALUES LESS THAN MAXVALUE ENGINE = MyISAM) */
</pre></blockquote>
<h3>ENVIRONMENT</h3>
MySQL 5.1 or newer
<h3>SEE ALSO</h3>
<a href="eval.html">eval()</a>,
<a href="sql_foreign_keys.html">sql_foreign_keys</a>
<h3>AUTHOR</h3>
Shlomi Noach
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