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-¸¶Ê¸ºÇ½ª¹¹¿·Æü: Last updated: Fri Sep 14 14:39:54 EDT 2007
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-Maintainer of Japanese Translation: Jun Kuwamura (juk at PostgreSQL.jp)
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-<p>¸¶Ê¸ºÇ½ª¹¹¿·Æü: Last updated: Fri Sep 14 14:39:54 EDT 2007</p>
+<p>¸¶Ê¸ºÇ½ª¹¹¿·Æü: Last updated: Tue Oct 9 16:13:00 EDT 2007</p>
<p>¸½ºß¤Î°Ý»ý´ÉÍý¼Ô: Bruce Momjian (<A
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Maintainer of Japanese Translation: Jun Kuwamura (<A
-href="mailto:juk at PostgreSQL.jp">juk at PostgreSQL.jp</a>)<br /></p>
+href="mailto:juk at postgresql.jp">juk at postgresql.jp</a>)<br /></p>
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ÃΤ뤳¤È¤¬¤Ç¤¤Ê¤¤¤«¤é¤Ç¤¹¡£¤³¤Î¤è¤¦¤Ê¾ì¹ç¡¢<pre>LIKE</pre>¥¤¥ó
¥Ç¥¯¥·¥ó¥°¤Ë¤À¤±Æ¯¤¯¤è¤¦¤Ê¡¢ÆÃÊ̤Ê<pre>text_pattern_ops</pre>¥¤
- ¥ó¥Ç¥Ã¥¯¥¹¤òºîÀ®¤¹¤ë¤³¤È¤â¤Ç¤¤Þ¤¹¡£
+ ¥ó¥Ç¥Ã¥¯¥¹¤òºîÀ®¤¹¤ë¤³¤È¤â¤Ç¤¤Þ¤¹¡£¤Þ¤¿¡¢¤½¤ì¤òÁ´Ê¸¸¡º÷¤Î¥Õ¥ë
+ ¥Æ¥¥¹¥È¤Î¥¤¥ó¥Ç¥Ã¥¯¥¹ºîÀ®¤Ë»È¤¦¤³¤È¤¬¤Ç¤¤Þ¤¹¡£
</li>
</ul>
<p>
- <p>8.0¤è¤êÁ°¤Î¥ê¥ê¡¼¥¹¤Ç¤Ï¡¢¥¤¥ó¥Ç¥Ã¥¯¥¹¤Ï¡¢¥Ç¡¼¥¿·¿¤¬¤Á¤ç¤¦¤É¥¤¥ó¥Ç¥Ã
- ¥¯¥¹¤Î¥«¥é¥à¤Î·¿¤È°ìÃפ·¤Ê¤±¤ì¤Ð¡¢»È¤¨¤Ê¤¤¤³¤È¤¬¤·¤Ð¤·¤Ð¤¢¤ê¤Þ¤·¤¿¡£
- ¤ª¤½¤é¤¯¡¢int2, int8, ¤ª¤è¤Ó numeric Åù¤Î¥«¥é¥à¤Î¥¤¥ó¥Ç¥Ã¥¯¥¹¤¬¤½¤¦
- ¤Ç¤¹¡£</p>
-
<h4 id="ITEM4.7">4.7</a>) Ì䤤¹ç¤ï¤»¥ª¥×¥Æ¥£¥Þ¥¤¥¶¤¬¤É¤Î¤è¤¦¤ËÌ䤤¹ç¤ï¤»¤òɾ²Á¤¹¤ë¤Î¤«¤ò¸«¤ë¤Ë¤Ï¤É¤¦¤·¤Þ¤¹¤«¡©</h4>
]
</small></pre></p>
- ÄÌÈ֤ˤĤ¤¤Æ¤Î¤â¤Ã¤È¾Ü¤·¤¤¾ðÊó¤Ï¡¢¥ª¥ó¥é¥¤¥ó¥Þ¥Ë¥å¥¢¥ë¤Ç
- <i>create_sequence</i> ¤ò¤´¤é¤ó¤¯¤À¤µ¤¤¡£
+ <p>¼«Æ°Åª¤ËÀ¸À®¤µ¤ì¤ëÄÌÈ֤ϡ¢
+ <<i>table</i>>_<<i>serialcolumn</i>>_<i>seq</i>
+ ¤È̾ÉÕ¤±¤é¤ì¤Æ¤¤¤Æ¡¢<i>table</i> ¤È <i>serialcolumn</i> ¤Ï¡¢¤½¤ì¤¾¤ì
+ ¥Æ¡¼¥Ö¥ë¤È <small>SERIAL</small> ¥«¥é¥à¤Î̾Á°¤Ç¤¹¡£
+ ÄÌÈ֤ˤĤ¤¤Æ¤Ï¡¢¥ª¥ó¥é¥¤¥ó¥Þ¥Ë¥å¥¢¥ë¤Ç<i>create_sequence</i>
+ ¤ò¤´¤é¤ó¤¯¤À¤µ¤¤¡£</p>
<h4 id="item4.11.2">4.11.2</a>) <small>SERIAL</small>¥Ç¡¼¥¿·¿¤ËÁÞÆþ¤µ¤ì¤ëÃͤϡ¢¤É¤¦¤¹¤ì¤ÐÆÀ¤é¤ì¤Þ¤¹¤«¡©</h4>
- <p>¤Ò¤È¤Ä¤ÎÊýË¡¤Ï¡¢<i>nextval()</i> ´Ø¿ô¤ò»È¤Ã¤Æ¤½¤ÎÃͤòÁÞÆþ¤¹¤ë<i>
- Á°(before)¤Ë</i> SEQUENCE ¥ª¥Ö¥¸¥§¥¯¥È¤«¤é¼¡¤Î <small>SERIAL</small>
- Ãͤò¼è¤ê½Ð¤·¡¢¤½¤ì¤«¤é¼ÂºÝ¤ËÁÞÆþ¤ò¤¹¤ë¤³¤È¤Ç¤¹¡£<a
- href="#item4.11.1">4.11.1</a> ¤Î¥Æ¡¼¥Ö¥ë¤ÎÎã¤ò»È¤¦¤È¤¹¤ë¤È¡¢µ¿»÷¸À¸ì¤Ç¤Ï
- ¤³¤Î¤è¤¦¤Ë¤Ê¤ê¤Þ¤¹¡£</p>
-
-<pre>
- new_id = execute("SELECT nextval('person_id_seq')");
- execute("INSERT INTO person (id, name) VALUES (new_id, 'Blaise Pascal')");
-</pre>
-
- ¤½¤¦¤·¤Æ¡¢<tt>new_id</tt> ¤ËÊݸ¤·¤¿¿·¤·¤¤Ãͤò¾¤Î¥¯¥¨¥ê(¤¿¤È¤¨¤Ð¡¢
- <tt>person</tt> ¥Æ¡¼¥Ö¥ë¤ËÂФ¹¤ë³°Éô¥¡¼(foreign key)¤Î¤è¤¦¤Ë)»È¤¦¤È
- ¤è¤¤¤Ç¤·¤ç¤¦¡£¼«Æ°Åª¤Ëºî¤é¤ì¤¿<small>SEQUENCE</small>¥ª¥Ö¥¸¥§¥¯¥È¤Î
- ̾Á°¤Ï¡¢<<i>table</i>>_<<i>serialcolumn</i>>_<i>seq</i>
- ¤Î¤è¤¦¤Ë¤Ê¤ê¡¢¤³¤Î¤¦¤Á¡¢<i>table</i> ¤È <i>serialcolumn</i> ¤Ï¤½¤ì¤¾
- ¤ì¥Æ¡¼¥Ö¥ë¤Î̾Á°¤È<small>SERIAL</small>¥«¥é¥à¤Î̾Á°¤Ç¤¹¡£
-
- <p>¤¢¤ë¤¤¤Ï¡¢Í¿¤¨¤é¤ì¤¿<small>SERIAL</small>Ãͤò¡¢¤½¤ì¤¬´ûÄêÃͤȤ·¤Æ
- ÁÞÆþ¤µ¤ì¤¿<i>¸å¤Ç(after)</i>¡¢ <i>currval()</i> ´Ø¿ô¤ò»È¤Ã¤Æ¼è¤ê½Ð¤¹
- ¤³¤È¤â¤Ç¤¤Þ¤¹¡£¤¿¤È¤¨¤Ð¡¢ </p>
+ <p>ºÇ¤â´Êñ¤ÊÊýË¡¤Ï¡¢³ä¤êÅö¤Æ¤é¤ì¤¿<small>SERIAL</small>Ãͤò
+ <small>RETURNING</small>¤È¤·¤Æ¼èÆÀ¤¹¤ë¤³¤È¤Ç¤¹¡£
+ <a href="#item4.11.1">4.11.1</a>¤ÎÎãÂê¥Æ¡¼¥Ö¥ë¤ò»È¤¦¤È¼¡¤Î¤è¤¦¤Ë
+ ¤Ê¤ê¤Þ¤¹¡£
<pre>
- execute("INSERT INTO person (name) VALUES ('Blaise Pascal')");
- new_id = execute("SELECT currval('person_id_seq')");
+ INSERT INTO person (name) VALUES ('Blaise Pascal') RETURNING id;
</pre>
<p>¤ª¤½¤é¤¯¡¢¥·¥¹¥Æ¥à¤Î²¾ÁÛ¥á¥â¥ê¡¼¤òÁ´¤Æ»È¤¤²Ì¤¿¤·¤Æ¤·¤Þ¤Ã¤Æ¤¤¤ë²Ä
ǽÀ¤¬¤¢¤ë¤«¡¢¥«¡¼¥Í¥ë¤¬¤¢¤ë¥ê¥½¡¼¥¹¤Ë¤Ä¤¤¤Æ¤â¤ÄÀ©¸ÂÃͤ¬Ä㤹¤®¤ë²Äǽ
- À¤¬¤¢¤ê¤Þ¤¹¡£<i>postmaster</i> ¤ò»ÏÆ°¤¹¤ëÁ°¤Ë¤³¤ì¤ò»î¤·¤Æ¤ß¤Æ¤¯¤À¤µ¤¤¡§</p>
+ À¤¬¤¢¤ê¤Þ¤¹¡£¥µ¡¼¥Ð¤ò»ÏÆ°¤¹¤ëÁ°¤Ë¤³¤ì¤ò»î¤·¤Æ¤ß¤Æ¤¯¤À¤µ¤¤¡§</p>
<pre>
ulimit -d 262144
¤ò»È¤¦¤È´Êñ¤Ç¤¹</p>¡£
-<h4 id="item4.19">4.19</a>) PL/PgSQL ¤Î´Ø¿ô¤ÎÃæ¤Ç°ì»þ¥Æ¡¼¥Ö¥ë¤Ë¥¢¥¯¥»¥¹¤¹¤ë¤È¤¡¢¤É¤¦¤·¤Æ "relation with OID ##### does not exist" ¤È¤¤¤¦¥¨¥é¡¼¤ò¼õ¤±¼è¤ë¤Î¤Ç¤·¤ç¤¦¤«¡©</h4>
-
- <p>PL/PgSQL ¤Ï´Ø¿ô¥¹¥¯¥ê¥×¥È¤ò¥¥ã¥Ã¥·¥å¤·¡¢ÉÔ¹¬¤Ë¤â¤½¤ÎÉûºîÍѤǡ¢
- PL/PgSQL´Ø¿ô¤¬°ì»þ¥Æ¡¼¥Ö¥ë¤Ë¥¢¥¯¥»¥¹¤¹¤ë¾ì¹ç¡¢¸å¤Ç¤½¤Î¥Æ¡¼¥Ö¥ë¤ò¾Ã¤·
- ¤Æºî¤ê¤Ê¤ª¤µ¤ì¡¢´Ø¿ô¤¬¤â¤¦°ìÅٸƤӽФµ¤ì¤ë¤È¡¢¤½¤Î´Ø¿ô¤Ï¥¥ã¥Ã¥·¥å¤·
- ¤Æ¤¤¤ë´Ø¿ô¤ÎÆâÍƤϤޤÀ¸Å¤¤°ì»þ¥Æ¡¼¥Ö¥ë¤òº¹¤·¼¨¤·¤¿¤Þ¤Þ¤À¤«¤é¤Ç¤¹¡£
- ¤³¤Î¡¢²ò·èºö¤È¤·¤Æ¡¢PL/PgSQL¤ÎÃæ¤Ç <small>EXECUTE</small> ¤ò°ì»þ¥Æ¡¼
- ¥Ö¥ë¤Ø¤Î¥¢¥¯¥»¥¹¤Î¤¿¤á¤Ë»È¤¤¤Þ¤¹¡£¤½¤¦¤¹¤ë¤È¡¢¥¯¥¨¥ê¤ÏËè²ó¥Ñ¡¼¥¹¤ò¤ä
- ¤êľ¤·¤µ¤ì¤ë¤è¤¦¤Ë¤Ê¤ê¤Þ¤¹¡£</p>
-
-<h4 id="item4.20">4.20</a>) ¤É¤Î¤è¤¦¤Ê¥ì¥×¥ê¥±¡¼¥·¥ç¥ó¤Î¥½¥ê¥å¡¼¥·¥ç¥ó¤¬¤¢¤ê¤Þ¤¹¤«¡©</h4>
+<h4 id="item4.19">4.19</a>) ¤É¤Î¤è¤¦¤Ê¥ì¥×¥ê¥±¡¼¥·¥ç¥ó¤Î¥½¥ê¥å¡¼¥·¥ç¥ó¤¬¤¢¤ê¤Þ¤¹¤«¡©</h4>
<p>¡Ö¥ì¥×¥ê¥±¡¼¥·¥ç¥ó¡×¤È°ì¸À¤Ç¤¤¤¤¤Þ¤¹¤¬¡¢¥ì¥×¥ê¥±¡¼¥·¥ç¥ó¤ò¤¹¤ë
¤¿¤á¤Îµ»½Ñ¤Ï¤¤¤¯¤Ä¤«¤¢¤ê¡¢¤½¤ì¤¾¤ì¡¢ÍøÅÀ¤È·çÅÀ¤¬¤¢¤ê¤Þ¤¹¡£</p>
<p>¤³¤Î¾¤Ë¤â¡¢¾¦ÍѤä¥Ï¡¼¥É¥¦¥§¥¢¡Ý¥Ù¡¼¥¹¤Î¥ì¥×¥ê¥±¡¼¥·¥ç¥ó¥½¥ê¥å¡¼
¥·¥ç¥ó¤¬¤¤¤í¤¤¤í¤Ê¥ì¥×¥ê¥±¡¼¥·¥ç¥ó¥â¥Ç¥ë¤ò¥µ¥Ý¡¼¥È¤·¤Æ¤¤¤Þ¤¹¡£</p>
-<h3 id="item4.21">4.21</a>)¥Æ¡¼¥Ö¥ë¤È¥«¥é¥à¤Î̾Á°¤¬¥¯¥¨¥ê¡¼¤ÎÃæ¤Çǧ¼±¤µ¤ì¤Ê¤¤¤Î¤Ï¤Ê¤¼¤Ç¤¹¤«¡©¤Ê¤¼Âçʸ»ú²½(¥¥ã¥Ô¥¿¥é¥¤¥º)¤Ï²¹Â¸¤µ¤ì¤Ê¤¤¤Î¤Ç¤¹¤«?</h3>
+<h3 id="item4.20">4.20</a>)¥Æ¡¼¥Ö¥ë¤È¥«¥é¥à¤Î̾Á°¤¬¥¯¥¨¥ê¡¼¤ÎÃæ¤Çǧ¼±¤µ¤ì¤Ê¤¤¤Î¤Ï¤Ê¤¼¤Ç¤¹¤«¡©¤Ê¤¼Âçʸ»ú²½(¥¥ã¥Ô¥¿¥é¥¤¥º)¤Ï²¹Â¸¤µ¤ì¤Ê¤¤¤Î¤Ç¤¹¤«?</h3>
- <p>ǧ¼±¤µ¤ì¤¿Ì¾Á°¤Î¤â¤Ã¤È¤â°ìÈÌŪ¤Ê¸¶°ø¤Ï¡¢¥Æ¡¼¥Ö¥ë¤òºîÀ®¤¹¤ëºÝ¤Ë¡¢
+ <p>̾Á°¤¬Ç§¼±¤µ¤ì¤Ê¤¤¡¢ºÇ¤â°ìÈÌŪ¤Ê¸¶°ø¤Ï¡¢¥Æ¡¼¥Ö¥ë¤òºîÀ®¤¹¤ëºÝ¤Ë¡¢
¥Æ¡¼¥Ö¥ë¤ä¥«¥é¥à¤ò°Ï¤¦Æó½Å°úÍÑÉä¤Î»ÈÍѤǤ¹¡£
Æó½Å°úÍÑÉä¤ò»È¤¦¤È¡¢¥Æ¡¼¥Ö¥ë¤È¥«¥é¥à¤Î̾Á°¡Ê¼±Ê̻ҤȤ¤¤¤¤Þ¤¹¡Ë¤Ï<a
href="http://www.postgresql.org/docs/8.0/static/sql-syntax.html#SQL-SYNTAX-IDENTIFIERS">Âçʸ»ú¤È¾®Ê¸»ú¤Î¶èÊÌ</a>
[ÌõÃí¡§
ÆüËܸìÈǤÎÀ½ºî¤Ë¤Ä¤¤¤Æ¤Ï°Ê²¼¤ÎÄ̤ê¤Ç¤¹¡£
- ºÇ½ª¹¹¿·Æü: 2007ǯ09·î15Æü
- ËÝÌõ¼Ô: ·¬Â¼ ½á (<a href="mailto:juk at PostgreSQL.jp">Jun Kuwamura <juk at PostgreSQL.jp></a>)
+ ºÇ½ª¹¹¿·Æü: 2007ǯ10·î10Æü
+ ËÝÌõ¼Ô: ·¬Â¼ ½á (<a href="mailto:juk at postgresql.jp">Jun KUWAMURA <juk at postgresql.jp></a>)
¤³¤ÎFAQ¤ÎÏÂÌõ¤ÎºîÀ®¤Ë¤¢¤¿¤ê¶¨ÎϤò¤·¤Æ¤¯¤À¤µ¤Ã¤¿Êý¡¹(·É¾Î¤Ïά¤µ¤»¤Æ¤¤¤¿¤À¤¤Þ¤¹):
¤»¤» ¤¸¤å¤ó(<a href="mailto:sesejun at linet.gr.jp">Jun SESE <sesejun at linet.gr.jp></a>)
¿Àë ±Ñ¹§(<a href="mailto:hkamiya at catvmics.ne.jp">Hidetaka KAMIYA <hkamiya at catvmics.ne.jp></a>)
¿û¸¶ ÆØ(<a href="mailto:asugawar at f3.dion.ne.jp">Atsushi SUGAWARA <asugawar at f3.dion.ne.jp></a>)
- °ðÍÕ ¹áÍý(<a href="mailto:i-kaori at sra.co.jp">Kaori Inaba <i-kaori at sra.co.jp></a>)
+ °ðÍÕ ¹áÍý(<a href="mailto:i-kaori at sraoss.co.jp">Kaori Inaba <i-kaori at sraoss.co.jp></a>)
¤ò¤Ï¤¸¤á¡¢¥Ý¥¹¥È¥°¥ì¥¹¤Ë´Ø¤¹¤ëÏÃÂêËÉÙ¤ÊÆüËܸìPostgreSQL¥á¡¼¥ê¥ó¥°¥ê¥¹¥È¡¢
ÏÂÌõ¤Î¤¤Ã¤«¤±¤òºî¤Ã¤Æ¤¯¤ì¤¿¤ê¡¢¤¤¤Ä¤â¥Á¥§¥Ã¥¯¤ò¤·¤Æ¤¯¤ì¤ë
¤Þ¤¿¡¢ºÇ¿·ÈǤϰʲ¼¤Î¥µ¥¤¥È¤Ë¤¢¤ê¤Þ¤¹¡£
<a
- href="http://www.PostgreSQL.jp/wg/jpugdoc/">http://www.PostgreSQL.jp/wg/jpugdoc/</a> ¡ÖJPUGʸ½ñ¡¦½ñÀÒ´ØϢʬ²Ê²ñ¡×
+ href="http://www.postgresql.jp/wg/jpugdoc/">http://www.postgresql.jp/wg/jpugdoc/</a> ¡ÖJPUGʸ½ñ¡¦½ñÀÒ´ØϢʬ²Ê²ñ¡×
<a href="http://www.linux.or.jp/JF/JFdocs/INDEX-database.html">http://www.linux.or.jp/JF/JFdocs/INDEX-database.html</a> ¡ÖLinux JF¥×¥í¥¸¥§¥¯¥È¡× <a href="http://www.linet.gr.jp/~juk/pgsql/">http://www.linet.gr.jp/~juk/pgsql/</a> ¡ÖPostgreSQL Notes for Japanese¡×¡ÊËÝÌõ¼Ô¥Ú¡¼¥¸¡Ë
¤Ê¤ª¡¢¤³¤ÎÏÂÌõ¤Ë´Ø¤¹¤ë¤´°Õ¸«¡¦¤´¼ÁÌä¤Ï(<a href="mailto:juk at
- PostgreSQL.jp">juk at PostgreSQL.jp</a>)¤Þ¤Ç¤ª´ó¤»¤¯¤À¤µ¤¤¡£
+ postgresql.jp">juk at postgresql.jp</a>)¤Þ¤Ç¤ª´ó¤»¤¯¤À¤µ¤¤¡£
¡Ê¢¨ ¥á¡¼¥ë¥¢¥É¥ì¥¹¤Î " at " ¤ÏŬÀڤ˾¤·¤Æ¤¯¤À¤µ¤¤¡£È¾³Ñ¤Î "@" ¤Ç¤¹¡£¡Ë
]
</pre></small></p>
-<!-- $PostgreSQL: pgsql/doc/src/sgml/release.sgml,v 1.515 2007/10/05 04:03:41 tgl Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/release.sgml,v 1.516 2007/10/10 13:43:42 momjian Exp $ -->
<!--
Typical markup:
<title>Overview</title>
<para>
- This release adds many improvements that were requested by users,
+ This release adds major new capabilities to the
+ <productname>PostgreSQL</> database system, including:
including:
<itemizedlist>
<listitem>
<para>
- Full text search is now a built-in feature
+ Full text search now fully integrated into the core database
+ system
</para>
</listitem>
<listitem>
<para>
- enum data types
+ Enumerated (enum) data types
</para>
</listitem>
<listitem>
<para>
- UUID data type, similar to that defined by RFC 4122
+ Universally Unique Identifier (UUID) data type, similar to that
+ defined by RFC 4122
</para>
</listitem>
<listitem>
<para>
+ Control of whether <literal>NULL</>s sort first or last, using
<literal>ORDER BY ... NULLS FIRST/LAST</>
</para>
</listitem>
<listitem>
<para>
- Updatable cursors
- (<literal>UPDATE/DELETE WHERE CURRENT OF</>
- <replaceable>cursor_name</>)
+ Updatable cursors using <literal>UPDATE/DELETE WHERE CURRENT OF</>
+ <replaceable>cursor_name</>
</para>
</listitem>
<listitem>
<para>
- Per-function parameter settings
+ Per-function server configuration parameter settings
</para>
</listitem>
<listitem>
<para>
- User-defined types can now have type modifiers (parameters)
+ User-defined types can now have type modifiers
</para>
<para>
- Declarations such as <type>varchar(42)</type> are no longer
- restricted to use by built-in data types.
+ This allows a user type to take an optional modifier when
+ being created, e.g. <type>SSNUM(7)</>. Previously only
+ predefined system data types would allow this, e.g.
+ <type>CHAR(4)</>.
</para>
</listitem>
<listitem>
<para>
- Numerous improvements in logging and statistics collection
- capabilities, including the ability to emit postmaster log messages
- in CSV format that can be directly loaded into a database table
- for analysis
+ Numerous improvements in logging and statistics collection,
+ including the ability to emit postmaster log messages in
+ <acronym>CSV</> format, which can be loaded into a database
+ table for analysis
</para>
</listitem>
</para>
<para>
- Autovacuum is now considered mature enough to be enabled by default.
+ This allows multiple vacuums to run concurrently, meaning
+ vacuuming of a large table will not prevent smaller tables from
+ being vacuumed at the same time. Autovacuum is now considered
+ mature and therefore is enabled by default.
</para>
</listitem>
<listitem>
<para>
- The entire <productname>PostgreSQL</productname> system can
- now be compiled with Microsoft Visual C++
+ The backend database server can now be compiled with
+ <productname>Microsoft Visual C++</>
</para>
<para>
- This will improve the ability of Windows-based developers to
- contribute to the project. Windows executables made with Visual C++
- may also have better stability and performance than those made with
- other tool sets.
+ Windows executables made with Visual C++ might have better
+ stability and performance than those made with other tool sets.
+ Development and debugging tools familiar to Windows developers
+ will also work.
</para>
</listitem>
<listitem>
<para>
- Asynchronous commit option to allow transactions to be reported
- committed before they have actually been flushed to disk
+ Asynchronous commit option allows transactions to be committed
+ but on-disk change to be delayed
</para>
<para>
- This would not, of course, be acceptable if the client takes some
- critical external action on the assumption that the transaction
- will be remembered; but for certain applications, it is an acceptable
- risk for some or all transactions to use this mode. Unlike existing
- options such as <varname>fsync</varname>, asynchronous commit does
- not risk database corruption; the worst case is that after a crash,
- the last few reportedly-committed transactions will not have
- taken effect.
+ This feature dramatically increases performance for data
+ modification queries. The disadvantage is that because on-disk
+ changes are delayed, if the operating system crashes before data
+ is written to the disk, committed data will be lost. This is
+ only useful for applications that can accept some data loss.
+ Unlike <varname>fsync</varname>, asynchronous commit does not
+ risk database corruption; the worst case is that after an
+ operating system crash, the last few reportedly-committed
+ transactions will be missing.
</para>
</listitem>
<listitem>
<para>
- <quote>Distributed</> checkpoints to spread out the I/O load of a
- checkpoint
+ <quote>Distributed</> checkpoints prevent I/O spikes during
+ checkpoints
</para>
</listitem>
<listitem>
<para>
- Heap-Only Tuples (HOT) to reduce overhead of updates
+ Heap-Only Tuples (<acronym>HOT</>) reduce overhead of updates
+ </para>
+
+ <para>
+ To allow high concurrency <productname>PostgreSQL</> retains old
+ versions of updated rows. Previously only <command>VACUUM</>
+ could reuse space taken by dead rows. With <acronym>HOT</> dead
+ row space can be reused at the time of <command>UPDATE</> or
+ <command>INSERT</>. This allows for more consistent performance.
</para>
</listitem>
Just-in-time background writer strategy to improve disk write
efficiency
</para>
+
+ <para>
+ This basically makes the background writer self-tuning.
+ </para>
+
</listitem>
<listitem>
<para>
- Reduction of on-disk data size through reducing both per-tuple
- and per-field overheads
+ Reduction of both per-field and per-row storage requirements
+ </para>
+
+ <para>
+ For example, two <type>CHAR(1)</type> fields now take 4 bytes
+ instead of 16.
</para>
</listitem>
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