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+¡¢ http://www.postgresql.org/files/documentation/faqs/FAQ_DEV.html ¤Ë¤¢¤ë³«È¯¼Ô
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+
+
+PostgreSQL Data Base Management System
+
+Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group Portions
+Copyright (c) 1994-1996 Regents of the University of California
+
+Permission to use, copy, modify, and distribute this software and its
+documentation for any purpose, without fee, and without a written agreement is
+hereby granted, provided that the above copyright notice and this paragraph and
+the following two paragraphs appear in all copies.
+
+IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
+DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST
+PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
+THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
+DAMAGE.
+
+THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
+BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND
+THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATIONS TO PROVIDE MAINTENANCE,
+SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
- PostgreSQL Data Base Management System
-
- Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
- Portions Copyright (c) 1994-6 Regents of the University of California
-
- Permission to use, copy, modify, and distribute this software and its
- documentation for any purpose, without fee, and without a written
- agreement is hereby granted, provided that the above copyright notice
- and this paragraph and the following two paragraphs appear in all
- copies.
-
- IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY
- FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES,
- INCLUDING LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND
- ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF CALIFORNIA HAS BEEN
- ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
- THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
- INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
- MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE
- PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND THE UNIVERSITY OF
- CALIFORNIA HAS NO OBLIGATIONS TO PROVIDE MAINTENANCE, SUPPORT,
- UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
POSTGRESQL ¥Ç¡¼¥¿¥Ù¡¼¥¹´ÉÍý¥·¥¹¥Æ¥à
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+ ÉôʬŪÃøºî¸¢ (c) 1994-1996 ¥«¥ê¥Õ¥©¥ë¥Ë¥¢Âç³ØËܹ»
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+PostgreSQL ¤òÁö¤é¤»¤ë¤³¤È¤¬¤Ç¤¤Þ¤¹¡£
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+ ¾Ü¤·¤¯¤Ï¡¢¼¡¤Î WindwosÈǤ˴ؤ¹¤ëFAQ¤ÎÏÂÌõ¤ò¤´¤é¤ó¤¯¤À¤µ¤¤¡£
+ http://www.postgresql.jp/wg/jpugdoc/FAQ_windows.ja.html
+ ]
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- Japan: ftp://ring.ip-kyoto.ad.jp/pub/misc/db/PostgreSQL/
- Japan: ftp://ring.crl.go.jp/pub/misc/db/PostgreSQL/
- Japan: ftp://ring.saitama-u.ac.jp/pub/misc/db/PostgreSQL/
- Japan: ftp://ring.astem.or.jp/pub/misc/db/PostgreSQL/
- Japan: ftp://ring.exp.fujixerox.co.jp/pub/misc/db/PostgreSQL/
- Japan: ftp://ring.jah.ne.jp/pub/misc/db/PostgreSQL/
- Japan: ftp://ring.etl.go.jp.jp/pub/misc/db/PostgreSQL/
- Japan: ftp://ring.asahi-net.or.jp/pub/misc/db/PostgreSQL/
- Japan: ftp://ring.so-net.ne.jp/pub/misc/db/PostgreSQL/
- Japan: ftp://ring.aist.go.jp/pub/misc/db/PostgreSQL/
- ]
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SELECT *
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WHERE lower(col) = 'abc';
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-Type Internal Name Notes
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+
+ SELECT *
+ FROM tab
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+ ·¿ ÆâÉô̾ È÷¹Í
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+ CREATE TABLE person (
+ id SERIAL,
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+ );
+
+¤Ï¼«Æ°Åª¤Ë¼¡¤Î¤è¤¦¤ËËÝÌõ¤µ¤ì¤Þ¤¹:
+
+ CREATE SEQUENCE person_id_seq;
+ CREATE TABLE person (
+ id INT4 NOT NULL DEFAULT nextval('person_id_seq'),
+ name TEXT
+ );
[ÌõÃí¡§
CREATE UNIQUE INDEX person_id_key ON person ( id );
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+
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PostgreSQL Data Base Management System
+ Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
+ Portions Copyright (c) 1994-1996 Regents of the University of California
+ Permission to use, copy, modify, and distribute this software and its
+ documentation for any purpose, without fee, and without a written
+ agreement is hereby granted, provided that the above copyright notice
+ and this paragraph and the following two paragraphs appear in all
+ copies.
+ IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY
+ FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES,
+ INCLUDING LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS
+ DOCUMENTATION, EVEN IF THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF
+ THE POSSIBILITY OF SUCH DAMAGE.
+ THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
+ INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
+ AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER
+ IS ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO
+ OBLIGATIONS TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR
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+
+
| ·¿ | ÆâÉô̾ | È÷¹Í |
|---|
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| VARCHAR(n) | varchar | ºÇÂçĹ¤Î¥µ¥¤¥º¤ò»ØÄꤹ¤ë¡¢µÍ¤áʪ̵¤· |
+
| CHAR(n) | bpchar | »ØÄꤵ¤ì¤¿¸ÇÄêĹ¤È¤Ê¤ë¤è¤¦¤Ë¶õÇò¤¬µÍ¤á¤é¤ì¤ë |
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| TEXT | text | Ťµ¤ËÆÃÊ̤ʾå¸Â¤Ï̵¤· |
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| BYTEA | bytea | ²ÄÊÑĹ¤Î¥Ð¥¤¥ÈÇÛÎó(null-byte safe) |
+
| "char" | char | 1ʸ»ú |
+
+
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¥é¥ó¥À¥à¤Ê¥í¥¦¤òSELECT¤¹¤ë¤Ë¤Ï¡¢¼¡¤Îʸ¤ò»È¤¤¤Þ¤¹¡§
-
- SELECT col
- FROM tab
- ORDER BY random()
- LIMIT 1;
-
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+ ¥á¥Ã¥»¡¼¥¸¤ò¼õ¤±¼è¤ë¤È¤¤Ç¤¹¡£
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4.3) ¥Æ¡¼¥Ö¥ë¤ä¤½¤Î¾¤Î¾ðÊó¤Î¥ê¥¹¥È¤ò psql ¤Ç¸«¤ë¤Ë¤Ï¤É¤¦¤·¤Þ¤¹¤«¡©
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- psql¤ÎÃæ¤Ç¡¢ \dt ¥³¥Þ¥ó¥É¤ò»È¤Ã¤Æ¥Æ¡¼¥Ö¥ë¤ò¸«¤Þ¤¹¡£psql ¤ÎÃæ¤Î¥³¥Þ¥ó¥É¤Î´°Á´¤Ê¥ê¥¹¥È¤Ë¤Ï \? ¤ò»È¤¨¤Þ¤¹¡£¤¢¤ë¤¤¤Ï¡¢psql¤Î¥½¡¼¥¹¥³¡¼¥É¤Îpgsql/src/bin/psql/describe.c¥Õ¥¡¥¤¥ë¤ò¸«¤ë¤³¤È¤â¤Ç¤¤Æ¡¢¤½¤ÎÃæ¤Ë¤Ïpsql¤Î¥Ð¥Ã¥¯¥¹¥é¥Ã¥·¥å¥³¥Þ¥ó¥É¤Î½ÐÎϤòÀ¸À®¤¹¤ëSQL¥³¥Þ¥ó¥É¤¬´Þ¤Þ¤ì¤Æ¤¤¤Þ¤¹¡£¤Þ¤¿¡¢psql¤ò -E ¥ª¥×¥·¥ç¥ó¤È°ì½ï¤Ë³«»Ï¤¹¤ë¤È¡¢¼Â¹Ô¤µ¤»¤¿¥³¥Þ¥ó¥É¤ò¼Â¹Ô¤¹¤ë¤¿¤á¤Ë»È¤¦Ì䤤¹ç¤ï¤»¤ò½ÐÎϤ¹¤ë¤è¤¦¤Ë¤Ê¤ê¤Þ¤¹¡£PostgreSQL¤Ï¤Þ¤¿¡¢SQLiÂбþ¤Î INFORMATION SCHEMA ¥¤¥ó¥¿¡¼¥Õ¥§¡¼¥¹¤òÍÑ°Õ¤·¤Æ¤¤¤Æ¡¢¥Ç¡¼¥¿¥Ù¡¼¥¹¤Ë¤Ä¤¤¤Æ¤Î¾ðÊó¤òÆÀ¤ë¤¿¤á¤ËÌ䤤¹ç¤ï¤»¤ò»È¤¦¤³¤È¤¬¤Ç¤¤Þ¤¹¡£
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+ ¥¯¤ÎºÇ½é¤Î£´¥Ð¥¤¥È¤¬¥Ç¡¼¥¿Ä¹¤Ç¡¢¤½¤ì¤Î¸å¤Ë¼ÂºÝ¤Î¥Ç¡¼¥¿¤¬Â³¤¤Þ¤¹)¡£
+ ¤³¤Î¤è¤¦¤Ë¼ÂºÝ¤Î¶õ´Ö¤ÏÀë¸À¤µ¤ì¤¿Â礤µ¤è¤ê¤â¾¯¤·Â礤¯¤Ê¤ê¤Þ¤¹¡£¤·¤«
+ ¤·¡¢Ä¹¤¤Ãͤϰµ½Ì¤µ¤ì¤ë¤Î¤Ç¡¢¥Ç¥£¥¹¥¯¾å¤Î¶õ´Ö¤Ï»×¤Ã¤¿¤è¤ê¤â¾®¤µ¤¯¤Ê¤ê¤Þ¤¹¡£
+
VARCHAR(n) ¤Ï²ÄÊÑŤÎʸ»úÎó¤òÊݸ¤¹¤ë¤Î¤ËºÇŬ¤Ç¤¹
+ ¤¬¡¢Êݸ¤Ç¤¤ëʸ»úÎó¤ÎŤµ¤ËÀ©¸Â¤¬¤¢¤ê¤Þ¤¹¡£TEXT ¤ÏĹ
+ ¤µ¤ËÀ©¸Â¤Î̵¤¤Ê¸»úÎó¤ÎÊݸ¤Î¤¿¤á¤Î¤â¤Î¤Ç¡¢ºÇÂç¤Ç 1¥®¥¬¥Ð¥¤¥È¤Ç¤¹¡£
+ CHAR(n)¤Ï¡¢VARCHAR(n)¤¬Í¿¤¨¤é¤ì¤¿Ê¸»ú
+ ¤À¤±¤òÊݸ¤¹¤ë¤Î¤ËÂФ·¡¢¥Ö¥é¥ó¥¯¤òµÍ¤á¹þ¤ó¤Ç¤¤¤Ä¤âƱ¤¸Ä¹¤µ¤Çʸ»úÎó¤ò
+ Êݸ¤¹¤ë¤Î¤ËºÇŬ¤Ç¤¹¡£BYTEA¤Ï¡¢ÉôʬŪ¤Ë
+ NULL ¤Î¥Ð¥¤¥È¤ò´Þ¤à¥Ð¥¤¥Ê¥ê¥Ç¡¼¥¿¤òÊݸ¤¹¤ë¤¿¤á¤Î¤â¤Î
+ ¤Ç¤¹¡£¤³¤ì¤é¤Î¥¿¥¤¥×¤ÏƱ¤¸¤¯¤é¤¤¤ÎÀǽÆÃÀ¤ò¤â¤Á¤Þ¤¹¡£
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4.4) ¥Æ¡¼¥Ö¥ë¤«¤é¥«¥é¥à¤Îºï½ü¡¢¤¢¤ë¤¤¤Ï¡¢¥Ç¡¼¥¿·¿¤òÊѹ¹¤¹¤ë¤Ë¤Ï¤É¤¦¤·¤Þ¤¹¤«¡©
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DROP COLUMNµ¡Ç½¤¬¡¢ALTER TABLE DROP COLUMN ¤È¤·¤Æ¥ê¥ê¡¼¥¹7.3
-¤Ë²Ã¤¨¤é¤ì¤Þ¤·¤¿¡£¤½¤ì¤Þ¤Ç¤Î¥Ð¡¼¥¸¥ç¥ó¤Ç¤Ï¡¢¤½¤ÎÂå¤ï¤ê¤Ë¤³¤¦¤·¤Þ¤¹:
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4.11.1) ÄÌÈÖ(serial)¡¿¼«Æ°Áýʬ¥Õ¥£¡¼¥ë¥É¤Ï¤É¤Î¤è¤¦¤Ë¤Ä¤¯¤ê¤Þ¤¹¤«¡©
- BEGIN;
- LOCK TABLE old_table;
- SELECT ... -- ºï½ü¤·¤¿¤¤¥«¥é¥à°Ê³°¤Î¥«¥é¥à¤ò¤¹¤Ù¤ÆÁªÂò¤·¤Þ¤¹¡£
- INTO TABLE new_table
- FROM old_table;
- DROP TABLE old_table;
- ALTER TABLE new_table RENAME TO old_table;
- COMMIT;
-
+
PostgreSQL ¤Ï SERIAL ¥Ç¡¼¥¿·¿¤ò¥µ¥Ý¡¼¥È¤·¤Þ¤¹¡£¥«
+ ¥é¥à¾å¤Ë¥·¡¼¥±¥ó¥¹¤ò¼«Æ°ºîÀ®¤·¤Þ¤¹¡£¤¿¤È¤¨¤Ð¡¢
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¥«¥é¥à¤Î¥Ç¡¼¥¿¥¿¥¤¥×¤Ï¼¡¤Îʸ¤ÇÊѤ¨¤é¤ì¤Þ¤¹¡§
-
+ CREATE TABLE person (
+ id SERIAL,
+ name TEXT
+ );
+
+ ¤Ï¼«Æ°Åª¤Ë¼¡¤Î¤è¤¦¤ËËÝÌõ¤µ¤ì¤Þ¤¹:
+ CREATE SEQUENCE person_id_seq;
+ CREATE TABLE person (
+ id INT4 NOT NULL DEFAULT nextval('person_id_seq'),
+ name TEXT
+ );
+ [ÌõÃí¡§
+ CREATE UNIQUE INDEX person_id_key ON person ( id );
+ ¤Ï¡¢ 7.3 °Ê¹ß¤Ï¼«Æ°Åª¤Ë¤Ï¹Ô¤Ê¤ï¤ì¤Ê¤¯¤Ê¤ê¤Þ¤·¤¿¡£
+ ]
+
+ ÄÌÈ֤ˤĤ¤¤Æ¤Î¤â¤Ã¤È¾Ü¤·¤¤¾ðÊó¤Ï¡¢¥ª¥ó¥é¥¤¥ó¥Þ¥Ë¥å¥¢¥ë¤Ç
+ create_sequence ¤ò¤´¤é¤ó¤¯¤À¤µ¤¤¡£
- BEGIN;
- ALTER TABLE tab ADD COLUMN new_col new_data_type;
- UPDATE tab SET new_col = CAST(old_col AS new_data_type);
- ALTER TABLE tab DROP COLUMN old_col;
- COMMIT;
-
-
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+
4.11.2) SERIAL¥Ç¡¼¥¿·¿¤ËÁÞÆþ¤µ¤ì¤ëÃͤϡ¢¤É¤¦¤¹¤ì¤ÐÆÀ¤é¤ì¤Þ¤¹¤«¡©
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4.5) ¥í¥¦¡¢¥Æ¡¼¥Ö¥ë¡¢¥Ç¡¼¥¿¥Ù¡¼¥¹¤ÎºÇÂ祵¥¤¥º¤Ï¡©
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+
¤Ò¤È¤Ä¤ÎÊýË¡¤Ï¡¢nextval() ´Ø¿ô¤ò»È¤Ã¤Æ¤½¤ÎÃͤòÁÞÆþ¤¹¤ë
+ Á°(before)¤Ë SEQUENCE ¥ª¥Ö¥¸¥§¥¯¥È¤«¤é¼¡¤Î SERIAL
+ Ãͤò¼è¤ê½Ð¤·¡¢¤½¤ì¤«¤é¼ÂºÝ¤ËÁÞÆþ¤ò¤¹¤ë¤³¤È¤Ç¤¹¡£
+ href="#4.11.1">4.11.1 ¤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¡£
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-¥Æ¡¼¥Ö¥ë¤ÎºÇÂ祵¥¤¥º? 32TB
-¥í¥¦¤ÎºÇÂ祵¥¤¥º? 1.6TB
-¥Õ¥£¡¼¥ë¥É¤ÎºÇÂ祵¥¤¥º? 1GB
-¥Æ¡¼¥Ö¥ëÆâ¤Ç¤ÎºÇÂç¥í¥¦¿ô? À©¸Â̵¤·
-¥Æ¡¼¥Ö¥ëÆâ¤Ç¤ÎºÇÂ祫¥é¥à¿ô? ¥«¥é¥à¤Î·¿¤Ë¤è¤ê250-1600
-¥Æ¡¼¥Ö¥ëÆâ¤Ç¤ÎºÇÂ祤¥ó¥Ç¥Ã¥¯¥¹¿ô? À©¸Â̵¤·
-
+ new_id = execute("SELECT nextval('person_id_seq')");
+ execute("INSERT INTO person (id, name) VALUES (new_id, 'Blaise Pascal')");
+
-
¤â¤Á¤í¤ó¡¢¤³¤ì¤é¤Ï¼ÂºÝ¤Ï̵À©¸Â¤Ç¤Ï¤Ê¤¯¡¢¥Ç¥£¥¹¥¯ÍÆÎ̤ȥá¥â¥ê¡¼¤ä¥¹¥ï¥Ã¥×¥¹¥Ú¡¼¥¹¤ÎÂ礤µ¤Ë¤è¤êÀ©¸Â¤µ¤ì¤Þ¤¹¡£Àǽ¤Ï¤³¤ì¤é¤ÎÃͤ¬¤³¤È¤Î¤Û¤«Â礤ʻþ¤ËÀú¤ê¤ò¼õ¤±¤Þ¤¹¡£
-
+ ¤½¤¦¤·¤Æ¡¢new_id ¤ËÊݸ¤·¤¿¿·¤·¤¤Ãͤò¾¤Î¥¯¥¨¥ê(¤¿¤È¤¨¤Ð¡¢
+ person ¥Æ¡¼¥Ö¥ë¤ËÂФ¹¤ë³°Éô¥¡¼(foreign key)¤Î¤è¤¦¤Ë)»È¤¦¤È
+ ¤è¤¤¤Ç¤·¤ç¤¦¡£¼«Æ°Åª¤Ëºî¤é¤ì¤¿SEQUENCE¥ª¥Ö¥¸¥§¥¯¥È¤Î
+ ̾Á°¤Ï¡¢<table>_<serialcolumn>_seq
+ ¤Î¤è¤¦¤Ë¤Ê¤ê¡¢¤³¤Î¤¦¤Á¡¢table ¤È serialcolumn ¤Ï¤½¤ì¤¾
+ ¤ì¥Æ¡¼¥Ö¥ë¤Î̾Á°¤ÈSERIAL¥«¥é¥à¤Î̾Á°¤Ç¤¹¡£
-
ºÇÂç¥Æ¡¼¥Ö¥ë¥µ¥¤¥º¤Î32TB¤Ï¥ª¥Ú¥ì¡¼¥Æ¥£¥ó¥°¥·¥¹¥Æ¥à¤Ë¤è¤ëµðÂç¥Õ¥¡¥¤¥ë¤Î¥µ¥Ý¡¼¥È¤ÏɬÍפȤ·¤Þ¤»¤ó¡£µðÂç¤Ê¥Æ¡¼¥Ö¥ë¤ÏÊ£¿ô¤Î1GB¤Î¥Õ¥¡¥¤¥ë¤Ëʬ¤±¤ÆÊݸ¤µ¤ì¤Þ¤¹¤Î¤Ç¡¢¥Õ¥¡¥¤¥ë¥·¥¹¥Æ¥à¤ÎÀ©¸Â¤Ï½ÅÍפǤϤ¢¤ê¤Þ¤»¤ó¡£
-
+
¤¢¤ë¤¤¤Ï¡¢Í¿¤¨¤é¤ì¤¿SERIALÃͤò¡¢¤½¤ì¤¬´ûÄêÃͤȤ·¤Æ
+ ÁÞÆþ¤µ¤ì¤¿¸å¤Ç(after)¡¢ currval() ´Ø¿ô¤ò»È¤Ã¤Æ¼è¤ê½Ð¤¹
+ ¤³¤È¤â¤Ç¤¤Þ¤¹¡£¤¿¤È¤¨¤Ð¡¢
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¥Ç¥Õ¥©¥ë¥È¤Î¥Ö¥í¥Ã¥¯¥µ¥¤¥º¤ò32k¤Ë¤¹¤ë¤³¤È¤Ç¡¢ºÇÂç¥Æ¡¼¥Ö¥ë¥µ¥¤¥º¤ÈºÇÂ祫¥é¥à¿ô¤È¤ò£´Çܤˤ¹¤ë¤³¤È¤¬¤Ç¤¤Þ¤¹¡£
-
+ execute("INSERT INTO person (name) VALUES ('Blaise Pascal')");
+ new_id = execute("SELECT currval('person_id_seq')");
+
-
4.6) °ìÈÌŪ¤Ê¥Æ¥¥¹¥È¥Õ¥¡¥¤¥ë¤«¤é¥Ç¡¼¥¿¤òÊݸ¤¹¤ë¤Ë¤Ï¡¢¥Ç¡¼¥¿¥Ù¡¼¥¹¤Î¥Ç¥£¥¹¥¯ÍÆÎ̤ϤɤΤ¯¤é¤¤É¬ÍפǤ¹¡©
-
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+
4.11.3) currval() ¤Ï¾¤Î¥æ¡¼¥¶¤È¤Î¶¥¹ç¾õÂ֤˴٤뤳¤È¤Ï¤Ê¤¤¤Ç¤¹¤«¡©
-
ÎãÂê¤È¤·¤Æ¡¢³Æ¹Ô¤ËÀ°¿ô¤È¥Æ¥¥¹¥Èµ½Ò¤ò»ý¤Ä 100,000¹Ô¤Î¥Õ¥¡¥¤¥ë¤ò¹Í¤¨
-¤Æ¤ß¤Þ¤·¤ç¤¦¡£¥Æ¥¥¹¥È¤Îʸ»úÎó¤ÎÊ¿¶ÑŤµ¤ò20¥Ð¥¤¥È¤È²¾Äꤹ¤ë¤È¡¢¥Õ¥é¥Ã¥È
-¥Õ¥¡¥¤¥ë¤ÎÂ礤µ¤ÏÌó2.8MB ¤Ç¤¹¡£¤³¤Î¥Ç¡¼¥¿¤ò´Þ¤à PostgreSQL ¥Ç¡¼¥¿¥Ù¡¼¥¹
-¥Õ¥¡¥¤¥ë¤ÎÂ礤µ¤Ï¼¡¤Î¤è¤¦¤ËÌó6.4MB¤È¸«ÀѤâ¤ë¤³¤È¤¬¤Ç¤¤Þ¤¹¡§
-
+
¤½¤ì¤Ï¤¢¤ê¤Þ¤»¤ó¡£currval() ¤Ï¡¢¤¹¤Ù¤Æ¤Î¥æ¡¼¥¶¤Ç¤Ï¤¢¤ê¤Þ¤»
+ ¤ó¤¬¡¢ÆɼԤΥ»¥Ã¥·¥ç¥ó¤ËÍ¿¤¨¤é¤ì¤¿¸½ºß¤ÎÃͤòÊÖ¤·¤Þ¤¹¡£
- 32 bytes: ³Æ¥í¥¦¤Î¥Ø¥Ã¥À(³µ»»)
- 24 bytes: À°¿ô(int)¥Õ¥£¡¼¥ë¥É¤È¥Æ¥¥¹¥È(text)¥Õ¥£¡¼¥ë¥É
- + 4 bytes: ¥Ú¡¼¥¸¾å¤Î¥¿¥Ã¥×¥ë¤Ø¤Î¥Ý¥¤¥ó¥¿
- ----------------------------------------
- 60 bytes per row
- PostgreSQL ¤Î¥Ç¡¼¥¿¥Ú¡¼¥¸¥µ¥¤¥º¤Ï 8192¥Ð¥¤¥È(8KB)¤Ê¤Î¤Ç:
+
4.11.4) ¥È¥é¥ó¥¶¥¯¥·¥ç¥ó¤¬ÃæÃǤ·¤¿¤È¤¤Ë¤â¤¦¤¤¤Á¤É¥·¡¼¥±¥ó¥¹Èֹ椬»È¤ï¤ì¤Ê¤¤¤Î¤Ï¤Ê¤¼¤Ç¤¹¤«¡©¥·¡¼¥±¥ó¥¹¡¿SERIAL¥«¥é¥à¤Ë¶õ¤¤¬¤¢¤ë¤Î¤Ï¤Ê¤¼¤Ç¤¹¤«¡©
- 8192 bytes per page
- ------------------- = 136 rows per database page (ÀÚ¤ê¼Î¤Æ)
- 60 bytes per row
+
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+ ¥é¥ó¥¶¥¯¥·¥ç¥ó¤¬½ªÎ»¤¹¤ë¤Þ¤Ç¥í¥Ã¥¯¤µ¤ì¤Ê¤¤¤è¤¦¥·¡¼¥±¥ó¥¹ÃͤòÍ¿¤¨¤Æ¤¤
+ ¤Þ¤¹¡£¤³¤Î¤¿¤á¥È¥é¥ó¥¶¥¯¥·¥ç¥ó¤¬ÃæÃǤµ¤ì¤ë¤ÈÈÖ¹æ³ä¤êÅö¤Æ¤Ë¥®¥ã¥Ã¥×¤ò
+ À¸¤¸¤Þ¤¹¡£
- 100000 data rows
- -------------------- = 782 database pages (ÀÚ¤ê¾å¤²)
- 128 rows per page
-
- 735 database pages * 8192 bytes per page = 6,021,120 bytes (6 MB)
-
-
-¥¤¥ó¥Ç¥Ã¥¯¥¹¤Ï¡¢¤³¤ì¤Û¤É¤Î¥ª¡¼¥Ð¥Ø¥Ã¥É¤ÏÍ׵ᤷ¤Þ¤»¤ó¤¬¡¢¥¤¥ó¥Ç¥Ã¥¯¥¹ÉÕ¤±¤µ¤ì¤ë¥Ç¡¼¥¿¤ò´Þ¤à°Ê¾å¡¢¤½¤ì¤Ê¤ê¤ËÂ礤¯¤Ê¤ê¤Þ¤¹¡£
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4.7) ÄêµÁ¤µ¤ì¤¿¥Æ¡¼¥Ö¥ë¡¢¥¤¥ó¥Ç¥Ã¥¯¥¹¡¢¥Ç¡¼¥¿¥Ù¡¼¥¹¡¢¤ª¤è¤Ó¡¢¥æ¡¼¥¶¤ò¤É¤Î¤è¤¦¤Ë¤·¤Æ¸«¤Ä¤±½Ð¤·¤Þ¤¹¤«¡©
-
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psql ¤Ë¤Ï¤¤¤í¤¤¤í¤Ê¥Ð¥Ã¥¯¥¹¥é¥Ã¥·¥å¡¦¥³¥Þ¥ó¥É¤¬¤¢¤ê¡¢¤³¤¦¤·¤¿¾ðÊó¤òɽ¼¨¤·¤Þ¤¹¡£¥Ð¥Ã¥¯¥¹¥é¥Ã¥·¥å¡¦¥³¥Þ¥ó¥É¤Î¼ïÎà¤ò¸«¤ë¤Ë¤Ï \? ¤ò»È¤Ã¤Æ²¼¤µ¤¤¡£¤Þ¤¿¡¢pg_ ¤Ç»Ï¤Þ¤ë¥·¥¹¥Æ¥à¥Æ¡¼¥Ö¥ë¤Ë¤âµ½Ò¤µ¤ì¤Æ¤¤¤Þ¤¹¡£¤µ¤é¤Ë¡¢psql -l ¤Ï¤¹¤Ù¤Æ¤Î¥Ç¡¼¥¿¥Ù¡¼¥¹¤ò¥ê¥¹¥Èɽ¼¨¤·¤Þ¤¹¡£
-
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4.8) Ì䤤¹ç¤ï¤»¤¬ÃÙ¤¤¤¦¤¨¡¢¥¤¥ó¥Ç¥Ã¥¯¥¹¤ò»È¤Ã¤Æ¤¤¤ëÍͻҤ¬¤¢¤ê¤Þ¤»¤ó¡£¤Ê¤¼¤Ç¤¹¤«¡©
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¥¤¥ó¥Ç¥Ã¥¯¥¹¤ò»È¤¦¤«¤ò·èÄꤹ¤ë¤¿¤á¤Ë¡¢PostgreSQL ¤Ï¥Æ¡¼¥Ö¥ë¤Ë¤Ä¤¤
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4.16) OID ¤È¤Ï²¿¤Ç¤¹¤«¡© TID ¤È¤Ï²¿¤Ç¤¹¤«¡©
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projects / postgresql.git / commitdiff