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PostgreSQL 常è¦åé¡ï¼FAQï¼ |
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æè¿æ´æ°ï¼2007 å¹´ 2 æ 8 æ¥ ææäº 22:43:13 EST |
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ä¸æçæè¿æ´æ°ï¼2007 å¹´ 2 æ 12 æ¥ ææä¸ 12:00:04 CST |
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ç¶åç¶è·äººå¡ï¼Bruce Momjian (pgman@candle.pha.pa.us) |
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æ£é«ä¸æçç¶è·äººå¡ï¼éæç(ChaoYi, Kuo)ï¼kuo.chaoyi@gmail.comï¼ |
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èä½æ¥ç³»çµ±å¹³å°ç¸éçåé¡å¯å¨ http://www.postgresql.org/docs/faq/ |
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常è¦åé¡ |
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1.1)PostgreSQL æ¯ä»éº¼ï¼è©²æ麼ç¼é³ï¼ |
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2.1)æåå¯ä»¥ç¨ä»éº¼èªè¨å PostgreSQL é²è¡æºéï¼ |
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2.2)æä»éº¼å·¥å·å¯ä»¥æ PostgreSQL ç¨æ¼ Web é é¢ï¼ |
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4.11.4) çºä»éº¼ä¸å¨äºåç°å¸¸ä¸æ¢å¾éç¨åºåèå¢ï¼çºä»éº¼å¨åºåèæ¬ä½çåå¼ä¸ |
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4.12) ä»éº¼æ¯ OIDï¼ä»éº¼æ¯ CTID ï¼ |
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4.14) æå¦ä½æè½ç¥éæéè¡ç PostgreSQL ççæ¬ï¼ |
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常è¦åé¡ |
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1.1) PostgreSQL æ¯ä»éº¼ï¼è©²æ麼ç¼é³ï¼ |
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PostgreSQL è®ä½ Post-Gres-Q-Lï¼ææåä¹ç°¡ç¨±çºPostgres |
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1.2) 誰æ§å¶ PostgreSQL ï¼ |
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å¦æä½ å¨å°æ¾PostgreSQLçæé人ï¼ææ¯ä»éº¼ä¸ |
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1.3) PostgreSQL ççæ¬æ¯ä»éº¼? |
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PostgreSQLçç¼å¸éµå¾ç¶å¸ç BSD çæ¬ãå®å許ç¨æ¶ä¸éç®çå°ä½¿ç¨ |
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PostgreSQLï¼çè³ä½ å¯ä»¥é·å® PostgreSQL |
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ä¸é¢å°±æ¯æåæ使ç¨çBSDçæ¬è²æå§å®¹ï¼ |
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PostgreSQL è³æ庫管ç系統 |
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é¨åçæ¬ï¼cï¼1996-2005ï¼PostgreSQL å¨çéç¼å°çµï¼é¨åçæ¬ï¼cï¼1994-1996 |
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å å·å¤§å¸è£äº |
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ï¼Portions copyright (c) 1996-2005,PostgreSQL Global Development Group |
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Portions Copyright (c) 1994-6 Regents of the University of |
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Californiaï¼ |
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並ä¸ç¡é 簽署å æ¤èç¢ççèæï¼åææ¯ä¸é¢ççæ¬è²æåæ¬æ®µä»¥åä¸é¢å©æ®µæå |
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ï¼Permission to use, copy, modify, and distribute this software and |
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its documentation for any purpose, without fee, and without a written |
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agreement is hereby granted, provided that the above copyright notice |
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and this paragraph and the following two paragraphs appear in all |
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copies.ï¼ |
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ï¼IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY |
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PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL |
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DAMAGES, INCLUDING LOST PROFITS, ARISING OUT OF THE USE OF THIS |
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SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF CALIFORNIA |
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HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.ï¼ |
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ï¼THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES, |
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
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MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE |
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PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND THE UNIVERSITY OF |
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CALIFORNIA HAS NO OBLIGATIONS TO PROVIDE MAINTENANCE, SUPPORT, |
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UPDATES, ENHANCEMENTS, OR MODIFICATIONS.ï¼ |
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1.4) PostgreSQL å¯ä»¥éè¡å¨åªäºä½æ¥ç³»çµ±å¹³å°ä¸ï¼ |
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1.5) æå¾åªè£¡è½å¾å° PostgreSQLï¼ |
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1.6) ææ°çç PostgreSQL æ¯ä»éº¼ï¼ |
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PostgreSQL ææ°ççæ¬æ¯çæ¬ 8.2.3 ã |
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1.10) è½å¤ ç²åçææ°ææªæåªäºï¼ |
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çæåï¼å¶ç¶²åæ¯ï¼http://www.PostgreSQL.org/docsã |
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æå©æ¬éæ¼PostgreSQLçæ¸å¨ç·æä¾ï¼å¨ |
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http://www.postgresql.org/docs/books/awbook.html å |
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http://www.commandprompt.com/ppbook/ ã ä¹æ大éç PostgreSQL |
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æ¸ç±å¯ä¾è³¼è²·ï¼å¶ä¸æçºæµè¡çä¸æ¬æ¯ç± Korry Douglas 編寫çãå¨ |
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http://techdocs.PostgreSQL.org/techdocs/bookreviews.phpä¸ ä¸æ大éæé |
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PostgreSQL æ¸ç±çç°¡ä»ã å¨ http://techdocs.PostgreSQL.org/ ä¸æ¶éäºæé |
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PostgreSQL ç大éæè¡æç« ã |
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1.11) ææ該æ樣å¸ç¿ SQL ï¼ |
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é¦åèæ®ä¸è¿°æå°çèPostgreSQLç¸éçæ¸ç±ï¼å¦å¤ä¸æ¬æ¯ Teach Yourself SQL in |
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21 Days, Second Editionï¼å¶è©³ç´°ä»ç´¹ç網åæ¯ |
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http://members.tripod.com/er4ebus/sql/index.htmï¼ æåç許å¤ç¨æ¶åæ¡The |
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Practical SQL Handbookï¼ Bowman, Judith S. |
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Groff 編寫ï¼McGraw-Hill å¬å¸åºçã |
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å¨ä¸å網åä¸ä¹æå¾å¥½çæç¨ï¼ä»åæ¯ |
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* http://www.intermedia.net/support/sql/sqltut.shtm |
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* http://sqlcourse.com. |
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* http://www.w3schools.com/sql/default.asp |
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* http://mysite.verizon.net/Graeme_Birchall/id1.html |
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1.12)å¦ä½æ交è£ä¸ææ¯å å¥éç¼éä¼ï¼ |
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1.14) PostgreSQL å¯ä»¥èçæè¿ååå家å¤æå¶çè®åå? |
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PostgreSQL 8.0ä¹åççæ¬æ¯ä½¿ç¨ä½æ¥ç³»çµ±ä¸çæåè³æ庫ä¾èçå¤æå¶çè³è¨ï¼èª |
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8.0 çå以å¾ççæ¬ PostgreSQL æèªèº«å«æææ°çæåè³è¨ã |
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2.1) æåå¯ä»¥ç¨ä»éº¼èªè¨å PostgreSQL é²è¡æºéï¼ |
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PostgreSQL (é è¨ææ³)åªå®è£æ C åå§åµå¼ C |
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ä¸äºç·¨ç¨èªè¨å¦ PHP é½æ訪å PostgreSQL çæ¥å£ï¼PerlãTCLãPython |
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Drivers/Interfaces å°ç¯å¯æ¾å°ï¼ 並ä¸éé Internet å¾å®¹ææç´¢å°ã |
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2.2) æä»éº¼å·¥å·å¯ä»¥æ PostgreSQL ç¨æ¼ Web é é¢ï¼ |
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2.3)PostgreSQL ææåå½¢ç¨æ¶çé¢åï¼ |
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åæ¥ç¨æ¶ææ¯éæºéç¼äººå¡è½æ¾å°å¾å¤çæé PostgreSQLçGUI å形工å·è»é«ï¼å¨ |
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3.1)ææ樣è½æ PostgreSQL è£å¨ /usr/local/pgsql 以å¤çå°æ¹ï¼ |
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3.2) æå¦ä½æ§å¶ä¾èªå¶ä»é»è¦çé£æ¥ï¼ |
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æ¹å¼çé£æ¥ã ä½ åªæå¨ä¿®æ¹äºéç½®æ件 postgresql.conf ä¸ç |
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PostgreSQLï¼å¦åå¶ä»é»è¦æ¯ä¸è½èä½ ç PostgreSQL 伺æå¨é²è¡é£æ¥çã |
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3.3) ææ樣調æ´è³æ庫å¼æ以ç²å¾æ´å¥½çæ§è½ï¼ |
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æä¸å主è¦æ¹é¢å¯ä»¥æå PostgreSQL çæ½è½ã |
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3.4)PostgreSQL 裡å¯ä»¥ç²å¾ä»éº¼æ¨£ç調試ç¹æ§ï¼ |
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æä½åé¡ |
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4.1) å¦ä½åªé¸æä¸åæ¥è©¢çµæçé å¹¾è¡ï¼ææ¯é¨æ©çä¸è¡ï¼ |
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çæ¢ä»¶å¹éï¼PostgreSQL å¯è½å°±åªèçè¦æ±çé å¹¾æ¢è¨éï¼ |
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ï¼å¦åå°å°æ´åæ¥è©¢é²è¡èçç´å°çæéè¦çè¡ï¼ãå¦æå¨å·è¡æ¥è©¢åè½æä¸ç¥é確åçè¨éæ |
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SELECT cols |
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FROM tab |
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ORDER BY random() |
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LIMIT 1 ; |
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4.2) |
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å¦ä½æ¥ç表ãç´¢å¼ãè³æ庫以åç¨æ¶çå®ç¾©ï¼å¦ä½æ¥çpsql裡ç¨å°çæ¥è©¢æ令並顯示å |
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å¨psqlä¸ä½¿ç¨ \dt å½ä»¤ä¾é¡¯ç¤ºè³æ表çå®ç¾©ï¼è¦ç解 psql ä¸ |
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pgsql/src/bin/psql/describe.cï¼å®åæ¬çºçæ psql åææ§å½ä»¤ç輸åºçææ SQL |
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å½ä»¤ãä½ éå¯ä»¥å¸¶ -E é¸é åå psqlï¼ é樣å®å°åå°åºä½ å¨ psql ä¸ |
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æ給åºçå½ä»¤å·è¡æçå§é¨å¯¦é使ç¨ç SQL |
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æ¥è©¢èªå¥ãPostgreSQLä¹æä¾äºä¸åå¼å®¹ SQLç INFORMATION SCHEMA æ¥å£ï¼ |
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å¨ç³»çµ±ä¸ä¹æä¸äºä»¥ pg_ æé ç系統表ä¹æè¿°äºè¡¨çå®ç¾©ã |
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ä¹å¯ä»¥ç覽ä¸ä¸ pgsql/src/tutorial/syscat.source |
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æ件ï¼å®åèäºå¾å¤å¯å¾è³æ庫系統表ä¸ç²åè³è¨çSELECTèªæ³ã |
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4.3) å¦ä½æ´æ¹ä¸åæ¬ä½çè³æé¡åï¼ |
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å¨8.0çæ¬è£¡æ´æ¹ä¸åæ¬ä½çè³æé¡åå¾å®¹æï¼å¯ä½¿ç¨ ALTER TABLE ALTER COLUMN |
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TYPE ã |
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å¨ä»¥åççæ¬ä¸ï¼å¯ä»¥é樣åï¼ |
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BEGIN; |
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ALTER TABLE tab ADD COLUMN new_col new_data_type; |
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UPDATE tab SET new_col = CAST(old_col AS new_data_type); |
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ALTER TABLE tab DROP COLUMN old_col; |
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COMMIT; |
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ä½ ç¶å¾å¯ä»¥ä½¿ç¨ VACUUM FULL tab æ令ä¾ä½¿ç³»çµ±æ¶åç¡æè³ææä½ç¨ç空éã |
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4.4) å®æ¢è¨éï¼å®å表ï¼å®åè³æ庫çæ大éå¶æ¯å¤å°ï¼ |
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ä¸å Postgres è³æ庫ï¼å |
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PostgreSQL è³æé ç大å°æ¯ 8192 ä½åçµ (8 KB)ï¼åï¼ |
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å¨ç³»çµ±è¡¨åå¨ä¸äºé¯èª¤è³è¨è£¡ä½ å°çå°å§é¨å稱ã |
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ä¸é¢æåçåå種é¡åæ¯ "varlena"ï¼è®é·ï¼é¡åï¼ä¹å°±æ¯èªªï¼éé çååå |
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ç¯æ¯é·åº¦ï¼å¾é¢ææ¯è³æï¼ã æ¼æ¯å¯¦éä½ç¨ç空éæ¯è²æç大å°è¦å¤ä¸äºã |
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ç¶èéäºé¡åå¦å®ç¾©å¾é·æé½å¯ä»¥è¢«å£ç¸®åå²ï¼å æ |
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¤ç£ç¤ç©ºéä¹å¯è½æ¯é æ³çè¦å°ã |
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VARCHAR(n) å¨åå²éå¶äºæ大é·åº¦çè®é·å符串æ¯æ好çã TEXT é©ç¨æ¼å |
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å²æ大å¯é 1G å·¦å³ä½æªå®ç¾©éå¶é·åº¦çå符串ã |
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CHAR(n) æé©åæ¼åå²é·åº¦ç¸åçå符串ã |
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CHAR(n)ææ ¹ææ給å®çæ¬ä½é·åº¦ä»¥ç©ºæ ¼è£è¶³ï¼ä¸è¶³çæ¬ä½å§å®¹ï¼ï¼ è |
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VARCHAR(n) åªåå²æ給å®çè³æå§å®¹ã BYTEA ç¨æ¼åå²äºé²å¶è³æï¼å°¤å¶æ¯åå« |
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NULL åç¯çå¼ãéäºé¡åå·æå·®ä¸å¤çæ§è½ã |
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4.11.1) ææ樣åµå»ºä¸ååºåèææ¯èªåéå¢çæ¬ä½ï¼ |
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PostgreSQL æ¯æ SERIAL |
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è³æé¡åãï¼æ¬ä½å®ç¾©çºSERIALå¾ï¼å°èªååµå»ºä¸ååºåçæå¨ï¼ä¾å¦ï¼ |
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CREATE TABLE person ( |
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id SERIAL, |
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name TEXT |
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); |
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æèªåè½æçºä»¥ä¸SQLèªå¥ï¼ |
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CREATE SEQUENCE person_id_seq; |
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CREATE TABLE person ( |
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id INT4 NOT NULL DEFAULT nextval('person_id_seq'), |
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name TEXT |
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); |
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åè create_sequence æåé ç²åéæ¼åºåçæå¨çæ´å¤è³è¨ã |
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4.11.2) æå¦ä½ç²å¾ä¸åæå¥çåºåèçå¼ï¼ |
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ä¸ç¨®æ¹æ³æ¯å¨æå¥ä¹ååç¨å½æ¸ nextval() å¾åºåå°è±¡è£¡æª¢ç´¢åºä¸ä¸å SERIAL |
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å¼ï¼ç¶å¾åç¨æ¤å¼ç²¾ç¢ºå°æå¥ãä½¿ç¨ 4.11.1 裡çä¾è¡¨ï¼å¯ç¨å½ç¢¼é樣æè¿°ï¼ |
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new_id = execute("SELECT nextval('person_id_seq')"); |
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execute("INSERT INTO person (id, name) VALUES (new_id, 'Blaise Pascal')"); |
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é樣éè½å¨å¶ä»æ¥è©¢ä¸ä½¿ç¨åæ¾å¨ new_id 裡çæ°å¼ï¼ä¾å¦ï¼ä½çºåç§ person |
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表çå¤éµï¼ã 注æèªååµå»ºç SEQUENCE å°è±¡çå稱å°ææ¯ |
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<table>_<serialcolumn>_seqï¼ é裡 table å serialcolumn |
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åå¥æ¯ä½ ç表çå稱åä½ ç SERIAL æ¬ä½çå稱ã |
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é¡ä¼¼çï¼å¨ SERIAL å°è±¡é è¨æå¥å¾ä½ å¯ä»¥ç¨å½æ¸ currval() 檢索å賦å¼ç |
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SERIAL å¼ï¼ä¾å¦ï¼ |
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execute("INSERT INTO person (name) VALUES ('Blaise Pascal')"); |
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new_id = execute("SELECT currval('person_id_seq')"); |
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4.11.3) åæä½¿ç¨ currval() æå°è´åå¶ä»ç¨æ¶çè¡çªææ³åï¼ |
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ä¸æãcurrval() è¿åçæ¯ä½ æ¬æ¬¡æ話é²ç¨æ賦çå¼èä¸æ¯ææç¨æ¶çç¶åå¼ã |
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4.11.4) çºä»éº¼ä¸å¨äºåç°å¸¸ä¸æ¢å¾éç¨åºåèå¢ï¼çºä»éº¼å¨åºåèæ¬ä½çåå¼ä¸åå¨éæ·å¢ï¼ |
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çºäºæé«ä½µç¼æ§ï¼åºåèå¨éè¦çæå賦äºæ |
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£å¨éè¡çäºåï¼ä¸¦ä¸å¨äºåçµæä¹åä¸é²è¡éå®ï¼ éå°±æå°è´ç°å¸¸ä¸ |
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æ¢çäºåå¾ï¼åºåèæåºç¾ééã |
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4.12) ä»éº¼æ¯ OID ï¼ä»éº¼æ¯ CTID ï¼ |
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PostgreSQL 裡åµå»ºçæ¯ä¸è¡è¨éé½æç²å¾ä¸åå¯ä¸ç OIDï¼é¤éå¨åµå»ºè¡¨æä½¿ç¨ |
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WITHOUT OIDS é¸é ã OID åµå»ºææèªåçæä¸å 4ä½åçµçæ´æ¸ï¼ææ OID å¨ç¸æ |
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PostgreSQL 伺æå¨ä¸åæ¯å¯ä¸çã ç¶èï¼å®å¨è¶é 40åæå°æº¢åºï¼ OID æ |
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¤å¾æåºç¾éè¤ãPostgreSQL å¨å®çå§é¨ç³»çµ±è¡¨è£¡ä½¿ç¨ OID |
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å¨è¡¨ä¹é建ç«è¯ç¹«ã |
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å¨ç¨æ¶çè³æ表ä¸ï¼æ好æ¯ä½¿ç¨ SERIAl ä¾ä»£æ¿ OID å çº SERIAL åªè¦ä¿è |
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å¨å®å表ä¸çæ¸å¼æ¯å¯ä¸çå°±å¯ä»¥äºï¼é樣å®æº¢åºçå¯è½æ§å°±é常å°äºï¼ |
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SERIAL8 å¯ç¨ä¾ä¿å8ååçµçåºåæ¸å¼ã |
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CTID ç¨æ¼æ¨è帶èè³æå¡ï¼å°åï¼åï¼å¡å§ï¼å移çç¹å®çç©çè¡ã CTID |
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å¨è¨é被æ´æ¹æéè¼å¾ç¼çæ¹è®ãç´¢å¼è³æ使ç¨å®åæåç©çè¡ã |
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4.13) çºä»éº¼ææ¶å°é¯èª¤è³è¨ãERROR: Memory exhausted in AllocSetAlloc()ãï¼ |
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éå¾å¯è½æ¯ç³»çµ±çèæ¬å§åç¨åäºï¼æèå§æ ¸å°æäºè³æºæè¼ä½çéå¶å¼ãå¨åå |
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postmaster ä¹å試試ä¸é¢çå½ä»¤ï¼ |
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ulimit -d 262144 |
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limit datasize 256m |
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å決æ¼ä½ ç¨ç |
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shellï¼ä¸é¢å½ä»¤åªæä¸æ¢è½æåï¼ä½æ¯å®å°æä½ çé²ç¨è³æ段éå¶è¨å¾æ¯è¼é«ï¼ |
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å èä¹è¨±è½è®æ¥è©¢å®æãéæ¢å½ä»¤æç¨æ¼ç¶åé²ç¨ï¼ä»¥åææå¨éæ¢å½ä»¤éè¡å¾åµå»ºç |
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åé²ç¨ã |
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å¦æä½ æ¯å¨éè¡SQL客æ¶ç«¯æå çºå¾å°è¿åäºå¤ªå¤çè³æèåºç¾åé¡ï¼è«å¨éè¡å®¢æ¶ç |
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«¯ä¹åå·è¡ä¸è¿°å½ä»¤ã |
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4.14) æå¦ä½æè½ç¥éæéè¡çPostgreSQLççæ¬ï¼ |
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å¾ psql 裡ï¼è¼¸å¥ SELECT version();æ令ã |
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4.15) æå¦ä½åµå»ºä¸åé è¨å¼æ¯ç¶åæéçæ¬ä½ï¼ |
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ä½¿ç¨ CURRENT_TIMESTAMPï¼ |
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CREATE TABLE test (x int, modtime TIMESTAMP DEFAULT CURRENT_TIMESTAMP ); |
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4.16) ææ樣é²è¡ outer join ï¼å¤é£æ¥ï¼ï¼ |
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PostgreSQL æ¡ç¨æ¨æºç SQL èªæ³æ¯æå¤é£æ¥ãé裡æ¯å©åä¾åï¼ |
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SELECT * |
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FROM t1 LEFT OUTER JOIN t2 ON (t1.col = t2.col); |
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ææ¯ |
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SELECT * |
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FROM t1 LEFT OUTER JOIN t2 USING (col); |
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éå©åçå¹çæ¥è©¢å¨ t1.col å t2.col ä¸åé£æ¥ï¼ä¸¦ä¸è¿å t1 ä¸ |
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æææªé£æ¥çè¡ï¼é£äºå¨ t2 ä¸æ²æå¹éçè¡ï¼ã å³[å¤]é£æ¥ï¼RIGHT OUTER |
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JOINï¼å°è¿å t2 ä¸æªé£æ¥çè¡ã å®å¨å¤é£æ¥ï¼FULL OUTER JOINï¼å°è¿å t1 å t2 |
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ä¸æªé£æ¥çè¡ã ééµå OUTER å¨å·¦[å¤]é£æ¥ãå³[å¤]é£æ¥åå®å¨[å¤]é£æ¥ä¸ |
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æ¯å¯é¸çï¼æ®éé£æ¥è¢«ç¨±çºå§é£æ¥ï¼INNER JOINï¼ã |
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4.17) å¦ä½ä½¿ç¨æ¶åå¤åè³æ庫çæ¥è©¢ï¼ |
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æ²æ辦æ³æ¥è©¢ç¶åè³æ庫ä¹å¤çè³æ庫ã |
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å çºPostgreSQLè¦å è¼èè³æ庫ç¸éç系統ç®éï¼ç³»çµ±è¡¨ï¼ï¼å æ |
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¤è·¨è³æ庫çæ¥è©¢å¦ä½å·è¡æ¯ä¸å®çã |
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éå å¢å¼æ¨¡å¡ contrib/dblink |
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å許æ¡ç¨å½æ¸èª¿ç¨å¯¦ç¾è·¨åº«æ¥è©¢ãç¶ç¶ç¨æ¶ä¹å¯ä»¥åæé£æ¥å°ä¸åçè³æ庫å·è |
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¡æ¥è©¢ç¶å¾å¨å®¢æ¶ç«¯åä½µçµæã |
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4.18) å¦ä½è®å½æ¸è¿åå¤è¡æå¤åè³æï¼ |
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å¨å½æ¸ä¸è¿åè³æè¨ééçåè½æ¯å¾å®¹æ使ç¨çï¼è©³æåè¦ï¼ |
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http://techdocs.postgresql.org/guides/SetReturningFunctions |
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4.19) çºä»éº¼æå¨ä½¿ç¨ PL/PgSQL å½æ¸ååè¨æ表æææ¶å°é¯èª¤è³è¨ãrelation with OID |
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##### does not existãï¼ |
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PL/PgSQL æç·©åå½æ¸çè³æ¬å§å®¹ï¼ç±æ¤å¸¶ä¾çä¸åä¸å¥½çå¯ä½ç¨æ¯è¥ä¸å |
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PL/PgSQL |
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å½æ¸è¨ªåäºä¸åè¨æ表ï¼ç¶å¾è©²è¡¨è¢«åªé¤ä¸¦é建äºï¼åå次調ç¨è©²å½æ¸å°å¤ |
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±æï¼ å çºç·©åçå½æ¸å§å®¹ä»ç¶æåèçè¨æ表ã解決çæ¹æ³æ¯å¨ PL/PgSQL ä¸ |
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ç¨EXECUTE å°è¨æ表é²è¡è¨ªåãé樣æä¿èæ¥è©¢å¨å·è¡å總æ被éæ°è§£æã |
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4.20) ç®åæåªäºè³æè¤å¯«(replication)æ¹æ¡å¯ç¨ï¼ |
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ãè¤å¯«ãåªæ¯ä¸åè¡èªï¼æ好幾種è¤å¯«æè¡å¯ç¨ï¼æ¯ç¨®é½æåªé»å缺é»ï¼ |
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主/å¾å¼è¤å¯«æ¹å¼æ¯å許ä¸å主伺æå¨æ¥åè®/寫çç³è«ï¼èå¤åå¾ä¼ºæå¨åªè½æ¥å |
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è®/SELECTæ¥è©¢çç³è«ï¼ ç®åææµè¡ä¸åè²»ç主/å¾PostgreSQLè¤å¯«æ¹æ¡æ¯ |
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Slony-I ã |
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å¤å主伺æå¨çè¤å¯«æ¹å¼å許å°è®/寫çç³è«ç¼é給å¤å°ç主æ©ï¼é種æ¹å¼ç±æ¼é |
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è¦å¨å¤å°ä¼ºæå¨ä¹éåæ¥è³æè®å å¯è½æ帶ä¾è¼å´éçæ§è½æ失ï¼Pgcluster |
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4.21) çºä½æ¥è©¢çµæ顯示ç表åææ¬åèæçæ¥è©¢èªå¥ä¸çä¸åï¼çºä½å¤§å¯«çæä¸è½ä¿çï¼ |
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æ常è¦çåå æ¯å¨åµå»ºè¡¨æå°è¡¨åææ¯æ¬å使ç¨äºéå¼è( ' ' |
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éæè¬èä½ å¨æ¥è©¢æ表åææ¬åä¹æ使ç¨éå¼èï¼ä¸äºå·¥å·è»é«ï¼å pgAdmin |
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æå¨ç¼åºåµå»ºè¡¨çæ令æèªåå°å¨æ¯åæ¨è符ä¸å éå¼èã å æ¤ï¼çºäºæ¨è |
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* å¨åµå»ºè¡¨æé¿åå°æ¨è符使ç¨éå¼èå¼èµ·ä¾ã |
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Bruce Momjian
19 years ago