{"id":885,"date":"2020-10-19T13:40:49","date_gmt":"2020-10-19T05:40:49","guid":{"rendered":"https:\/\/raksmart.cn\/blog\/?p=885"},"modified":"2020-10-19T13:42:59","modified_gmt":"2020-10-19T05:42:59","slug":"mysql%e4%b8%8e%e4%ba%8b%e5%8a%a1","status":"publish","type":"post","link":"https:\/\/raksmart.cn\/blog\/server\/dlfwq\/885.html","title":{"rendered":"Mysql\u4e0e\u4e8b\u52a1"},"content":{"rendered":"\n

\u4f5c\u4e3a\u7f51\u7ad9\u7684\u4f18\u5316\u4e13\u5458\uff0c\u6bcf\u5929\u80af\u5b9a\u8981\u5b66\u4e60\u4e00\u4e9b\u65b0\u4e1c\u897f\u63d0\u5347\u81ea\u5df1\u7684\u6280\u80fd\uff0c\u672c\u6587Raksmart\u7f8e\u56fd\u670d\u52a1\u5668<\/a><\/strong>\u5c31Mysql\u4e0e\u4e8b\u52a1\u7b80\u5355\u4ecb\u7ecd\u4e00\u4e0b\uff0c\u5185\u5bb9\u4ec5\u4f9b\u53c2\u8003\uff1a <\/p>\n\n\n\n

\u4ec0\u4e48\u662f\u4e8b\u52a1<\/strong>\uff1f
\u4e8b\u52a1\u662f\u4f5c\u4e3a\u4e00\u4e2a\u903b\u8f91\u5355\u5143\u6267\u884c\u7684\u4e00\u7cfb\u5217\u64cd\u4f5c\uff0c\u4e00\u4e2a\u903b\u8f91\u5de5\u4f5c\u5355\u5143\u5fc5\u987b\u6709\u56db\u4e2a\u5c5e\u6027\uff0c\u79f0\u4e3a ACID\uff08\u539f\u5b50\u6027\u3001\u4e00\u81f4\u6027\u3001\u9694\u79bb\u6027\u548c\u6301\u4e45\u6027\uff09\u5c5e\u6027\uff0c\u53ea\u6709\u8fd9\u6837\u624d\u80fd\u6210\u4e3a\u4e00\u4e2a\u4e8b\u52a1
\u4e00\u3001\u4e8b\u52a1\u7684\u7279\u6027\uff08ACID<\/strong>\uff09<\/p>\n\n\n\n

\u539f\u5b50\u6027\uff08Atomicity\uff09<\/p>\n\n\n\n

\u4e00\u7ec4\u64cd\u4f5c\u00b7\u8981\u4e48\u5168\u6210\u529f\uff0c\u8981\u4e48\u5168\u5931\u8d25\u3002<\/p>\n\n\n\n

\u4e00\u81f4\u6027\uff08Consistency\uff09<\/p>\n\n\n\n

\u4fdd\u8bc1\u6570\u636e\u7684\u6b63\u786e\u6027\uff0c\u5408\u7406\u6027\uff0c\u5b8c\u6574\u6027\u3002\u4e8b\u52a1\u5728\u5b8c\u6210\u65f6\uff0c\u5fc5\u987b\u4f7f\u6240\u6709\u7684\u6570\u636e\u90fd\u4fdd\u6301\u4e00\u81f4\u72b6\u6001<\/p>\n\n\n\n

\u4f8b\u5982\uff0c\u5728\u4e00\u6b21\u8f6c\u8d26\u8fc7\u7a0b\u4e2d\uff0c\u4ece\u67d0\u4e00\u8d26\u6237\u4e2d\u6263\u9664\u7684\u91d1\u989d\u5fc5\u987b\u4e0e\u53e6\u4e00\u8d26\u6237\u4e2d\u5b58\u5165\u7684\u91d1\u989d\u76f8\u7b49\u3002<\/p>\n\n\n\n

\u9694\u79bb\u6027\uff08Isolation\uff09<\/p>\n\n\n\n

\u4e00\u4e2a\u4f1a\u8bdd\u4e0d\u80fd\u4fee\u6539\u53e6\u4e00\u4e2a\u7528\u6237\u4fee\u6539\u4e86\u4f46\u672a\u63d0\u4ea4\u7684\u6570\u636e\u3002<\/p>\n\n\n\n

\u6301\u4e45\u6027\uff08Durability\uff09<\/p>\n\n\n\n

\u4e00\u4e2a\u4e8b\u7269\u4e00\u65e6\u63d0\u4ea4\uff0c\u6570\u636e\u5e93\u7684\u6570\u636e\u6240\u53d1\u751f\u7684\u53d8\u5316\u662f\u6c38\u4e45\u7684\u3002<\/p>\n\n\n\n

\u4e8c\u3001\u4e8b\u52a1\u7684\u9694\u79bb\u7ea7\u522b<\/strong><\/p>\n\n\n\n

\u4e00\u822c\u6570\u636e\u5e93\u4e2d\uff0c\u6709\u56db\u79cd\u9694\u79bb\u7ea7\u522b
\n<\/p>\n\n\n\n

\"\u4e8b\u52a1\u7684\u56db\u79cd\u9694\u79bb\u7ea7\u522b\"<\/figure>\n\n\n\n

\u5982\u4e0a\u56fe\uff0c\u56db\u79cd\u9694\u79bb\u7ea7\u522b\u5206\u522b\u5b9e\u73b0\u4e86\u4e0d\u540c\u7684\u529f\u80fd\uff0c\u770b\u662f\u7ea7\u522b\u8d8a\u9ad8\u4e5f\u4ee3\u8868\u7740\u9700\u8981\u7684\u9501\u8d8a\u591a\uff0c\u66f4\u5bb9\u6613\u4ea7\u751f\u963b\u585e\u3002<\/p>\n\n\n\n

\u63a5\u4e0b\u6765\u901a\u8fc7\u5b9e\u9a8c\u4ecb\u7ecd\u8fd9\u51e0\u79cd\u8bfb<\/strong><\/p>\n\n\n\n

\uff081\uff09\u810f\u8bfb<\/p>\n\n\n\n

\u628a\u9694\u79bb\u7ea7\u522b\u8c03\u4e3aREAD-UNCOMMITTED<\/p>\n\n\n\n

root@localhost:mysql.sock \n01:30:05 [(none)]>set global tx_isolation = ‘READ-UNCOMMITTED’;<\/p>\n\n\n\n

root@localhost:mysql.sock \n01:30:22 [(none)]>show global variables like ‘%iso%’;<\/p>\n\n\n\n

+—————+——————+<\/p>\n\n\n\n

| Variable_name\n| Value            |<\/p>\n\n\n\n

+—————+——————+<\/p>\n\n\n\n

|\ntx_isolation  | READ-UNCOMMITTED |<\/p>\n\n\n\n

+—————+——————+<\/p>\n\n\n\n

1 row in set\n(0.00 sec)<\/p>\n\n\n\n

\u4f1a\u8bdd1\uff1a<\/p>\n\n\n\n

root@localhost:mysql.sock \n01:34:06 [lala]>select * from score;<\/p>\n\n\n\n

Empty set (0.00\nsec)<\/p>\n\n\n\n

root@localhost:mysql.sock \n01:34:53 [lala]>begin;<\/p>\n\n\n\n

Query OK, 0 rows\naffected (0.00 sec)<\/p>\n\n\n\n

root@localhost:mysql.sock \n01:35:23 [lala]>insert into score values(1,’xiaohong’,99);<\/p>\n\n\n\n

Query OK, 1 row\naffected (0.00 sec)<\/p>\n\n\n\n

\u8fd8\u6ca1\u6709\u63d0\u4ea4<\/p>\n\n\n\n

\u4f1a\u8bdd2\uff1a<\/p>\n\n\n\n

root@localhost:mysql.sock \n01:37:08 [lala]>select * from score;<\/p>\n\n\n\n

+——+———-+——-+<\/p>\n\n\n\n

| id \n | name     | score |<\/p>\n\n\n\n

+——+———-+——-+<\/p>\n\n\n\n

|    1\n| xiaohong |    99 |<\/p>\n\n\n\n

+——+———-+——-+<\/p>\n\n\n\n

1 row in set\n(0.00 sec)<\/p>\n\n\n\n

\u4f1a\u8bdd2\u53ef\u4ee5\u76f4\u63a5\u8bfb\u5230\u4f1a\u8bdd1\u8fd8\u6ca1\u6709\u63d0\u4ea4\u7684\u6570\u636e\u3002<\/p>\n\n\n\n

\uff082\uff09\u4e0d\u53ef\u91cd\u590d\u8bfb<\/p>\n\n\n\n

root@localhost:mysql.sock \n01:30:05 [(none)]>set global tx_isolation = ‘READ-COMMITTED’;<\/p>\n\n\n\n

root@localhost:mysql.sock \n01:30:22 [(none)]>show global variables like ‘%iso%’;<\/p>\n\n\n\n

+—————+——————+<\/p>\n\n\n\n

| Variable_name\n| Value            |<\/p>\n\n\n\n

+—————+——————+<\/p>\n\n\n\n

|\ntx_isolation  | READ-COMMITTED |<\/p>\n\n\n\n

+—————+——————+<\/p>\n\n\n\n

1 row in set\n(0.00 sec)<\/p>\n\n\n\n

\u4f1a\u8bdd1\uff1a<\/p>\n\n\n\n

root@localhost:mysql.sock \n01:49:00 [lala]>begin;<\/p>\n\n\n\n

Query OK, 0 rows\naffected (0.00 sec)<\/p>\n\n\n\n

root@localhost:mysql.sock \n01:49:08 [lala]>update score set id=3;<\/p>\n\n\n\n

Query OK, 1 row\naffected (0.00 sec)<\/p>\n\n\n\n

\u4f1a\u8bdd2\uff1a<\/p>\n\n\n\n

root@localhost:mysql.sock \n01:49:14 [lala]>select * from score;<\/p>\n\n\n\n

+——+———-+——-+<\/p>\n\n\n\n

| id \n | name     | score |<\/p>\n\n\n\n

+——+———-+——-+<\/p>\n\n\n\n

|    1\n| xiaohong |    99 |<\/p>\n\n\n\n

+——+———-+——-+<\/p>\n\n\n\n

1 row in set\n(0.00 sec)<\/p>\n\n\n\n

\u4f1a\u8bdd1\uff1a<\/p>\n\n\n\n

root@localhost:mysql.sock \n01:49:20 [lala]>commit;<\/p>\n\n\n\n

Query OK, 0 rows\naffected (0.00 sec)<\/p>\n\n\n\n

\u4f1a\u8bdd2\uff1a<\/p>\n\n\n\n

root@localhost:mysql.sock \n01:49:47 [lala]>select * from score;<\/p>\n\n\n\n

+——+———-+——-+<\/p>\n\n\n\n

| id \n | name     | score |<\/p>\n\n\n\n

+——+———-+——-+<\/p>\n\n\n\n

|    3\n| xiaohong |    99 |<\/p>\n\n\n\n

+——+———-+——-+<\/p>\n\n\n\n

1 row in set\n(0.00 sec)<\/p>\n\n\n\n

\u4f1a\u8bdd2\u7b2c\u4e00\u6b21\u53ea\u8bfb\u5230id\u7684\u503c\u662f1\uff0c\u4f46\u4ee5\u4e3a\u4f1a\u8bdd1\u63d0\u4ea4\uff0c\u4f1a\u8bdd2\u7b2c\u4e8c\u6b21\u8bfb\u5230id\u7684\u503c\u662f3.<\/p>\n\n\n\n

\uff083\uff09\u5e7b\u8bfb<\/p>\n\n\n\n

\u4f1a\u8bdd1\uff1a<\/p>\n\n\n\n

root@localhost:mysql.sock \n01:49:00 [lala]>begin;<\/p>\n\n\n\n

Query OK, 0 rows\naffected (0.00 sec)<\/p>\n\n\n\n

root@localhost:mysql.sock \n01:49:08 [lala]>insert into score values(2,’xiaoming’,65);<\/p>\n\n\n\n

Query OK, 1 row\naffected (0.00 sec)<\/p>\n\n\n\n

\u4f1a\u8bdd2\uff1a<\/p>\n\n\n\n

root@localhost:mysql.sock \n01:49:14 [lala]>select * from score;<\/p>\n\n\n\n

+——+———-+——-+<\/p>\n\n\n\n

| id \n | name     | score |<\/p>\n\n\n\n

+——+———-+——-+<\/p>\n\n\n\n

|    1\n| xiaohong |    99 |<\/p>\n\n\n\n

+——+———-+——-+<\/p>\n\n\n\n

1 row in set\n(0.00 sec)<\/p>\n\n\n\n

\u4f1a\u8bdd1\uff1a<\/p>\n\n\n\n

root@localhost:mysql.sock \n01:49:20 [lala]>commit;<\/p>\n\n\n\n

Query OK, 0 rows\naffected (0.00 sec)<\/p>\n\n\n\n

\u4f1a\u8bdd2\uff1a<\/p>\n\n\n\n

root@localhost:mysql.sock \n01:50:27 [lala]>select * from score;<\/p>\n\n\n\n

+——+———-+——-+<\/p>\n\n\n\n

| id \n | name     | score |<\/p>\n\n\n\n

+——+———-+——-+<\/p>\n\n\n\n

|    3\n| xiaohong |    99 |<\/p>\n\n\n\n

|    2\n| xiaoming |    65 |<\/p>\n\n\n\n

+——+———-+——-+<\/p>\n\n\n\n

2 rows in set\n(0.00 sec)<\/p>\n\n\n\n

\u4f1a\u8bdd2\u7b2c\u4e00\u6b21\u53ea\u8bfb\u52301\u6761\u6570\u636e\uff0c\u4f46\u4ee5\u4e3a\u4f1a\u8bdd1\u63d0\u4ea4\uff0c\u4f1a\u8bdd2\u7b2c\u4e8c\u6b21\u8bfb\u5230\u4e24\u6761\u8bb0\u5f55<\/p>\n\n\n\n

ps\uff1a\u4e0d\u53ef\u91cd\u590d\u8bfb\u662f\u56e0\u4e3a\u6570\u636e\u7684update\u5bfc\u81f4\uff0c\u800c\u5e7b\u8bfb\u662f\u56e0\u4e3a\u6570\u636e\u7684delete\u6216\u8005insert\u5bfc\u81f4<\/p>\n\n\n\n

\u4e09\u3001<\/strong>mysql<\/strong>\u4e2d\u7684\u4e8b\u52a1<\/strong><\/p>\n\n\n\n

mysql\u9ed8\u8ba4\u5f00\u542f\u4e8b\u52a1\u81ea\u52a8\u63d0\u4ea4\uff0c\u5373\u6bcf\u6267\u884c\u5b8c\u4e00\u6761sql\u8bed\u53e5\u81ea\u52a8\u63d0\u4ea4\u4e00\u6b21\u3002<\/p>\n\n\n\n

\u90a3\u600e\u4e48\u7981\u7528\u4e8b\u52a1\u81ea\u52a8\u63d0\u4ea4\u5462\uff1f\u5982\u4e0b\uff1a<\/p>\n\n\n\n

session\u7ea7\u522b\uff1a<\/p>\n\n\n\n

set\nautocommit=off;<\/p>\n\n\n\n

\u5c40\u7ea7\u522b\uff1a<\/p>\n\n\n\n

\u65b9\u6cd5\u4e00\uff1aset global init_connect=’set autocommit=0′;<\/p>\n\n\n\n

\u65b9\u6cd5\u4e8c\uff1a\u4fee\u6539\u53c2\u6570\u6587\u4ef6my.cnf<\/p>\n\n\n\n

   \n           [mysqld]<\/p>\n\n\n\n

   \n           init_connect=’set autocommit=0′;<\/p>\n\n\n\n

\u65b9\u6cd5\u4e09\uff1a  \u542f\u52a8mysql\u670d\u52a1\u65f6\uff0c\u52a0\u4e0a\u53c2\u6570 -init_connect=’set autocommit=0′;<\/p>\n\n\n\n

\u4e5f\u53ef\u4ee5\u901a\u8fc7begin\u5f00\u542f\u4e00\u4e2a\u4e8b\u52a1\uff0c\u518d\u901a\u8fc7commit\u63d0\u4ea4\uff1b<\/p>\n\n\n\n

mysql\u7684\u9ed8\u8ba4\u9694\u79bb\u7ea7\u522b<\/p>\n\n\n\n

mysql\u4e2d\u7684innodb\u7684\u4e8b\u52a1\u9ed8\u8ba4\u9694\u79bb\u7ea7\u522b\u662fRepeatable read\uff08\u53ef\u91cd\u590d\u8bfb\uff09\uff0c\u4f46\u662f\u5b83\u4e0d\u662f\u666e\u901a\u7684Repeatable read\uff0c\u5b83\u5728\u53ef\u91cd\u590d\u8bfb\u7684\u57fa\u7840\u4e0a\u907f\u514d\u4e86\u5e7b\u8bfb\u3002\u662f\u901a\u8fc7\u81ed\u540d\u662d\u8457\u7684gop\u9501\u5b9e\u73b0\u4e0d\u53ef\u91cd\u590d\u8bfb\u3002<\/p>\n\n\n\n

myql\u901a\u8fc7tx_isolation\u51b3\u5b9a\u4e8b\u52a1\u9694\u79bb\u7ea7\u522b \uff0c\u53ef\u4ee5\u67e5\u770b\u5f53\u524d\u7684\u53c2\u6570<\/p>\n\n\n\n

root@localhost:mysql.sock \n01:17:04 [(none)]>show global variables like ‘%iso%’;<\/p>\n\n\n\n

+—————+—————-+<\/p>\n\n\n\n

| Variable_name\n| Value          |<\/p>\n\n\n\n

+—————+—————-+<\/p>\n\n\n\n

|\ntx_isolation  | REPEATABLE-READ |<\/p>\n\n\n\n

+—————+—————-+<\/p>\n\n\n\n

1 row in set\n(0.00 sec)<\/p>\n\n\n\n

\u6240\u4ee5\u8981\u60f3\u4fee\u6539mysql\u7684\u4e8b\u52a1\u9694\u79bb\u7ea7\u522b\uff0c\u76f4\u63a5\u4fee\u6539\u8fd9\u4e2a\u53c2\u6570\u5c31\u884c\u4e86\u3002\u66f4\u591a\u5185\u5bb9\u8bf7\u9605\u8bfb\uff1a\u5982\u4f55\u5bfc\u5165\u548c\u5bfc\u51faMYSQL\u6570\u636e\u5e93<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

\u4f5c\u4e3a\u7f51\u7ad9\u7684\u4f18\u5316\u4e13\u5458\uff0c\u6bcf\u5929\u80af\u5b9a\u8981\u5b66\u4e60\u4e00\u4e9b\u65b0\u4e1c\u897f\u63d0\u5347\u81ea\u5df1\u7684\u6280\u80fd\uff0c\u672c\u6587Raksmart\u7f8e\u56fd\u670d\u52a1\u5668\u5c31Mysq… \u7ee7\u7eed\u9605\u8bfb Mysql\u4e0e\u4e8b\u52a1<\/span><\/i><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[10],"tags":[107,52],"aioseo_notices":[],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/raksmart.cn\/blog\/wp-json\/wp\/v2\/posts\/885"}],"collection":[{"href":"https:\/\/raksmart.cn\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/raksmart.cn\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/raksmart.cn\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/raksmart.cn\/blog\/wp-json\/wp\/v2\/comments?post=885"}],"version-history":[{"count":3,"href":"https:\/\/raksmart.cn\/blog\/wp-json\/wp\/v2\/posts\/885\/revisions"}],"predecessor-version":[{"id":890,"href":"https:\/\/raksmart.cn\/blog\/wp-json\/wp\/v2\/posts\/885\/revisions\/890"}],"wp:attachment":[{"href":"https:\/\/raksmart.cn\/blog\/wp-json\/wp\/v2\/media?parent=885"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/raksmart.cn\/blog\/wp-json\/wp\/v2\/categories?post=885"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/raksmart.cn\/blog\/wp-json\/wp\/v2\/tags?post=885"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}