Related to that last quiz. Here’s the SHOW CREATE TABLE output – I’ve only cleaned up the whitespace.<\/p>\n
CREATE TABLE `t1` (\r\n `id` int(11) DEFAULT NULL\r\n) ENGINE=MyISAM DEFAULT CHARSET=latin1 \r\n\/*!50100 PARTITION BY RANGE (id) (\r\n PARTITION p0 VALUES LESS THAN (100) \r\n ENGINE = MyISAM, \r\n PARTITION p1 VALUES LESS THAN MAXVALUE \r\n DATA DIRECTORY = '~\/mysql\/data\/' \r\n ENGINE = MyISAM\r\n) *\/<\/pre>\nNow, pay close attention to the rows inserted:<\/p>\n
mysql> INSERT INTO t1 VALUES (100);\r\nQuery OK, 1 row affected (0.00 sec)\r\n\r\nmysql> SELECT COUNT(*) FROM t1;\r\n+----------+\r\n| COUNT(*) |\r\n+----------+\r\n| 1 |\r\n+----------+\r\n1 row in set (0.00 sec)<\/pre>\nOk, here’s the tricky bit:<\/p>\n
mysql> SELECT * FROM t1;\r\nEmpty set (0.00 sec)<\/pre>\nNo triggers, no BLACKHOLE, no Proxy, no events or other scheduled tasks, no other connections deleting rows, no temporary tables, and I have all the necessary privileges (including to the data directory shown, which exists and isn’t full). It’s all MyISAM, so surely no transactions. No errors or warnings have been reported.<\/p>\n
When you figure it out, don’t do it in your production environment. Bad things happen.<\/p>\n","protected":false},"excerpt":{"rendered":"
Related to that last quiz. Here’s the SHOW CREATE TABLE output – I’ve only cleaned up the whitespace. CREATE TABLE `t1` ( `id` int(11) DEFAULT NULL ) ENGINE=MyISAM DEFAULT CHARSET=latin1 \/*!50100 PARTITION BY RANGE (id) ( PARTITION p0 VALUES LESS THAN (100) ENGINE = MyISAM, PARTITION p1 VALUES LESS THAN MAXVALUE DATA DIRECTORY = ‘~\/mysql\/data\/’ […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[6],"tags":[],"class_list":["post-71","post","type-post","status-publish","format-standard","hentry","category-gotchas"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p2IBF1-19","jetpack_sharing_enabled":true,"jetpack-related-posts":[],"_links":{"self":[{"href":"https:\/\/thenoyes.com\/littlenoise\/index.php?rest_route=\/wp\/v2\/posts\/71","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/thenoyes.com\/littlenoise\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/thenoyes.com\/littlenoise\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/thenoyes.com\/littlenoise\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/thenoyes.com\/littlenoise\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=71"}],"version-history":[{"count":0,"href":"https:\/\/thenoyes.com\/littlenoise\/index.php?rest_route=\/wp\/v2\/posts\/71\/revisions"}],"wp:attachment":[{"href":"https:\/\/thenoyes.com\/littlenoise\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=71"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/thenoyes.com\/littlenoise\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=71"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/thenoyes.com\/littlenoise\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=71"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}