{ "ml": { "v": "4", "fs": [ { "id": 0, "prob": 0.2832695245742798, "class": 0 } ], "prob": 0.28326952, "class": 0, "models": [ { "m": "az", "prob": 0.28326952, "class": 0 } ], "version": "v17.17", "thresholds": [ 0.999503, 0.9998882 ], "analyzed_at": "2026-05-26T13:59:24Z" }, "path": "innodb-implementation-of-mvcc.md", "raw": { "v": "5", "fs": [ { "f": "O(C)Md", "x": 2, "ff": { "m": { "file": { "size": 18844.0, "entropy": 6.45, "size_bytes": 18844.0 } }, "s": [ [ 4, "u8", "title: InnoDB" ], [ 46, "u8", "description:" ], [ 71, "u8", "InnoDB" ], [ 128, "u8", "do l" ], [ 129, "u8", "undo log" ], [ 149, "u8", "ReadView" ], [ 211, "u8", "MySQL" ], [ 269, "u8", "- MySQL" ], [ 285, "u8", "- - meta" ], [ 296, "u8", "- name: keywords" ], [ 317, "u8", "content: MVCC," ], [ 472, "u8", "(Multi-Version Concurrency Control)" ], [ 877, "u8", "SELECT" ], [ 1546, "u8", "INSERT" ], [ 1555, "u8", "UPDATE" ], [ 1564, "u8", "DELETE" ], [ 2967, "u8", "Consistent Nonlocking Reads" ], [ 2997, "u8", "**](https://dev.mysql.com/doc/refman/5.7/en/innodb-consistent-read.html)" ], [ 3352, "u8", "`InnoDB`" ], [ 3396, "u8", "(multi versioning)](https://dev.mysql.com/doc/refman/5.7/en/innodb-multi-versioning.html)" ], [ 3550, "u8", "`DELETE`" ], [ 3563, "u8", "`UPDATE`" ], [ 3771, "u8", "(snapshot read)" ], [ 3792, "u8", "`Repeatable Read`" ], [ 3814, "u8", "`Read Committed`" ], [ 3880, "u8", "`select`" ], [ 3908, "u8", "`select ... lock in share mode` ,`select ... for update`" ], [ 4048, "u8", "`MVCC`" ], [ 4170, "u8", "Locking Reads" ], [ 4186, "u8", "**](https://dev.mysql.com/doc/refman/5.7/en/innodb-locking-reads.html)" ], [ 4258, "u8", "- `select ... lock in share mode`" ], [ 4292, "u8", "- `select ... for update`" ], [ 4318, "u8", "- `insert`" ], [ 4331, "u8", "`update`" ], [ 4342, "u8", "`delete`" ], [ 4448, "u8", "current read" ], [ 4665, "u8", "`insert`" ], [ 5112, "u8", "Read View" ], [ 5455, "u8", "`Next-key Lock`" ], [ 5611, "u8", "undo log**" ], [ 5672, "u8", "`DB_TRX_ID`" ], [ 5688, "u8", "`Read View`" ], [ 5767, "u8", "`DB_ROLL_PTR`" ], [ 5788, "u8", "`undo log`" ], [ 6102, "u8", "](https://dev.mysql.com/doc/refman/5.7/en/innodb-multi-versioning.html)" ], [ 6178, "u8", "- `DB_TRX_ID" ], [ 6336, "u8", "`Record header`" ], [ 6359, "u8", "`deleted_flag`" ], [ 6406, "u8", "- `DB_ROLL_PTR" ], [ 6517, "u8", "- `DB_ROW_ID" ], [ 6657, "u8", "### ReadView" ], [ 6676, "u8", "class ReadView {" ], [ 6714, "u8", "trx_id_t m_low_limit_id; /*" ], [ 6797, "u8", "trx_id_t m_up_limit_id; /*" ], [ 6871, "u8", "trx_id_t m_creator_trx_id; /*" ], [ 6942, "u8", "trx_id_t m_low_limit_no; /*" ], [ 7001, "u8", "Number" ], [ 7012, "u8", "Undo Logs" ], [ 7035, "u8", "Purge */" ], [ 7046, "u8", "ids_t m_ids; /*" ], [ 7127, "u8", "m_closed; /*" ], [ 7185, "u8", "close */" ], [ 7202, "u8", "[`Read View`](https://github.com/facebook/mysql-8.0/blob/8.0/storage/innobase/include/read0types.h#L298)" ], [ 7630, "u8", "`m_ids`" ], [ 7690, "u8", "`m_up_limit_id`" ], [ 7710, "u8", "`m_low_limit_id`" ], [ 8173, "url", "](https://leviathan.vip/2019/03/20/InnoDB的事务分析-MVCC/#MVCC-1)" ], [ 8281, "u8", "![trans_visible](./images/mvvc/trans_visible.png)" ], [ 8332, "u8", "### undo-log" ], [ 8710, "u8", "`insert undo log`" ], [ 8731, "u8", "`update undo log`" ], [ 8756, "u8", "1. **`insert undo log`**" ], [ 8988, "u8", "`purge`" ], [ 9047, "u8", "![](./images/mvvc/317e91e1-1ee1-42ad-9412-9098d5c6a9ad.png)" ], [ 9108, "u8", "2. **`update undo log`**" ], [ 9402, "u8", "![](./images/mvvc/c52ff79f-10e6-46cb-b5d4-3c9cbcc1934a.png)" ], [ 9499, "u8", "![](./images/mvvc/6a276e7a-b0da-4c7b-bdf7-c0c7b7b3b31c.png)" ], [ 9971, "u8", "commit" ], [ 10351, "u8", "](https://github.com/facebook/mysql-8.0/blob/8.0/storage/innobase/include/read0types.h#L161)" ], [ 10457, "url", "](https://leviathan.vip/2019/03/20/InnoDB的事务分析-MVCC/#MVCC-1))" ], [ 10563, "u8", "![](./images/mvvc/8778836b-34a8-480b-b8c7-654fe207a8c2.png)" ], [ 10639, "u8", "DB_TRX_ID \u003c m_up_limit_id" ], [ 10710, "u8", "DB_TRX_ID" ], [ 10832, "u8", "DB_TRX_ID \u003e= m_low_limit_id" ], [ 11035, "u8", "3. m_ids" ], [ 11202, "u8", "m_up_limit_id \u003c= DB_TRX_ID \u003c m_low_limit_id" ], [ 11958, "u8", "trx_id" ], [ 12133, "u8", "DB_ROLL_PTR" ], [ 12375, "u8", "`RC`" ], [ 12384, "u8", "`RR`" ], [ 12631, "u8", "`Read View` (m_ids" ], [ 12778, "u8", "## MVCC" ], [ 12978, "u8", "![](./images/mvvc/6fb2b9a1-5f14-4dec-a797-e4cf388ed413.png)" ], [ 13161, "u8", "![](./images/mvvc/a3fd1ec6-8f37-42fa-b090-7446d488fd04.png)" ], [ 13324, "u8", "`103`" ], [ 13464, "u8", "`m_creator_trx_id`" ], [ 13540, "u8", "m_up_limit_id \u003c= 101 \u003c m_low_limit_id" ], [ 13852, "u8", "1 \u003c m_up_limit_id" ], [ 13917, "u8", "`name =" ], [ 13990, "u8", "![](./images/mvvc/528559e9-dae8-4d14-b78d-a5b657c88391.png)" ], [ 14351, "u8", "m_up_limit_id \u003c= 102 \u003c m_low_limit_id" ], [ 14611, "u8", "101 \u003c m_up_limit_id" ], [ 14658, "u8", "`T6`" ], [ 14828, "u8", "![](./images/mvvc/6f82703c-36a1-4458-90fe-d7f4edbac71a.png)" ], [ 14989, "u8", "m_up_limit_id = m_low_limit_id = 104" ], [ 15067, "u8", "102 \u003c m_low_limit_id" ], [ 15475, "u8", "![](./images/mvvc/0e906b95-c916-4f30-beda-9cb3e49746bf.png)" ], [ 16218, "u8", "![](./images/mvvc/79ed6142-7664-4e0b-9023-cf546586aa39.png)" ], [ 17061, "u8", "![](./images/mvvc/cbbedbc5-0e3c-4711-aafd-7f3d68a4ed4e.png)" ], [ 17293, "u8", "Next-key-Lock" ], [ 17817, "u8", "select...for update/lock in share mode" ], [ 17859, "u8", "insert" ], [ 17868, "u8", "update" ], [ 17877, "u8", "delete" ], [ 18074, "u8", "[Next-key Lock](https://dev.mysql.com/doc/refman/5.7/en/innodb-locking.html#innodb-next-key-locks)" ], [ 18457, "u8", "- [Innodb" ], [ 18506, "u8", "](https://tech.meituan.com/2014/08/20/innodb-lock.html)" ], [ 18613, "u8", "](https://blog.csdn.net/qq_35190492/article/details/109044141)" ], [ 18676, "u8", "- [InnoDB" ], [ 18698, "url", "-MVCC](https://leviathan.vip/2019/03/20/InnoDB的事务分析-MVCC/)" ], [ 18742, "xor", "(.I)[IU-ITXI)XI.-IT.I)YIT-I-]I)YITTITZI)ZIU)IU\\A!://CEffPMAAL," ], [ 18798, "u8", "\u003c!-- @include: @article-footer.snippet.md --\u003e" ] ], "id": "markdown" }, "id": 0, "sz": 18844, "ts": [ { "c": 0.7200000286102295, "d": "HTML comment marker", "e": [ "\u003c!--" ], "i": "micro-behaviors/data/format/html::comment", "l": 1 }, { "a": "T1071", "c": 0.800000011920929, "d": "URL with .vip TLD (commonly abused)", "e": [ "https://leviathan.vip/" ], "i": "objectives/command-and-control/infrastructure/domain/abused-tlds::tld-vip", "l": 3 }, { "c": 0.8999999761581421, "d": "Encoded payload detected: url", "e": [ "](https://leviathan.vip/2019/03/20/InnoD \u003curl\u003e", "-MVCC](https://leviathan.vip/2019/03/20/ \u003curl\u003e" ], "i": "metadata/encoded-payload/url", "l": 3 } ], "sha": "66a39b1e8897ef82978a53ab5ba01691d29e38dbbe8097b019249139a6c093e1", "path": "innodb-implementation-of-mvcc.md", "type": "markdown" } ], "tv": "9ad70" } }