Ever wonder what is stored in InnoDB buffer pool at the moment ?
It is not so hard actually – we made a short patch for MySQL 5.0 which show innodb buffer pool content
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mysql> select * from information_schema.INNODB_BUFFER_POOL_CONTENT; +-----------+-------+--------+---------+----------+------------+-----------+--------------+--------------+----------------+-----------------+--------------+------------------+ | BLOCK_NUM | SPACE | OFFSET | RECORDS | DATASIZE | FLUSH_TYPE | FIX_COUNT | LRU_POSITION | PAGE_TYPE_ID | PAGE_TYPE | INDEX_NAME | TABLE_SCHEMA | TABLE_NAME | +-----------+-------+--------+---------+----------+------------+-----------+--------------+--------------+----------------+-----------------+--------------+------------------+ | 0 | 0 | 7 | 0 | 0 | 0 | 0 | 2 | 6 | unknown | | | | | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 3 | 5 | unknown | | | | | 2 | 0 | 3 | 0 | 0 | 0 | 0 | 4 | 6 | unknown | | | | | 3 | 0 | 2 | 0 | 0 | 0 | 0 | 5 | 3 | inode | | | | | 4 | 0 | 4 | 0 | 0 | 0 | 0 | 6 | 17855 | index | CLUST_IND | | SYS_IBUF_TABLE_0 | | 5 | 0 | 11 | 23 | 1560 | 0 | 0 | 7 | 17855 | index | CLUST_IND | | SYS_INDEXES | | 6 | 0 | 5 | 242 | 0 | 3 | 0 | 8 | 7 | unknown | | | | | 7 | 0 | 6 | 3006 | 0 | 0 | 0 | 9 | 6 | unknown | | | | | 8 | 0 | 45 | 0 | 0 | 0 | 0 | 10 | 2 | undo_log | | | | | 9 | 0 | 50 | 0 | 0 | 0 | 0 | 11 | 2 | undo_log | | | | | 10 | 0 | 8 | 12 | 894 | 0 | 0 | 12 | 17855 | index | CLUST_IND | | SYS_TABLES | | 11 | 0 | 0 | 0 | 0 | 0 | 0 | 13 | 8 | unknown | | | | | 12 | 0 | 10 | 93 | 5864 | 0 | 0 | 14 | 17855 | index | CLUST_IND | | SYS_COLUMNS | | 13 | 0 | 9 | 12 | 354 | 0 | 0 | 15 | 17855 | index | ID_IND | | SYS_TABLES | | 14 | 0 | 12 | 32 | 1313 | 0 | 0 | 16 | 17855 | index | CLUST_IND | | SYS_FIELDS | | 47 | 0 | 46 | 0 | 0 | 0 | 0 | 49 | 17855 | index | ID_IND | | SYS_FOREIGN | | 48 | 0 | 47 | 0 | 0 | 0 | 0 | 50 | 17855 | index | FOR_IND | | SYS_FOREIGN | | 49 | 0 | 48 | 0 | 0 | 0 | 0 | 51 | 17855 | index | REF_IND | | SYS_FOREIGN | | 50 | 0 | 49 | 0 | 0 | 0 | 0 | 52 | 17855 | index | ID_IND | | SYS_FOREIGN_COLS | | 51 | 0 | 51 | 14 | 1589 | 0 | 0 | 53 | 17855 | index | CLUST_IND | | SYS_IBUF_TABLE_0 | | 52 | 0 | 52 | 138 | 16037 | 0 | 0 | 54 | 17855 | index | CLUST_IND | | SYS_IBUF_TABLE_0 | | 53 | 0 | 53 | 72 | 8148 | 0 | 0 | 55 | 17855 | index | CLUST_IND | | SYS_IBUF_TABLE_0 | | 54 | 0 | 54 | 55 | 6313 | 0 | 0 | 56 | 17855 | index | CLUST_IND | | SYS_IBUF_TABLE_0 | | 55 | 0 | 55 | 39 | 3959 | 0 | 0 | 57 | 17855 | index | CLUST_IND | | SYS_IBUF_TABLE_0 | | 56 | 0 | 56 | 24 | 2816 | 0 | 0 | 58 | 17855 | index | CLUST_IND | | SYS_IBUF_TABLE_0 | | 57 | 0 | 57 | 286 | 0 | 0 | 0 | 59 | 4 | ibuf_free_list | | | | | 58 | 0 | 58 | 928 | 0 | 0 | 0 | 60 | 4 | ibuf_free_list | | | | | 59 | 0 | 59 | 64 | 0 | 0 | 0 | 61 | 4 | ibuf_free_list | | | | | 60 | 0 | 60 | 132 | 0 | 0 | 0 | 62 | 4 | ibuf_free_list | | | | | 61 | 0 | 61 | 69 | 0 | 0 | 0 | 63 | 4 | ibuf_free_list | | | | | 62 | 0 | 62 | 44 | 0 | 0 | 0 | 64 | 4 | ibuf_free_list | | | | | 63 | 0 | 63 | 44 | 0 | 0 | 0 | 65 | 2 | undo_log | | | | | 64 | 17 | 3 | 4 | 60 | 0 | 0 | 66 | 17855 | index | GEN_CLUST_INDEX | art | a87 | | 66 | 17 | 2 | 0 | 0 | 0 | 0 | 68 | 3 | inode | | | | | 67 | 17 | 38 | 1048 | 15720 | 0 | 0 | 69 | 17855 | index | GEN_CLUST_INDEX | art | a87 | | 68 | 17 | 1715 | 128 | 15077 | 0 | 0 | 70 | 17855 | index | GEN_CLUST_INDEX | art | a87 | | 69 | 17 | 37 | 1048 | 15720 | 0 | 0 | 71 | 17855 | index | GEN_CLUST_INDEX | art | a87 | | 70 | 17 | 886 | 134 | 15147 | 0 | 0 | 72 | 17855 | index | GEN_CLUST_INDEX | art | a87 | | 71 | 17 | 36 | 524 | 7860 | 0 | 0 | 73 | 17855 | index | GEN_CLUST_INDEX | art | a87 | | 72 | 17 | 29 | 137 | 15085 | 0 | 0 | 74 | 17855 | index | GEN_CLUST_INDEX | art | a87 | | 73 | 17 | 39 | 155 | 2325 | 0 | 0 | 75 | 17855 | index | GEN_CLUST_INDEX | art | a87 | | 74 | 17 | 2670 | 130 | 15114 | 0 | 0 | 76 | 17855 | index | GEN_CLUST_INDEX | art | a87 | | 75 | 17 | 2591 | 117 | 15112 | 0 | 0 | 77 | 17855 | index | GEN_CLUST_INDEX | art | a87 | | 76 | 17 | 714 | 146 | 15067 | 0 | 0 | 78 | 17855 | index | GEN_CLUST_INDEX | art | a87 | | 77 | 17 | 409 | 142 | 15110 | 0 | 0 | 79 | 17855 | index | GEN_CLUST_INDEX | art | a87 | | 78 | 17 | 2739 | 133 | 15110 | 0 | 0 | 80 | 17855 | index | GEN_CLUST_INDEX | art | a87 | | 79 | 1 | 3 | 3 | 39 | 0 | 0 | 81 | 17855 | index | PRIMARY | art | author87 | | 80 | 1 | 1 | 0 | 0 | 0 | 0 | 51 | 5 | unknown | | | | | 81 | 1 | 2 | 0 | 0 | 0 | 0 | 51 | 3 | inode | | | | | 82 | 1 | 137 | 807 | 10491 | 0 | 0 | 51 | 17855 | index | PRIMARY | art | author87 | | 83 | 1 | 3491 | 140 | 15095 | 0 | 0 | 51 | 17855 | index | PRIMARY | art | author87 | | 84 | 1 | 3799 | 139 | 15144 | 0 | 0 | 51 | 17855 | index | PRIMARY | art | author87 | | 85 | 1 | 2852 | 173 | 15070 | 0 | 0 | 51 | 17855 | index | PRIMARY | art | author87 | | 86 | 1 | 3096 | 167 | 15054 | 0 | 0 | 51 | 17855 | index | PRIMARY | art | author87 | | 87 | 1 | 3340 | 286 | 15082 | 0 | 0 | 51 | 17855 | index | PRIMARY | art | author87 | | 88 | 1 | 3648 | 138 | 15127 | 0 | 0 | 51 | 17855 | index | PRIMARY | art | author87 | | 89 | 1 | 3892 | 151 | 15088 | 0 | 0 | 51 | 17855 | index | PRIMARY | art | author87 | | 90 | 1 | 3009 | 187 | 15119 | 0 | 0 | 51 | 17855 | index | PRIMARY | art | author87 | | 91 | 1 | 4 | 3 | 102 | 0 | 0 | 51 | 17855 | index | site_id | art | author87 | | 92 | 1 | 138 | 360 | 11649 | 0 | 0 | 51 | 17855 | index | site_id | art | author87 | | 93 | 1 | 3255 | 354 | 9201 | 0 | 0 | 51 | 17855 | index | site_id | art | author87 | | 94 | 1 | 1534 | 309 | 10506 | 0 | 0 | 51 | 17855 | index | site_id | art | author87 | | 95 | 1 | 3440 | 328 | 8198 | 0 | 0 | 51 | 17855 | index | site_id | art | author87 | | 96 | 1 | 479 | 498 | 11689 | 0 | 0 | 51 | 17855 | index | site_id | art | author87 | | 97 | 1 | 3246 | 346 | 8981 | 0 | 0 | 51 | 17855 | index | site_id | art | author87 | | 98 | 1 | 2518 | 427 | 11450 | 0 | 0 | 51 | 17855 | index | site_id | art | author87 | | 99 | 1 | 2070 | 316 | 8273 | 0 | 0 | 51 | 17855 | index | site_id | art | author87 | | 100 | 1 | 3259 | 324 | 8988 | 0 | 0 | 51 | 17855 | index | site_id | art | author87 | | 101 | 1 | 135 | 601 | 7813 | 0 | 0 | 51 | 17855 | index | PRIMARY | art | author87 | | 102 | 1 | 5 | 140 | 7812 | 0 | 0 | 51 | 17855 | index | PRIMARY | art | author87 | | 103 | 1 | 6 | 286 | 15067 | 0 | 0 | 51 | 17855 | index | PRIMARY | art | author87 | | 122 | 1 | 32 | 94 | 15024 | 0 | 0 | 51 | 17855 | index | PRIMARY | art | author87 | +-----------+-------+--------+---------+----------+------------+-----------+--------------+--------------+----------------+-----------------+--------------+------------------+ 90 rows in set (0.01 sec |
The binaries, RPMS (RedHat/Centos) and full source code also available to download
P.S. There is Jeremy Cole’s patch for InnoDB plugin MySQL 5.1, and main idea was taken from there.
About the Author
Vadim TkachenkoVadim Tkachenko co-founded Percona in 2006 and serves as its Chief Technology Officer. Vadim leads Percona Labs, which focuses on technology research and performance evaluations of Percona’s and third-party products. Vadim’s expertise in LAMP performance and multi-threaded programming help optimize MySQL and InnoDB internals to take full advantage of modern hardware. He also co-authored the book High Performance MySQL: Optimization, Backups, and Replication 3rd Edition.
This is great! Can we expect to see this coming out in the Percona 5.1 binaries as well?
Is this patch also for the 5.0.68 Percona release available?
Gregory:
I think in 5.1 we will include Jeremey Cole’s patch
Nils,
It is only for 5.0.67, will release for 5.0.68 later
I am looking for a similar tool for the ibdata and ibd files – somethings that dumps page numbers and for each page tells me what the page is and does.
Isotopp,
It is on our todo, will implement it when we can 🙂
I am getting “404 Page Not Found” error when trying to download the batch. Please help me to download the same.
je vous remercie de partager, très gentil de votre part