June 19, 2013

Post: Choosing a MySQL HA Solution - Post-Webinar Q&A

…: Incorrect information in file: ‘./mysql/servers.frm‘ ERROR: 1033 Incorrect information in file: ‘./mysql/servers.frm‘ Running mysql_install_db under strace… –skip-grant-tables and insert a few rows into an InnoDB table, but trying to run a simple mysqlslap just hung…

Post: How to recover table structure from InnoDB dictionary

… about the table structure in an InnoDB page. Normally we either recover the structure from .frm files or take it from some… .frm files over taken from backups. But in some cases even .frm files is not an option: Table was dropped and innodb_file_per_table is ON Frm file corrupt, zeroed…

Post: Understanding the maximum number of columns in a MySQL table

… limit is, we must delve further into the FRM file. What is an FRM file? It’s the FoRM file from UNIREG… can create. If you try setting the storage engine to InnoDB however, you will get an error message! The exact error… of 1,000 columns. This is the code from ha_innodb.cc that enforces that limit: if (form->s->fields > 1000…

Comment: How to recover table structure from InnoDB dictionary

1) innodb_file_per_table видимо по умолчанию, ибо в my.ini … 3) да, база в ibdata1 Поиски пути восстановления без наличия frm файлов не дали никаких результатов. Можете хотя бы подсказать начало…

Post: Recovering CREATE TABLE statement from .frm file

… to recover CREATE TABLE from .frm file ? Recovering from .frm for Innodb Table If we simply copy .frm file back to the database we… test_innodb(i int) engine=innodb; Query OK, 0 rows affected (0.06 sec) mysql> Aborted [root@test3 test]# cp /tmp/test_innodb.frm . cp: overwrite `./test_innodb.frm

Post: InnoDB Full-text Search in MySQL 5.6 (part 1)

… “new” InnoDB tablespace files in our database directory: -rw-rw—-. 1 mysql mysql 8632 Feb 20 15:54 dir_test_innodb.frm -rw-rw—-. 1 mysql mysql 213909504 Feb 20 15:55 dir_test_innodb.ibd -rw-rw—-. 1… 16:09 seo_test_innodb.frm -rw-rw—-. 1 mysql mysql 37748736 Feb 20 16:29 seo_test_innodb.ibd By comparison, this…

Post: How much space does empty Innodb table take ?

… out files (using Innodb File Per Table) -rw-rw—- 1 mysql mysql 8578 Dec 16 20:33 test_innodb.frm -rw-rw—- 1 mysql mysql 98304 Dec 16 20:33 test_innodb.ibd So we get… Dec 16 20:58 test_innodb.frm -rw-rw—- 1 mysql mysql 9437184 Dec 16 21:06 test_innodb.ibd If you do…

Post: Innodb vs MySQL index counts

… an Innodb table make a copy of the .frm file do an ALTER TABLE to add an index then copy the old .frmInnodb could be removed by doing: ALTER TABLE table_name ENGINE=Innodb; This, of course, rebuilds the whole table based on the .frm table definition and removes the existing index in Innodb, which…

Post: MySQL opening .frm even when table is in table definition cache

…] close(32) = 0 <0.000012> [pid 19876] open(“./db/t2.frm“, O_RDONLY) = 32 <0.000014> [pid 19876] read(32, “”…, 10…] close(32) = 0 <0.000012> [pid 19876] open(“./db/t3.frm“, O_RDONLY) = 32 <0.000014> [pid 19876] read(32, “”…, 10… twice – in InnoDB itself and in the table_definition_cache). Further reading: MySQL Forge Internals document on the FRM file format Stewart…

Post: Add an option to Fail on Innodb Initialize failure, Please ?

… MySQL does not stop if Innodb storage engine failed to initialize but starts properly… just having Innodb tables unavailable. I honestly do… accessing Innodb tables is also very obfuscated: error : Incorrect information in file: ‘./prod/user.frm‘ How this supposed to tell you Innodb (or for that sake any other Storage Engine) failed to initialize ? This error suppose to mean .frm file is…