MySQL/InnoDB – ‘Unable to lock’ issue

Root# tail  -f /var/log/mysqld.log

nnoDB: Unable to lock /path/to/ibdata1, error: 11

InnoDB: Check that you do not already have another mysqld process

InnoDB: using the same InnoDB data or log files.

 

Do the following steps

  1. kill the lingering mysql process
  2. Go to /var/lib/mysql
  3. mv (move) ibdata1 file to ibdata1.bad
  4. cp -a ibdata1.bad ibdata1
  5. restart the db server

The mysql instance started a crash recovery and in the end all was good again.  On the error log, here’s what I saw (recovery messages):

100825 16:58:37  InnoDB: Database was not shut down normally!
InnoDB: Starting crash recovery.
InnoDB: Reading tablespace information from the .ibd files...
InnoDB: Restoring possible half-written data pages from the doublewrite
InnoDB: buffer...
100825 16:58:40  InnoDB: Starting log scan based on checkpoint at
InnoDB: log sequence number 8 2737988291.
InnoDB: Doing recovery: scanned up to log sequence number 8 2738024293
100825 16:58:48  InnoDB: Starting an apply batch of log records to the database...
InnoDB: Progress in percents: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99
InnoDB: Apply batch completed
InnoDB: In a MySQL replication slave the last master binlog file
InnoDB: position 0 182, file name log-bin.000039
100825 16:59:12  InnoDB: Started; log sequence number 8 2738024293
 
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