quay/data/migrations/versions/228d1af6af1c_mysql_max_index_lengths.py

"""mysql max index lengths

Revision ID: 228d1af6af1c
Revises: 5b84373e5db
Create Date: 2015-01-06 14:35:24.651424

"""

# revision identifiers, used by Alembic.
revision = '228d1af6af1c'
down_revision = '5b84373e5db'

from alembic import op
import sqlalchemy as sa
from sqlalchemy.dialects import mysql

def upgrade(tables):
  op.drop_index('queueitem_queue_name', table_name='queueitem')
  op.create_index('queueitem_queue_name', 'queueitem', ['queue_name'], unique=False, mysql_length=767)

  op.drop_index('image_ancestors', table_name='image')
  op.create_index('image_ancestors', 'image', ['ancestors'], unique=False, mysql_length=767)

def downgrade(tables):
  pass
Explicitly declare length of large MySQL indices. Most MySQL installs silently truncate indices at a specific number of bytes. This value is 767 bytes unless either the innodb_large_prefix option is turned on or the innodb_page_size has been changed. This change explicitly limits the size of large indices to 767 characters due to the latin1 charset being 1 byte per char. 2015-01-06 19:55:31 +00:00			`"""mysql max index lengths`

			`Revision ID: 228d1af6af1c`
			`Revises: 5b84373e5db`
			`Create Date: 2015-01-06 14:35:24.651424`

			`"""`

			`# revision identifiers, used by Alembic.`
			`revision = '228d1af6af1c'`
			`down_revision = '5b84373e5db'`

			`from alembic import op`
			`import sqlalchemy as sa`
			`from sqlalchemy.dialects import mysql`

			`def upgrade(tables):`
			`op.drop_index('queueitem_queue_name', table_name='queueitem')`
			`op.create_index('queueitem_queue_name', 'queueitem', ['queue_name'], unique=False, mysql_length=767)`

Continuation of baa4918d89. 2015-01-06 20:11:37 +00:00			`op.drop_index('image_ancestors', table_name='image')`
			`op.create_index('image_ancestors', 'image', ['ancestors'], unique=False, mysql_length=767)`

Explicitly declare length of large MySQL indices. Most MySQL installs silently truncate indices at a specific number of bytes. This value is 767 bytes unless either the innodb_large_prefix option is turned on or the innodb_page_size has been changed. This change explicitly limits the size of large indices to 767 characters due to the latin1 charset being 1 byte per char. 2015-01-06 19:55:31 +00:00			`def downgrade(tables):`
			`pass`