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| -rw-r--r-- | nova/db/sqlalchemy/migrate_repo/versions/178_add_index_to_compute_node_stats.py | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/nova/db/sqlalchemy/migrate_repo/versions/178_add_index_to_compute_node_stats.py b/nova/db/sqlalchemy/migrate_repo/versions/178_add_index_to_compute_node_stats.py new file mode 100644 index 000000000..c6a4d1527 --- /dev/null +++ b/nova/db/sqlalchemy/migrate_repo/versions/178_add_index_to_compute_node_stats.py @@ -0,0 +1,37 @@ +# Copyright 2013 Rackspace Hosting +# All Rights Reserved. +# +# Licensed under the Apache License, Version 2.0 (the "License"); you may +# not use this file except in compliance with the License. You may obtain +# a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT +# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the +# License for the specific language governing permissions and limitations +# under the License. + +from sqlalchemy import Index, MetaData, Table + + +TABLE_NAME = 'compute_node_stats' +IDX_NAME = 'compute_node_stats_node_id_and_deleted_idx' + + +def upgrade(migrate_engine): + """Add an index to make the scheduler lookups of compute_nodes and joined + compute_node_stats more efficient. + """ + meta = MetaData(bind=migrate_engine) + cn_stats = Table(TABLE_NAME, meta, autoload=True) + idx = Index(IDX_NAME, cn_stats.c.compute_node_id, cn_stats.c.deleted) + idx.create(migrate_engine) + + +def downgrade(migrate_engine): + meta = MetaData(bind=migrate_engine) + cn_stats = Table(TABLE_NAME, meta, autoload=True) + idx = Index(IDX_NAME, cn_stats.c.compute_node_id, cn_stats.c.deleted) + idx.drop(migrate_engine) |