add better index for finding unindexed paths

for the following query 'SELECT "path" FROM "oc_filecache" WHERE ("storage" = $storage) AND ("size" < 0) ORDER BY "fileid" DESC LIMIT 1;'

currently the database will in some cases decide to priorize the sort by fileid over the filter when picking what index to use, resulting in a much slower query.

by creating an index that allows first sorting by fileid and also filter by storage and size this case will be greatly sped up

Signed-off-by: Robin Appelman <robin@icewind.nl>

1 files changed, 1 insertions, 0 deletions

diff --git a/core/Migrations/Version13000Date20170718121200.php b/core/Migrations/Version13000Date20170718121200.php
index 7b959c6073c..e8dbf1fc0fb 100644
--- a/core/Migrations/Version13000Date20170718121200.php
+++ b/core/Migrations/Version13000Date20170718121200.php
@@ -261,6 +261,7 @@ class Version13000Date20170718121200 extends SimpleMigrationStep {
 			$table->addIndex(['storage', 'mimetype'], 'fs_storage_mimetype');
 			$table->addIndex(['storage', 'mimepart'], 'fs_storage_mimepart');
 			$table->addIndex(['storage', 'size', 'fileid'], 'fs_storage_size');
+			$table->addIndex(['fileid', 'storage', 'size'], 'fs_id_storage_size');
 			$table->addIndex(['mtime'], 'fs_mtime');
 			$table->addIndex(['size'], 'fs_size');
 		}