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db: Add index covering the output heights

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Avoids performing a table scan, now deletes on blocks are a lot
faster.

Signed-off-by: Christian Decker <decker.christian@gmail.com>
This commit is contained in:
Christian Decker 2018-02-26 12:57:30 +01:00
parent c9985805cd
commit 247aa13a58
1 changed files with 2 additions and 0 deletions
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2
wallet/db.c
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@ -215,6 +215,8 @@ char *dbmigrations[] = {
* die. */
"ALTER TABLE outputs ADD COLUMN confirmation_height INTEGER REFERENCES blocks(height) ON DELETE SET NULL;",
"ALTER TABLE outputs ADD COLUMN spend_height INTEGER REFERENCES blocks(height) ON DELETE SET NULL;",
/* Create a covering index that covers both fields */
"CREATE INDEX output_height_idx ON outputs (confirmation_height, spend_height);",
NULL,
};