Index with compound keys - can you use part of the key?

For something like

export default defineSchema({
  messages: defineTable({
    channel: v.id("channels"),
    body: v.string(),
    user: v.id("users"),
  })
    .index("by_channel", ["channel"])
    .index("by_channel_user", ["channel", "user"]),
});

export default defineSchema({
  messages: defineTable({
    channel: v.id("channels"),
    body: v.string(),
    user: v.id("users"),
  })
    .index("by_channel", ["channel"])
    .index("by_channel_user", ["channel", "user"]),
});

Does that by_channel need to exist? Can we not use just the channel first key of the by_channel_user index?

3 Replies

Convex Bot•3w ago

Thanks for posting in <#1088161997662724167>. Reminder: If you have a Convex Pro account, use the Convex Dashboard to file support tickets. - Provide context: What are you trying to achieve, what is the end-user interaction, what are you seeing? (full error message, command output, etc.) - Use search.convex.dev to search Docs, Stack, and Discord all at once. - Additionally, you can post your questions in the Convex Community's <#1228095053885476985> channel to receive a response from AI. - Avoid tagging staff unless specifically instructed. Thank you!

DanTheGoodmanOP•3w ago

it appears you can

erquhart•2w ago

Yep, this is actually a best practice: https://docs.convex.dev/understanding/best-practices/#check-for-redundant-indexes

Index with compound keys - can you use part of the key?

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