CLI reference¶

Every ./shard-db <cmd> subcommand in one place. Shortcuts for the common operations — for full expressiveness see the Query protocol.

All data-plane commands (anything besides start/stop/status/server) talk to the running server over TCP at $PORT. Start the server first.

Looking for a TUI? shard-cli is a separate ncurses binary built alongside shard-db — full menu-driven access to every JSON mode (browse / query / schema / maintenance / auth / stats), no JSON typing required.

Lifecycle¶

Command	Args	Description
`start`	—	Start the server in the background. Reads `PORT`, `DB_ROOT`, etc. from `db.env`. Writes a pidfile.
`server`	—	Start in the foreground (no fork). Useful for systemd `Type=simple` or debugging.
`stop`	—	Graceful shutdown. Refuses new connections, waits up to 30 s for in-flight writes to drain.
`status`	—	Print `running (pid=..., port=...)` or `stopped`. Exit code reflects status.

CRUD¶

Command	Args	Description
`insert`	`<dir> <obj> <key> '<json_value>'`	Insert (or overwrite) a record. Set `if_not_exists` via JSON mode.
`get`	`<dir> <obj> <key>`	Retrieve a single record.
`delete`	`<dir> <obj> <key>`	Delete a record by key.
`exists`	`<dir> <obj> <key>`	Returns `{"exists":true/false}`.
`size`	`<dir> <obj>`	Active record count; also returns tombstoned count when > 0.

Query¶

Command	Args	Description
`find`	`<dir> <obj> '<criteria_json>' [offset] [limit] [fields]`	Search records. For `join`, `order_by`, `format`, etc. use JSON mode.
`count`	`<dir> <obj> [criteria_json]`	Count matching records. Omit criteria for the O(1) metadata count.
`aggregate`	`<dir> <obj> '<aggregates_json>' [group_by_csv] [criteria_json] [having_json]`	Group + aggregate. `group_by` is a comma-separated field list; leave intermediate slots empty (`''`) to skip them.
`keys`	`<dir> <obj> [offset] [limit]`	List keys, paginated.
`fetch`	`<dir> <obj> [offset] [limit] [fields]`	Paginated full scan with optional field projection. Use JSON mode for keyset `cursor` pagination.

Bulk¶

Command	Args	Description
`bulk-insert`	`<dir> <obj> [file]`	JSON array of `{"id":"<key>","data":{...}}` objects. File path or stdin.
`bulk-delete`	`<dir> <obj> [file]`	JSON array of keys (e.g. `["k1","k2"]`). For criteria-based deletes, use JSON mode.

File storage¶

Command	Args	Description
`put-file`	`<dir> <obj> <local-path> [--if-not-exists]`	Upload local file to server (base64 over TCP). `--if-not-exists` refuses overwrite.
`get-file`	`<dir> <obj> <filename> [<out-path>]`	Download by filename (base64 over TCP). Writes to `<out-path>` or stdout.
`delete-file`	`<dir> <obj> <filename>`	Remove a stored file. Returns `{"status":"deleted",...}` or `{"error":"file not found",...}`.

Size bounded by MAX_REQUEST_SIZE (default 32 MB ⇒ ~24 MB effective file). For same-host admin tasks, JSON mode put-file with path and get-file-path skip the base64 roundtrip.

Index management¶

Command	Args	Description
`add-index`	`<dir> <obj> <field> [-f]`	Build a B+ tree index on a single field. `-f` forces rebuild. Composite via `field1+field2`. Batch builds via JSON mode.
`remove-index`	`<dir> <obj> <field>`	Drop the index (exact name match, including composites). Safe on non-existent index.

Maintenance¶

Command	Args	Description
`vacuum`	`<dir> <obj>`	Fast in-place tombstone reclaim (no schema changes). For compact/reshard, use JSON mode.
`recount`	`<dir> <obj>`	Rescans shards and rewrites the cached `counts` file.
`truncate`	`<dir> <obj>`	Delete all records. Schema + indexes survive.
`backup`	`<dir> <obj>`	Copy the object's data + metadata + indexes to a timestamped backup directory.

Diagnostics¶

Command	Args	Description
`stats`	—	Global snapshot: uptime, active connections, in-flight writes, cache hit rates, recent slow queries. Prints as table.
`stats-prom`	—	Same counters as `stats`, rendered as Prometheus text-format exposition. Wire to your scrape pipeline.
`shard-stats`	`[dir] [obj]`	Per-shard load table. Without args, shows all objects; with one arg, all objects in that dir; with both, just that object.
`db-dirs`	—	List registered tenant directories (from `dirs.conf`).
`vacuum-check`	—	List objects where tombstoned ≥ 10 % AND live ≥ 1000. Suggests candidates for `vacuum`.
`reindex`	`[dir] [obj]`	Rebuild indexes — wipes per-field idx directories and rebuilds at the current `splits/4` shard count. No args = all tenants.

JSON query mode¶

For anything not covered by the shortcut commands (multi-get, aggregates, joins, CAS, schema mutations, bulk-update, file-path variants, etc.):

./shard-db query '<json>'

See Query protocol for every mode and its parameters.

Exit codes¶

Code	Meaning
`0`	Success.
`1`	Error — usage problem, connection failure, or server returned `{"error":...}`.

Error responses are printed verbatim to stdout as JSON, so you can pipe into jq or parse in scripts.

Examples¶

# Multi-get via JSON mode
./shard-db query '{"mode":"get","dir":"default","object":"users","keys":["u1","u2","u3"]}'

# Aggregate (count by status)
./shard-db query '{
  "mode":"aggregate","dir":"default","object":"orders",
  "group_by":["status"],
  "aggregates":[{"fn":"count","alias":"n"}]
}'

# CAS update
./shard-db query '{
  "mode":"update","dir":"default","object":"orders","key":"o1",
  "value":{"status":"paid"},
  "if":[{"field":"status","op":"eq","value":"pending"}]
}'

# Dry-run bulk delete
./shard-db query '{
  "mode":"bulk-delete","dir":"default","object":"orders",
  "criteria":[{"field":"status","op":"eq","value":"cancelled"}],
  "dry_run":true
}'