load

sqlload load [SELECTOR ...] [OPTIONS]

sqlload load loads the selected tables, creating any that don’t exist yet. It prints the plan first, then a line per table. It takes the same options as plan.

Loading

$ sqlload load
…
loaded   raw.app__customers  50 rows  0.0s
loaded   raw.app__orders     1,000 rows  0.0s

✓ Completed  2 loaded, 1,050 rows, 0.1s

Each table prints created, altered, loaded or failed. A failed table doesn’t stop the others; the summary counts them and the command exits 1.

Large loads commit along the way, so a failure keeps what committed and the next run carries on from there; a delete_insert into ClickHouse read by cursor publishes once per run instead. See Batches. To read a range instead of continuing from the destination’s maximum, give --start-cursor and --end-cursor; see Backfilling a range.

Reloading

--reload rebuilds tables from scratch. On a terminal it shows the plan and asks; in scripts, add --yes:

$ sqlload load --reload --yes app__customers
…
loaded   raw.app__customers  50 rows  0.0s

✓ Completed  1 loaded, 50 rows, 0.1s

A postgres_cdc table is copied again with --resnapshot instead; --reload refuses it. See Reloading. --reload is also refused on Postgres targets.

Following a Postgres CDC source

sqlload load SOURCE --follow keeps streaming one postgres_cdc source after it catches up, writing a batch every batch_interval, until --max-duration passes or it gets Ctrl-C or SIGTERM. A second Ctrl-C or SIGTERM stops it at once, with exit code 130. See Keep streaming.

sqlload load app --follow --max-duration 10m

Results as JSON

From 0.27.0, apply --json and load --json print one JSON document on standard output when they finish, for scripts and orchestrators. Logs stay on standard error. The exit code is the same as without --json.

$ sqlload load --json
{
  "schema_version": 1,
  "command": "load",
  "ok": false,
  "retryable": true,
  "started_at": "2026-11-08T16:33:56.655Z",
  "finished_at": "2026-11-08T16:33:56.731Z",
  "duration_seconds": 0.076,
  "summary": {
    "created": 1,
    "altered": 0,
    "recreated": 0,
    "loaded": 1,
    "failed": 1,
    "rows": 1200
  },
  "plan": { "ok": true, "summary": "2 selected, 2 objects to create, 2 to load", … },
  "objects": [
    { "action": "created", "name": "raw.shop__orders", "detail": "4 columns" }
  ],
  "tables": [
    {
      "table": "raw.shop__orders",
      "source": "shop",
      "target": "dev",
      "write_strategy": "replace",
      "status": "loaded",
      "rows": 1200,
      "duration_seconds": 0.032,
      "note": null,
      "error": null,
      "retryable": false
    },
    {
      "table": "raw.shop__refunds",
      "source": "shop",
      "target": "dev",
      "write_strategy": "replace",
      "status": "failed",
      "rows": null,
      "duration_seconds": 0.009,
      "note": null,
      "error": "GET http://api.example.com/v1/refunds?page=3: HTTP 503: unavailable (after 4 attempts)",
      "retryable": true
    }
  ]
}

Field	Meaning
schema_version	1. New fields can appear without a change; it changes only when a field changes meaning or goes away.
command	apply or load.
ok	Whether every selected table planned and loaded: true exactly when the exit code is 0.
retryable	From 0.34.0 (not released yet). Whether running the command again unchanged may fix every failure: true exactly when the exit code is 75. It’s false when ok is true, whenever a table failed for good, and whenever a plan error other than an unreachable source left one out. See Retrying failed runs.
summary	How many objects were created, altered (each table once, however many changes it had) and recreated; tables loaded and failed; rows loaded.
plan	The same document plan --json prints, with its own ok and, from 0.34.0 (not released yet), retryable. Tables a plan error left out are in its errors, and tables with nothing to load in skipped.
objects	One entry per change to a table or stage, by apply or during a load: its action (created, altered or recreated), its name and the detail. A table that gains two columns has two altered entries.
tables	Each table loaded: its status (loaded or failed), rows, duration_seconds, a note (the cursor window it read, or that its table waits for first data), and the error when it failed. From 0.34.0 (not released yet), retryable says whether that failure may pass on a rerun. source, target and write_strategy are null only for a load --follow that failed before any table. apply loads nothing, so its list is empty.

When the run can’t start (the configuration doesn’t parse, a connection fails), standard output holds one error document instead, the same as plan --json’s: {"error": {"code": "config", "message": "…", "help": "…", "retryable": false}}. code is config for the configuration, else the command’s name. From 0.34.0 (not released yet), retryable is true, and the exit code 75, when the run couldn’t start for a reason a rerun may fix, such as a target that refused the connection or timed out.

--reload and --resnapshot need --yes with --json, as there is no prompt to answer.

Under --json, what a Python source prints goes to standard error, so standard output holds only the document. Output written to the process’s standard output directly, such as by a child process that inherits it or os.write(1, …), still reaches standard output: capture or redirect it in the source.