PTTL

Returns the expiration time in milliseconds of a key.

Browse all commands · Upstream source documentation

Reference field	Value
Canonical name	PTTL
Catalog group	Generic commands
Upstream since	2.6.0 — upstream Redis/module version, not an ffkv release
Pinned catalog	Redis 8.10.0

Syntax

PTTL key

ffkv behavior and limits

TTL deadlines use wall-clock time and remain absolute across restart. Key/database operations can overwrite or remove data; SCAN is incremental rather than an atomic snapshot. New typed structures remain in RAM in hybrid mode.

Source: README.md:193–195, 375–377, 584–585; tests/bdd/features/generic.feature.

All requests share the 8 MiB framing/1,024-argument ingress limit; normal RESP replies have 64 MiB wire/logical budgets with bounded nesting/value counts. Management and Lua origins impose smaller budgets. These are not a process RSS cap. Catalog inclusion is not exhaustive option or wire-format parity. See limits and compatibility.

Upstream metadata

The following fields come from the pinned Redis metadata, not measured ffkv performance or an assertion that ffkv enforces every upstream flag. Running COMMAND INFO/COMMAND DOCS describe the current engine.

Upstream Redis complexity: O(1)

Upstream arity: 2 (includes the command name; a negative number is a minimum).

Command flags: READONLY, FAST.

ACL categories: KEYSPACE.

Command tips: NONDETERMINISTIC_OUTPUT.

Argument structure

Argument	Type	Constraints / metadata
key	key	key_spec_index: 0

Key specifications

Upstream key discovery descriptors (indexes are relative to the full command vector):

[
  {
    "flags": [
      "RO",
      "ACCESS"
    ],
    "begin_search": {
      "index": {
        "pos": 1
      }
    },
    "find_keys": {
      "range": {
        "lastkey": 0,
        "step": 1,
        "limit": 0
      }
    }
  }
]

Additional pinned upstream metadata

{
  "group": "generic",
  "since": "2.6.0",
  "history": [
    [
      "2.8.0",
      "Added the -2 reply."
    ]
  ]
}

Metadata source · Local snapshot: src/command_metadata.json, key pttl.

BDD coverage and source examples

These are source observations, not a test run performed by this documentation build. A tag identifies scenario intent; an extracted vector identifies a command invocation, which may intentionally produce an error. Scenarios may require setup, multiple connections, persistence, cluster nodes or native-module fixtures.

• Swapping logical databases preserves values TTLs and recovery — tests/bdd/features/catalog.feature:170; invocation observed.
• Live resolved mutations replay list changes deletion and absolute expiry exactly once — tests/bdd/features/cluster.feature:1109; invocation observed.
• Dump and restore round trip binary values without copying the source key deadline — tests/bdd/features/generic.feature:182; invocation observed.
• Millisecond expiration conditions preserve live data until an immediate deadline — tests/bdd/features/generic.feature:515; command tag and invocation observed.
• Sort resolves external hash weights and multiple GET patterns before limiting and storing — tests/bdd/features/generic.feature:1203; invocation observed.
• Prepared layouts preserve declared field order and replace complete hashes — tests/bdd/features/hashes.feature:877; invocation observed.
• Bounded increments reject without changing expiration then saturate — tests/bdd/features/strings.feature:344; invocation observed.
• Read and delete removes both value and expiration — tests/bdd/features/strings.feature:413; invocation observed.
• Getex preserves or changes expiration without changing bytes — tests/bdd/features/strings.feature:442; invocation observed.
• Getset returns previous bytes and discards expiration — tests/bdd/features/strings.feature:535; invocation observed.

Extracted command vectors

The following JSON arrays are the test harness’s argument vectors, not shell commands. Numeric arguments are converted by the harness; objects of the form {"base64":"…"} represent decoded binary bytes, not a literal JSON command argument. Preserve scenario setup and connection ordering. See the CLI guide for shell quoting and binary stdin. No reply is invented or inferred.

Swapping logical databases preserves values TTLs and recovery — tests/bdd/features/catalog.feature:184 (I execute:)

[
  "PTTL",
  "key"
]

Next source assertion: the reply is between 1 and 60000

Prepared layouts preserve declared field order and replace complete hashes — tests/bdd/features/hashes.feature:900 (I execute:)

[
  "PTTL",
  "user"
]

Next source assertion: the reply equals:

-1

Read and delete removes both value and expiration — tests/bdd/features/strings.feature:432 (I execute:)

[
  "PTTL",
  "item"
]

Next source assertion: the reply equals:

-2