redis PTTL command
Translation results：
PTTL
abbr.phototransferred thermoluminescence Light energy transfer thermoluminescence, light conversion thermoluminescence
redis PTTL commandsyntax
Function: This command is similar to the TTL command, but it returns the remaining survival time of the key in milliseconds, not in seconds like the TTL command.
Syntax: PTTL key
Available versions: >= 2.6.0
Time complexity: O(1)
Return: When key does not exist, return -2. When the key exists but the remaining survival time is not set, -1 is returned. Otherwise, returns the remaining lifetime of key in milliseconds.
redis PTTL commandexample
# 不存在的 key redis> FLUSHDB OK redis> PTTL key (integer) -2 # key 存在，但没有设置剩余生存时间 redis> SET key value OK redis> PTTL key (integer) -1 # 有剩余生存时间的 key redis> PEXPIRE key 10086 (integer) 1 redis> PTTL key (integer) 6179