PTTL
abbr.phototransferred thermoluminescence Light energy transfer thermoluminescence, light conversion thermoluminescence
redis PTTL command syntax
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 command example
# 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