How to fix EXECABORT Transaction discarded due to previous errors in Redis

Review each command in your MULTI/EXEC block for syntax errors. Check that:
- Command names are spelled correctly
- Argument counts match the command specification
- Data types are appropriate for the operation

Example of invalid command:

MULTI
INCRBY mykey  # Missing argument - causes EXECABORT
EXEC

Before wrapping commands in a transaction, run each command individually in redis-cli to ensure they work:

INCRBY mykey 1
SET mystring "value"
LPUSH mylist item

If any command fails, fix it before adding to a MULTI/EXEC block.

Ensure you're passing the correct number of arguments. Use redis-cli HELP to verify:

127.0.0.1:6379> COMMAND INFO INCRBY

Common mistakes:
- INCRBY requires 2 arguments: key and increment
- SETEX requires 3 arguments: key, seconds, value
- LPUSH requires at least 2 arguments: key and value(s)

If using WATCH, monitor for modifications:

WATCH mykey
MULTI
SET mykey newvalue
EXEC  # Returns null if mykey was modified

If EXEC returns null, retry the transaction with exponential backoff.

Use redis-cli monitor to observe commands in real-time:

redis-cli monitor

This shows all commands received by Redis and helps identify malformed requests.

If syntax is correct but EXECABORT still occurs, verify Redis server resources:

INFO memory

If used_memory is near maxmemory, free up space by deleting unnecessary keys or increasing Redis memory limits.