Database Services for Media & Streaming Platforms

Samples real-time cache hit ratios, memory fragmentation, and key eviction metrics to detect cache thrashing before DRM license issuance degrades.

# 1. Sample real-time cache hit ratio, instantaneous ops, and eviction rate
redis-cli -h $REDIS_PRIMARY -p 6379 INFO stats | awk -F: '
  /keyspace_hits/ {hits=$2}
  /keyspace_misses/ {misses=$2}
  /evicted_keys/ {evicted=$2}
  /instantaneous_ops_per_sec/ {ops=$2}
  END {
    total = hits + misses;
    hit_ratio = (total > 0) ? (hits / total) * 100 : 0;
    printf "Hit Ratio: %.2f%% | Misses: %d | Evicted: %d | Ops/sec: %d\n", hit_ratio, misses, evicted, ops;
  }'

# 2. Check memory fragmentation and connected client buffers non-blockingly
redis-cli -h $REDIS_PRIMARY -p 6379 INFO memory | grep -E 'used_memory_human|used_memory_peak_human|mem_fragmentation_ratio|maxmemory_policy'

# 3. Detect slow commands without locking the single-threaded event loop
redis-cli -h $REDIS_PRIMARY -p 6379 SLOWLOG GET 10

Monitors active client backends, waiting queries, and identifies slow DRM entitlement SQL statements without taking exclusive metadata locks.

-- 1. Inspect active connection states, waiting transactions, and pool saturation
SELECT count(*) AS total_connections,
       count(*) FILTER (WHERE state = 'active') AS active_queries,
       count(*) FILTER (WHERE state = 'idle in transaction') AS idle_in_trx,
       count(*) FILTER (WHERE wait_event IS NOT NULL) AS waiting_queries,
       max(EXTRACT(EPOCH FROM (now() - query_start)))::numeric(10,2) AS max_duration_sec
FROM pg_stat_activity
WHERE backend_type = 'client backend';

-- 2. Isolate DRM entitlement & rights verification queries experiencing lock or I/O waits
SELECT pid,
       usename,
       wait_event_type,
       wait_event,
       state,
       round(EXTRACT(EPOCH FROM (now() - query_start))::numeric, 2) AS duration_seconds,
       LEFT(query, 120) AS query_sample
FROM pg_stat_activity
WHERE state = 'active'
  AND (query ILIKE '%entitlement%' OR query ILIKE '%license%' OR query ILIKE '%playback%')
ORDER BY query_start ASC
LIMIT 10;