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increase hit ratio on these memcache keys and get rid of most of ` SHOW SLAVE STATUS` queries (10% of all that hit shared DB).\r\n\r\n```sql\r\nsite> select bucket, key, sum from Mediawiki_App_Memcache_Keys_Stats_60m where time > now() - 2h and key =~ /lag_times/ and bucket =~ /miss|hit/\r\n┌─────────────────┬─────────────────┬────────┬────────────────────────────────┬───────┐\r\n│       time      │ sequence_number │ bucket │ key                            │ sum   │\r\n├─────────────────┼─────────────────┼────────┼────────────────────────────────┼───────┤\r\n│ 6/3/15 11:00:00 │ 48              │ miss   │ *:*:lag_times:statsdb-s9       │ 413   │\r\n│ 6/3/15 11:00:00 │ 47              │ hit    │ *:*:lag_times:statsdb-s9       │ 334   │\r\n│ 6/3/15 11:00:00 │ 45              │ miss   │ *:*:lag_times:sharedb-s3       │ 7427  │\r\n│ 6/3/15 11:00:00 │ 44              │ hit    │ *:*:lag_times:sharedb-s3       │ 22812 │\r\n└─────────────────┴─────────────────┴────────┴────────────────────────────────┴───────┘\r\nQuery took  1603 ms\r\n```\r\n\r\n@wladekb / @michalroszka / @drozdo 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