Mundarija.

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1. Software / Hardware upgrading

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2.1 Database: Race condition

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2.1.1 Database: Race condition: Lock for update

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2.2.1 Database: Slow queries: Indexing

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2.2.2 Database: Slow queries: DB Replication

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2.2.3. Database: Slow queries: Object-Caching

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3.1.1. Caching: Too many connections: Pools

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3.2. Caching: Slow queries: Redis clusters

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4.1. Server: Slow requests

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4.1.1. Server: Slow requests: PHP opcache

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4.1.1. Server: Slow requests: PHP JIT

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4.1.1. Server: Slow requests: PHP JIT

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4.2.1. Server: Too many connections: Asynchronous PHP / Openswoole

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4.2.1. Server: Too many connections: Asynchronous PHP / Openswoole

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4.2.1. Server: Too many connections: Asynchronous PHP / Openswoole

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