All Errors

PostgreSQL collation errors occur when you reference a collation that is not available on your system. This typically happens after OS upgrades, during database migrations, or when using locale settings that are not installed. Check available collations and install missing locales to resolve the issue.

This error occurs when a Redis command is called with the wrong number of parameters. The GET command requires exactly one argument (the key), but received a different number. Verify your command syntax and the correct argument count for the specific command.

This error occurs when PostgreSQL's parser reaches the end of a statement unexpectedly. It typically indicates incomplete SQL syntax, missing parentheses, unclosed quotes, or incorrect parameter placeholders.

The "initdb: directory exists but is not empty" error occurs when trying to initialize a new PostgreSQL database cluster while the data directory already contains files. This is a safety feature to prevent accidental data loss. The error can be fixed by using an empty directory, removing existing files, or specifying a different initialization directory.

PostgreSQL connection refused error occurs when a client cannot establish a connection to the database server. This typically happens when the server is not running, not listening on the expected port, or has firewall/network restrictions.

The BUSYKEY error occurs when trying to use the RESTORE command to restore a key that already exists in your Redis database without using the REPLACE option. This prevents accidental data overwrites.

PostgreSQL "Connection refused" error occurs when the client cannot establish a TCP connection to the server, typically because the PostgreSQL service is not running, not listening on the expected port, or network/firewall restrictions block the connection. Common fixes include starting the PostgreSQL service, verifying listen_addresses configuration, and checking firewall rules.

This PostgreSQL error (ERROR 23505) occurs when an INSERT or UPDATE operation tries to add a value that already exists in a column with a unique constraint or primary key. Common causes include out-of-sync sequences, duplicate data, or concurrent inserts. Fixing requires identifying the constraint, checking for existing duplicates, or using INSERT...ON CONFLICT.

This error occurs when you attempt to connect to a PostgreSQL database that doesn't exist on the server. It commonly happens when psql tries to connect to a database with the same name as your OS user account, or when you specify an incorrect database name in your connection string.

PostgreSQL connection failure occurs when a client cannot establish a connection to the database server. This can happen due to the server being down, incorrect connection parameters, network issues, or authentication problems.

Connection refused errors occur when your application cannot establish a TCP connection to the Redis server. This typically means Redis isn't running, is listening on a different port, or network/firewall rules are blocking the connection.

The "ERR max number of clients reached" error occurs when the number of active client connections exceeds Redis's configured maxclients limit (default 10,000). Common causes include connection leaks, insufficient connection pooling, and undersized Redis instances. Fix by using connection pooling, increasing maxclients, upgrading your Redis instance, or reducing connection usage.

The Redis error "ERR value is not an integer or out of range" occurs when integer operations (INCR, DECR, INCRBY, HINCRBY, etc.) receive invalid values. This happens when the stored value is not a valid integer, exceeds 64-bit signed integer limits, or is a floating-point number. Fixing requires storing valid integers, using INCRBYFLOAT for decimals, or validating input before operations.

MySQL Error 1064 (ER_PARSE_ERROR) occurs when the database parser encounters invalid SQL syntax. Common causes include misspelled keywords, unescaped reserved words, mismatched quotes or parentheses, missing data values, and outdated syntax. Fixing requires careful review of the query, using backticks for reserved words, and validating syntax with tools.

PostgreSQL terminates connections unexpectedly due to server crashes, network timeouts, or configuration issues. Fix by checking server logs, enabling TCP keepalives, and verifying network stability.

PostgreSQL reaches its maximum allowed connections and reserves the remaining slots for superusers only. Regular applications cannot connect and receive this error when all available non-reserved connection slots are in use. This typically occurs due to application connection leaks, insufficient max_connections setting, or high traffic without proper connection pooling.

The "ERR timeout reading from client" error occurs when Redis cannot read a command or response from a client within the configured timeout period. This commonly happens with long-running Lua scripts, slow commands, network issues, or misconfigured timeouts. Fixing requires optimizing scripts, adjusting timeout values, and investigating network conditions.

This error occurs when a Redis command is executed on a key that holds a different data type than expected. Redis enforces strict type checking—using LPUSH on a string key or HGETALL on a list will fail. Fix by checking the key type with TYPE, using the correct command for that type, or deleting and recreating the key with the proper data type.

The 'FATAL: the database system is in recovery mode' error occurs when PostgreSQL is recovering from an unexpected shutdown, crash, or operating as a read-only standby/replica server. This typically happens after server restarts, crashes, or during replication scenarios.

This error occurs when PostgreSQL cannot find a table, view, or other relation with the specified name. It's usually caused by schema issues, case sensitivity problems, typos, or incorrect database connections. Fix by verifying the table exists, checking exact naming and case, specifying the correct schema, or adjusting search_path settings.