RETRY_STRATEGY

Also known as

retry_strategy, retry (with or without @ prefix)

Assign a named retry strategy for handling transient database failures.

Syntax

@retry_strategy <strategy-name>
@retry <strategy-name>

Or using custom parameter syntax:

@retry_strategy = <strategy-name>
@retry = <strategy-name>

The strategy-name must match a strategy defined in CommandRetryOptions configuration.

Examples

Use Default Strategy

comment on function critical_operation() is
'HTTP POST
@retry_strategy default';

Use Named Strategy

comment on function important_query() is
'HTTP GET
@retry aggressive';

Combined with Timeout

comment on function long_running_task() is
'HTTP POST
@timeout 2min
@retry_strategy default';

Behavior

• References a retry strategy defined in CommandRetryOptions.Strategies configuration.
• Automatically retries on transient failures when PostgreSQL returns error codes defined in the strategy.
• Strategy defines:
  • Retry count: Number of elements in RetrySequenceSeconds array
  • Retry delays: Wait time between retries in seconds
  • Error codes: PostgreSQL error codes that trigger retries

Common Retry Scenarios

Error Type	PostgreSQL Codes	Description
Serialization	40001, 40P01	Transaction conflicts, deadlocks
Connection	08000, 08003, 08006	Connection issues
Resources	53300	Too many connections
System	57P03	Cannot connect now

Configuration Example

Define strategies in configuration:

{
  "CommandRetryOptions": {
    "Enabled": true,
    "DefaultStrategy": "default",
    "Strategies": {
      "default": {
        "RetrySequenceSeconds": [0, 1, 2, 5, 10],
        "ErrorCodes": ["40001", "40P01", "08000", "08003", "08006"]
      },
      "aggressive": {
        "RetrySequenceSeconds": [0, 0.5, 1, 2, 5, 10, 30],
        "ErrorCodes": ["40001", "40P01", "08000", "08003", "08006", "53300", "57P03"]
      },
      "minimal": {
        "RetrySequenceSeconds": [0, 1],
        "ErrorCodes": ["40001", "40P01"]
      }
    }
  }
}

Then use in annotations:

-- Use aggressive retry for critical operations
comment on function process_payment() is
'HTTP POST
@retry aggressive';

-- Use minimal retry for fast queries
comment on function quick_lookup() is
'HTTP GET
@retry minimal';

See Command Retry for complete configuration reference.

Related

• Command Retry configuration - Define retry strategies
• Comment Annotations Guide - How annotations work
• Configuration Guide - How configuration works

Related Annotations

• COMMAND_TIMEOUT - Set query timeout
• ERROR_CODE_POLICY - Custom error code handling