# error: database/sql: connection pool exhausted: too many connections

- **ID:** `go/database-sql-connection-pool-exhausted`
- **Domain:** go
- **Category:** resource_error
- **Verification:** ai_generated
- **Fix Rate:** 80%

## Root Cause

数据库连接池中的连接数量达到上限，无法创建新连接。

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| 1.18 | active | — | — |

## Workarounds

1. **** (90% success)
   ```
   db.SetMaxOpenConns(100)
db.SetMaxIdleConns(50)
db.SetConnMaxLifetime(time.Hour)
   ```
2. **** (95% success)
   ```
   defer rows.Close()
defer stmt.Close()
defer db.Close()
   ```

## Dead Ends

- **** — 可能超出数据库服务器最大连接数，导致服务器崩溃。 (70% fail)
- **** — 只是临时解决，问题会再次出现。 (50% fail)