Database Errors

could not open file for writing: Permission denied

Fix PostgreSQL VACUUM FULL Permission Denied Error

VACUUM FULL fails with permission denied because PostgreSQL can't write new table files. Usually a d...

Intermediate 👁 38 Aug 20, 2026

0X8004D01B

XACT_E_TMNOTAVAILABLE Fix: Transaction Manager Not Available

XACT_E_TMNOTAVAILABLE means Windows can't reach the MSDTC service. Usually a firewall rule or servic...

Intermediate 👁 24 Aug 20, 2026

0X00001AB6

Fix Cannot Execute File in Transaction 0x1ab6

A database error limiting file writes inside transactions. Wrap them properly or avoid DDL in transa...

Intermediate 👁 26 Aug 20, 2026

ERROR 1055 (42000)

Fix MySQL 1055: only_full_group_by error in 8.0

MySQL 8.0 rejects SELECTs with non-aggregated columns not in GROUP BY. Fix it by adjusting sql_mode,...

Intermediate 👁 33 Aug 19, 2026

SQLITE_FULL

Fix 'database or disk is full' in SQLite with WAL mode

SQLite throws SQLITE_FULL when disk space runs out, but WAL mode can also trip it on the wrong journ...

Intermediate 👁 63 Aug 19, 2026

1040

MySQL ERROR 1040: Too many connections — fix order that works

MySQL throws 1040 when every connection slot is used. Start by killing idle sessions, then bump max_...

Intermediate 👁 53 Aug 19, 2026

ORA-08177

ORA-08177: Why You're Seeing It and the Fix That Works

ORA-08177 pops up when two transactions try to edit the same rows at once. You'll need to retry or c...

Intermediate 👁 38 Aug 18, 2026

ERROR 1205 (HY000)

MySQL Error 1205: Lock Wait Timeout — 3 Fixes That Work

MySQL throws 1205 when a transaction waits too long for a row lock. Start with the quick retry fix, ...

Intermediate 👁 35 Aug 18, 2026

ERROR 1040 (HY000)

MySQL ERROR 1040 Too many connections — Fix max_connections now

MySQL refuses new connections when you hit the max_connections limit. First raise the limit and then...

Intermediate 👁 30 Aug 18, 2026

23505

Fix Postgres duplicate key pg_type_typname_nsp_index (23505)

Getting 'duplicate key value violates unique constraint pg_type_typname_nsp_index'? Usually it's a b...

Intermediate 👁 42 Aug 16, 2026

0X8004D01A

XACT_E_LOGFULL (0x8004D01A): Log Full in MSDTC

MSDTC log fills up from uncommitted or long-running distributed transactions. Truncate the log, then...

Intermediate 👁 24 Aug 16, 2026

SQLITE_BUSY

Fix SQLite Database Is Locked (SQLITE_BUSY) When Multiple Writers Collide

SQLite throws SQLITE_BUSY when two processes write at once. Start with a timeout, then WAL mode, the...

Intermediate 👁 101 Aug 16, 2026

ER_PUBLIC_KEY_RETRIEVAL_NOT_ALLOWED

MySQL 8.0 public key retrieval is not allowed — the real fix

This error appears when connecting to MySQL 8.0 over non-SSL with a password. The fix: add allowPubl...

Intermediate 👁 22 Aug 16, 2026

0X0000054E

Fix ERROR_INTERNAL_DB_CORRUPTION 0X0000054E: Step-by-Step

Tired of that Windows error? Here's the direct fix—repair the database with chkdsk and DISM, then re...

Intermediate 👁 30 Aug 15, 2026

0XC0190037

Fix STATUS_CANT_BREAK_TRANSACTIONAL_DEPENDENCY (0XC0190037)

SQL Server throws 0XC0190037 when a session tries to break a transactional dependency, often from bo...

Intermediate 👁 21 Aug 14, 2026

0X0004D002

Fix XACT_S_READONLY 0x4D002: Read-Only Transaction Error

XACT_S_READONLY means your transaction tried to write but the database or session is read-only. Star...

Intermediate 👁 44 Aug 13, 2026

ORA-00600

ORA-00600 [4194] Fix: Undo Recovery Without Losing Data

Oracle's ORA-00600 [4194] is an internal error during undo recovery. Here's how to fix it by clearin...

Advanced 👁 43 Aug 12, 2026

0X00001ABD

Fix ERROR_TM_IDENTITY_MISMATCH 0X00001ABD in SQL Server

SQL Server error when a transaction manager identity doesn't match. Usually from linked servers or D...

Intermediate 👁 25 Aug 12, 2026

0X00001A3F

Fix SQL Server ERROR_TRANSACTIONMANAGER_NOT_ONLINE 0x1A3F

SQL Server throws 0X00001A3F when the transaction manager is offline. Usually a service or network h...

Intermediate 👁 33 Aug 12, 2026

0X00001AB1

Fix ERROR_LOG_GROWTH_FAILED 0X00001AB1: Log Space Crisis

SQL Server can't grow its transaction log. Usually a full disk, maxed file size, or runaway transact...

Intermediate 👁 24 Aug 11, 2026

0XC000071D

Fix STATUS_CALLBACK_RETURNED_TRANSACTION (0XC000071D)

This Windows bug check fires when a threadpool worker callback returns while a transaction is still ...

Intermediate 👁 23 Aug 11, 2026

42P01

Postgres 42P01: Relation Does Not Exist After CREATE TABLE

Fix the classic Postgres 'relation does not exist' error that pops up right after creating a table. ...

Intermediate 👁 32 Aug 9, 2026

ERROR 1449 (HY000)

Fix MySQL Error 1449: Definer User Doesn't Exist (3 Causes)

MySQL error 1449 means a view or stored program references a definer user that's missing. Here are t...

Intermediate 👁 36 Aug 9, 2026

2002 (HY000)

MySQL 2002 Socket Error: Quick Fix That Works on Ubuntu & Debian

MySQL won't connect via socket. Likely the service is down or the socket path is wrong. Restart MySQ...

Beginner 👁 26 Aug 8, 2026