Databases
“MySQL server has gone away” sounds like the database stopped entirely. Sometimes it did. Sometimes the application simply tried to reuse an expired c...
The site works for a while, then requests start failing with SQLSTATE[HY000] [1040] Too many connections. Raising max_connections is an easy suggestio...
A query that appears stuck may be waiting for a lock held by another transaction. Finding the blocker is safer than cancelling sessions at random, bec...
A query can be slow because it reads too many rows, repeats an operation many times or waits on work outside the part you measured. EXPLAIN ANALYZE he...
A successful import message does not establish that the backup contains everything the application needs. The wrong database may have been selected, s...
During an SQL import, ERROR 1062: Duplicate entry means a PRIMARY or UNIQUE key would be violated. It does not necessarily mean the same row appears t...
If a name such as “Çağrı” appears as garbled symbols, do not immediately run ALTER TABLE across the database. The value may have been stored incorrect...
An SQL dump that stops with Unknown collation: 'utf8mb4_0900_ai_ci' is not necessarily damaged. The destination may not recognize the comparison rule ...
You select an SQL backup, start the import, and receive a blank page or timeout several minutes later. Retrying immediately is tempting. However, the ...
Indexes are crucial components in SQL databases that significantly improve data access speed. Proper index usage leads to faster queries and greatly e...
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