cambios: 2024-12-01 17:11:13
46
.obsidian/workspace.json
vendored
@@ -4,21 +4,19 @@
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"state": {
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"type": "markdown",
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"type": "image",
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"state": {
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"file": "TERCERO/ATR1/Teoría_2425.md",
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"mode": "source",
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"file": "TERCERO/SS/images/Pasted image 20241125141142.png"
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},
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"icon": "lucide-file",
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"title": "Teoría_2425"
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@@ -77,8 +75,7 @@
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}
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],
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"direction": "horizontal",
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"width": 300,
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"collapsed": true
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"width": 300
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"right": {
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"id": "44cf06183e1c1c7d",
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@@ -175,33 +172,32 @@
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"obsidian-git:Open Git source control": false
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}
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"SEGUNDO/IISSI1/Teoría_2324.md",
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"TERCERO/ATR1/Teoría_2425.md",
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"TERCERO/SS/SS 24-25.md",
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"TERCERO/SPD/Teoría_2425.md",
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"Untitled.md",
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"TERCERO/ATR1/Resolución 1 Parcial ATR1.md",
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"TERCERO/ATR1/Teoría_2425.md",
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"TERCERO/ATR1/Ejercicios.md",
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"conflict-files-obsidian-git.md",
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"TERCERO/IA/Teoría_2425.md",
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"TERCERO/SPD/P4_SPD.md",
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"TERCERO/SS/SS Lab.md",
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"SEGUNDO/ADDA/Teoría_2324.md",
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"TERCERO/IA/Apuntes Julia.md",
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"SEGUNDO/IISSI2/Teoría_2324.md",
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"SEGUNDO/IISSI1/Teoría_2324.md",
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"TERCERO/SS/images",
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"TERCERO/SPD/images",
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"TERCERO/IA/images",
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@@ -819,7 +819,7 @@ Las instrucciones en un bloque `BEGIN-END` están separadas por un delimitador d
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## 12.1. Concepto de transacción
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Una transacción es una secuencia de operaciones DML que se comporta como una unidad lógica de trabajo. Los puntos de sincronismo (synchronization points) definen el estado de la transacción: `START TRANSACTION`, `COMMIT`, `ROLLBACK`.
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Las transacciones deben cumplir las características ACID (Atomicity Consistency Isolation Durability).
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- **Atomicity:** si se confirman (`COMMIT`), se ejecutan todas, si no (`ROLLBACK`), no se ejecuta ninguna.
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- **Atomicity:** si se confirman (`COMMIT`), se ejecutan todas, si no (`ROLLBACK`), no se ejecuta ninguna.
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- **Consistency:** A partir de un estado consistente $S_0$ se deja la BDD en otro estado consistente $S_1$.
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- **Isolation:** se realiza como si fuera la única transacción.
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- **Durability:** Si se confirma, los cambios se hacen persistentes y si se cancela, el estado debe ser el inicial.
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