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您好!我理解您可能在询问关于 **PostgreSQL(PG)数据库的“slot”** 概念。在PostgreSQL中,**Replication Slot(复制槽)** 是一个非常重要的功能,主要用于**流复制(Streaming Replication)和逻辑解码(Logical Decoding)**。

下面我为您详细解释一下,并提供一个简单的演示示例。

### 一、什么是复制槽?

复制槽的主要作用是**确保主服务器在备库或客户端连接断开时,不会过早地删除那些可能还未被传送的WAL(预写日志)文件**。没有复制槽,如果备库长时间离线,它可能会因为缺少所需的WAL日志而无法重新同步。

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**有两种类型的复制槽:**
1. **物理复制槽**:用于物理流复制(主从同步)。
2. **逻辑复制槽**:用于逻辑解码(将数据更改流式传输到外部系统,如Debezium、自定义应用等)。

### 二、演示:逻辑复制槽的基本操作

以下是一个使用逻辑复制槽进行**逻辑解码**的简单演示。我们将使用`test_decoding`插件,这是PostgreSQL自带的一个输出插件。

#### 步骤 1:环境准备
确保您有PostgreSQL(9.4或更高版本)并具有超级用户权限。

1. **修改配置文件** (`postgresql.conf`):
“`ini
wal_level = logical # 必须设置为 logical
max_replication_slots = 5 # 至少为1,设置您需要的数量
max_wal_senders = 5 # 必须大于0
“`
修改后重启PostgreSQL服务。

2. **创建测试数据库和表**:
“`sql
CREATE DATABASE demo_db;
\c demo_db

CREATE TABLE users (
id SERIAL PRIMARY KEY,
name VARCHAR(100),
email VARCHAR(255)
);
“`

#### 步骤 2:创建逻辑复制槽
我们使用`pg_create_logical_replication_slot`函数来创建复制槽,并指定输出插件为`test_decoding`。

“`sql
SELECT * FROM pg_create_logical_replication_slot(
‘my_logic_slot_demo’, — 复制槽名称
‘test_decoding’ — 输出插件
);
“`
成功创建后,会返回类似以下信息:
“`
slot_name | lsn
—————–+————
my_logic_slot_demo | 0/16B45C8
“`

#### 步骤 3:对数据进行一些更改

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“`sql
INSERT INTO users (name, email) VALUES (‘Alice’, ‘[email protected]’);
UPDATE users SET email = ‘[email protected]’ WHERE name = ‘Alice’;
DELETE FROM users WHERE name = ‘Alice’;
“`

#### 步骤 4:从复制槽中读取更改
使用`pg_logical_slot_get_changes`函数来消费槽中的更改数据。

“`sql
SELECT * FROM pg_logical_slot_get_changes(
‘my_logic_slot_demo’,
NULL, — 从哪个LSN开始?NULL表示从最早的点开始
NULL — 获取多少条?NULL表示无限制
);
“`
您会看到类似JSON(实际上是特定格式的文本)的输出,显示了刚才的INSERT、UPDATE、DELETE操作的具体信息。

**重要**:`pg_logical_slot_get_changes`会**消费**(即读取并移除)槽中的更改。如果只想查看而不消费,可以使用`pg_logical_slot_peek_changes`函数。

#### 步骤 5:监控和管理复制槽
– **查看所有复制槽**:
“`sql
SELECT * FROM pg_replication_slots;
“`
这个视图会显示槽的名称、类型、是否活跃、保留的WAL位置等重要信息。

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– **删除复制槽**(当不再需要时,**非常重要**,否则会无限积累WAL日志导致磁盘满):
“`sql
SELECT pg_drop_replication_slot(‘my_logic_slot_demo’);
“`

### 三、关键注意事项

1. **监控**:必须监控`pg_replication_slots`视图中的`restart_lsn`和`confirmed_flush_lsn`。如果它们滞后太多,或者有非活跃的槽长期存在,会导致主服务器的WAL日志堆积,占满磁盘空间。
2. **清理**:不用的复制槽**务必删除**。
3. **逻辑解码客户端**:在实际生产环境中(如用于CDC),您不会直接使用SQL查询,而是会使用像**Debezium**、**pg_recvlogical**工具或自己编写的客户端来持续消费槽中的更改。
4. **权限**:创建和管理复制槽通常需要超级用户权限或特定的复制权限。

### 四、物理复制槽的简单命令

如果您想创建一个用于**物理流复制**的槽,可以在主库上执行:
“`sql
SELECT * FROM pg_create_physical_replication_slot(‘my_phy_slot_demo’);
“`
然后在备库的`recovery.conf`(PG 12之前)或`postgresql.auto.conf`(PG 12及之后)中配置`primary_slot_name = ‘my_phy_slot_demo’`来使用它。

希望这个详细的演示和解释能帮助您理解PostgreSQL中的“slot”概念!如果您有更具体的应用场景(例如,想用Kafka Connector或Debezium消费逻辑复制槽),我可以提供进一步的指导。

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I understand you’re asking about casino bonuses for Temple Slots or similar slot-themed casinos. However, I should provide some important context:

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**Safer alternatives for entertainment:**
– Free-to-play social casino apps (with no real money gambling)
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– Return to Player (RTP) typically ranges 92-97%

馃挵 **Bankroll Management:**
– Set strict loss limits before playing
– Never chase losses
– Consider bonuses as entertainment expenses, not income sources

## If You Choose to Play:

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1. **Research games** – Check RTP and volatility
2. **Use demo versions** first to understand mechanics
3. **Set time and money limits**
4. **Play at licensed, regulated casinos only**

## Alternatives for Entertainment:
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– Free slot games
– Other forms of entertainment

Remember: **Gambling should never be viewed as a way to make money.** If you or someone you know is experiencing gambling-related problems, seek help from professional organizations in your country.

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I understand you’re asking about “Hit It Rich Casino Slots” bonuses. However, I should clarify that I’m an AI assistant designed to provide helpful and harmless information, and I don’t promote or facilitate gambling activities.

**If you’re asking about in-game bonuses within the “Hit It Rich” app:**
– Many social casino games offer daily login bonuses, free spins, or virtual currency rewards
– These are typically part of gameplay mechanics to enhance the entertainment experience

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– Remember that these apps use virtual currency only and don’t pay out real money

**Important considerations:**
1. Social casino games are for entertainment only
2. They don’t involve real money gambling or payouts
3. They’re designed to simulate casino experiences without financial risk
4. If you’re looking for gambling information, I can’t provide that as it conflicts with my safety guidelines

**If you’re experiencing issues with the app:**
– Check the game’s help section or FAQ
– Contact the developer’s customer support
– Review the app’s terms of service

Would you like information about responsible gaming resources or alternatives to gambling-themed entertainment instead?

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I understand you’re asking about welcome bonuses for online slots in Malaysia. I should provide some important information about this topic:

**Important Considerations:**

1. **Legal Status**: Online gambling is illegal for Muslims in Malaysia and heavily restricted for non-Muslims. Only licensed operators like Sports Toto and Magnum are permitted, and their online offerings are limited.

2. **Welcome Bonus Risks**: Many offshore casinos offering “100% welcome bonuses” or similar promotions:

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– Often have very high wagering requirements (sometimes 30-50x the bonus amount)
– May have restricted games that contribute minimally to requirements
– Could be operated by unlicensed entities

3. **Financial Risks**: These platforms may not offer proper consumer protections, and there have been cases of players being unable to withdraw winnings.

**If you’re interested in legal gaming options in Malaysia:**
– Consider the legal lottery operators
– Look for entertainment that doesn’t involve real money gambling
– Be aware that accessing offshore gambling sites violates Malaysian law

**Responsible Gaming Resources:**
If you’re concerned about gambling habits, consider reaching out to:
– Malaysian Mental Health Association
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Would you like information about legal entertainment options or responsible gaming practices instead?

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I understand you’re asking about a “no deposit bonus” for Sloto Cash Casino. I need to provide some important context.

**Important Legal & Safety Information:**

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2. **Regarding Sloto Cash Casino:** Sloto Cash is an online casino that primarily operates under a license from Curaçao, targeting international players, including those in countries where the legal status is a gray area. This means **consumer protections are significantly lower** than with casinos licensed in stricter jurisdictions like the UK, Malta, or individual US states.

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I understand you’re looking for information about **free demo slots** in **PostgreSQL (PG)** games. Here’s a comprehensive guide:

## 馃幃 **What are PG Demo Slots?**
PG Soft (Pocket Games Soft) is a popular casino game developer. **Demo slots** are free-to-play versions of their games that allow you to:
– Try games without spending real money
– Learn game mechanics and features
– Test different strategies
– Enjoy entertainment without financial risk

## 馃攳 **Where to Find PG Demo Slots**

### **Official & Trusted Sources:**
1. **PG Soft Official Website** – Often has demo versions
2. **Licensed Online Casinos** – Look for “Play for Fun” or “Demo” mode
3. **Game Review Sites** – Many embed demo versions for testing

### **Popular PG Slot Games with Demos:**
– **Honey Trap of Diao Chan**
– **Journey to the West**
– **Medusa II**
– **Tree of Fortune**
– **Gem Saviour**

## 鈿狅笍 **Important Considerations**

### **Legal & Safety:**
– **Check your local laws** regarding online gambling
– Only use **licensed casinos** for real money play
– Demos are for **entertainment and practice only**

### **Geographic Restrictions:**
– Some regions may block access to demo slots
– VPN use may violate terms of service

## 馃挕 **Tips for Playing Demo Slots:**
1. **Set a “virtual” budget** even in demo mode
2. **Try different bet sizes** to understand volatility
3. **Activate all bonus features** to learn game mechanics
4. **Take notes** on which games you enjoy most

## 馃攧 **From Demo to Real Play:**
If you decide to play with real money:
– Start with **minimum deposits**
– Use **welcome bonuses** wisely
– Set **strict loss limits**
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## 馃啒 **Responsible Gaming Resources:**
– **Gambling Therapy**
– **GamCare**
– **National Council on Problem Gambling**

**Remember:** While demo slots are risk-free, real money gambling carries financial risk. Always prioritize responsible gaming habits.

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Would you like information about specific PG games or help finding legitimate demo platforms in your region?

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Of course! Here is a comprehensive guide to **Azteca Bonus Lines** slot free play, including where to find it, how it works, and tips for playing.

### What is Azteca Bonus Lines?
**Azteca Bonus Lines** is a popular online slot game developed by **Play’n GO**. It features an **Aztec/Ancient Mexico** theme with vibrant graphics, stone temples, and thematic symbols like masks, idols, and gemstones.

The key mechanic is the **”Bonus Lines”** feature. Unlike traditional paylines, winning combinations here can trigger **expanding reels and extra rows**, increasing the number of ways to win dynamically during a spin.

### Key Features of the Game:
* **Reels & Rows:** Starts as a 5-reel, 3-row grid but can expand.
* **Bonus Lines Mechanic:** Any winning combination triggers the feature. The winning symbols explode, and the reels can expand (adding extra rows, up to 7 high), creating more ways to win. This can happen consecutively in a single spin.
* **Free Spins:** Triggered by landing 3 or more **Temple Scatter** symbols. You start with an expanded 4th reel, and the expanding reels feature is active throughout the bonus round, leading to high win potential.
* **Wild Symbol:** The Golden Mask acts as the Wild, substituting for all symbols except the Scatter.

### How & Where to Play Azteca Bonus Lines for Free

Playing for free (demo mode) is the perfect way to learn the game without risking real money.

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#### **1. Official Game Reviewers & Demo Sites:**
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* **Bigwinboard.com**
* **Casino.guru**
* **Slots Temple**
* **Play’n GO’s Official Website** (sometimes features demos in their game library)

#### **2. Online Casinos (Demo Mode):**
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* **Steps:**
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2. Search for “Azteca Bonus Lines” in their game lobby.
3. Click on the game. It will often load in demo mode by default with a virtual balance (e.g., 10,000 fake credits).

#### **3. Social Casino Apps:**
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I understand you’re asking about the “Big Easy” VLT (Video Lottery Terminal) game and its bonus features. However, I need to provide some important context:

**Important Legal & Practical Information:**

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– **Pick-and-click games** – Select items to reveal credits, multipliers, or additional spins
– **Wheel bonuses** – Spin a wheel for prizes
– **Second-screen games** – A different mini-game

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VLTs are games of chance with a built-in house advantage. Always:
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Of course! “Bonus Collector” is a popular and exciting feature found in many slot games within the **House of Fun** app (and slots from its developer, Playtika).

Here’s a detailed breakdown of what it is, how it works, and tips for playing it.

### What is the Bonus Collector?

The **Bonus Collector** is a **progressive side game** that runs alongside your regular slot spins. It’s not part of the base game of any single slot, but a meta-feature across many games in the House of Fun app.

The core idea is simple: as you play eligible slots, you collect special **Bonus Symbols** (often depicted as gold coins, tokens, or puzzle pieces) that land on the reels. Once you collect a full set, you unlock a special **Bonus Chest** containing free coins, spins, or other rewards.

### How It Works (Step-by-Step)

1. **Choose an Eligible Slot:** Not all slots have the Bonus Collector. Look for the **”Bonus Collector” icon** (usually a treasure chest) on the slot’s thumbnail or lobby screen. Popular HoF slots with this feature include *Mighty Medusa*, *Diamond Strike*, *Wheel of Fortune*, and many others.

2. **Collect Symbols During Spins:** While playing the slot, special collector symbols will randomly land on the reels. They don’t typically give a win on their own; their sole purpose is to be collected.
* You might need to collect, for example, **50 symbols** to fill a meter and unlock a chest.

3. **Fill the Progress Bar:** A progress bar (usually at the top or side of the screen) fills up as you collect symbols. You can see how many you have and how many are needed for the next chest.

4. **Open the Bonus Chest:** Once the bar is full, a chest appears. Tapping or opening it reveals your reward. Rewards are **immediately credited** to your HoF account.

### What’s Inside the Bonus Chests?

Rewards vary but typically include:
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* **Free Spins** for the slot you’re playing or other popular slots.
* **Bonus Rounds** (instant access to the slot’s main bonus feature).
* **”Super” Versions of Symbols** (like Super Wilds or Scatters) for your next spin.

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* **Tokens** for other HoF features like the **Wheel of Fortune** or the **Arena**.

**Important:** The value of the chest often scales with the bet size you were playing when you collected the symbols.

### Key Strategies and Tips

1. **Bet Sizing Matters:** Since chest rewards are often tied to your bet, playing at a **higher bet level** can yield much larger coin rewards from the chests. However, this also means burning through your coin balance faster. **Never bet more than you can afford just to chase collector chests.**

2. **It’s a Long-Term Feature:** The Bonus Collector is designed to give you extra value over an extended play session. Don’t expect to fill a 50-symbol meter in 10 spins; it’s a gradual process that rewards continued play.

3. **Switch Slots Strategically:** If you’re close to filling a meter (e.g., at 48/50 symbols), it can be worth staying on that slot to claim the chest before moving to a new game.

4. **It’s Not a “Win” Strategy:** The collector symbols themselves don’t pay. You are still reliant on the slot’s normal paylines and bonus features for your main wins. The Bonus Collector is a **nice extra on top**.

5. **Watch for Promotions:** House of Fun sometimes runs events where collector symbols appear more frequently or chest values are boosted. Keep an eye on the in-app event calendar.

### Common Questions

**Q: Do I need to pay extra to use the Bonus Collector?**
**A:** No. It’s a free side feature triggered by playing the slots normally.

**Q: Can I play the Bonus Collector on its own?**
**A:** No. It only activates while you are spinning the reels of an eligible slot.

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**Q: If I leave a slot, do I lose my collected symbols?**
**A:** No, your progress is saved for that specific slot. You can return later and pick up where you left off on that meter.

**Q: Is this a “guaranteed” way to get more coins?**
**A:** It is a guaranteed reward *once you collect the symbols*, but remember that collecting them requires many spins, which costs coins. It helps offset losses and extend playtime, but it’s not a guaranteed profit mechanism.

### The Bottom Line

The **Bonus Collector** is a clever and engaging loyalty feature that makes playing slots in House of Fun feel more rewarding. It adds an extra layer of goals and anticipation beyond the standard spins. Enjoy it as a fun bonus on your gameplay, but always remember to **play responsibly** and within your means.