Library Version 18.1.40

Preface
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## Preface

This document describes how to write replicated applications for Berkeley DB 18 Release 18.1 (library version 18.1.40). The APIs used to implement replication in your application are described here. This book describes the concepts surrounding replication, the scenarios under which you might choose to use it, and the architectural requirements that a replication application has over a transactional application.

This book is aimed at the software engineer responsible for writing a replicated DB application.

This book assumes that you have already read and understood the concepts contained in the Berkeley DB Getting Started with Transaction Processing guide.

## Conventions Used in this Book

The following typographical conventions are used within in this manual:

Structure names are represented in `monospaced font`, as are `method names`. For example: "`DB->open()` is a method on a `DB` handle."

Variable or non-literal text is presented in italics. For example: "Go to your DB_INSTALL directory."

Program examples are displayed in a `monospaced font` on a shaded background. For example:

    /* File: gettingstarted_common.h */
    typedef struct stock_dbs {
        DB *inventory_dbp; /* Database containing inventory information */
        DB *vendor_dbp;    /* Database containing vendor information */

        char *db_home_dir;       /* Directory containing the database
                                  * files */
        char *inventory_db_name; /* Name of the inventory database */
        char *vendor_db_name;    /* Name of the vendor database */
    } STOCK_DBS;

In some situations, programming examples are updated from one chapter to the next. When this occurs, the new code is presented in `monospaced bold` font. For example:

    typedef struct stock_dbs {
        DB *inventory_dbp; /* Database containing inventory information */
        DB *vendor_dbp;    /* Database containing vendor information */
        DB *itemname_sdbp; /* Index based on the item name index */
        char *db_home_dir;       /* Directory containing the database
                                  * files */
        char *itemname_db_name;  /* Itemname secondary database */
        char *inventory_db_name; /* Name of the inventory database */
        char *vendor_db_name;    /* Name of the vendor database */
    } STOCK_DBS;

### Note

Finally, notes of special interest are represented using a note block such as this.

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