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Oracle® In-Memory Database Cache User's Guide
11g Release 2 (11.2.2)

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Oracle TimesTen In-Memory Database (TimesTen) is a relational database that is memory-optimized for fast response and throughput. The database resides entirely in memory at run time and is persisted to disk storage for the ability to recover and restart. Replication features allow high availability. TimesTen supports standard application interfaces JDBC, ODBC, and ODP.NET, in addition to Oracle interfaces PL/SQL, OCI, and Pro*C/C++. TimesTen is available separately or as a cache for Oracle Database.

Oracle In-Memory Database Cache is an Oracle Database product option that is ideal for caching performance-critical subsets of an Oracle database into cache tables within TimesTen databases for improved response time in the application tier. Cache tables can be read-only or updatable. Applications read and update the cache tables using standard Structured Query Language (SQL) while data synchronization between the TimesTen database and the Oracle database is performed automatically.

Oracle In-Memory Database Cache offers applications the full generality and functionality of a relational database, the transparent maintenance of cache consistency with the Oracle database, and the real-time performance of an in-memory database.


This guide is for application developers who use and administer TimesTen, and for system administrators who configure and manage TimesTen databases that cache data from Oracle databases. To work with this guide, you should understand how relational database systems work. You should also have knowledge of SQL, and either Open Database Connectivity (ODBC), Java Database Connectivity (JDBC), or Oracle Call Interface (OCI).

Related documents

TimesTen documentation is available on the product distribution media and on the Oracle Technology Network (OTN):

Oracle Database documentation is also available on the Oracle Technology network. This may be especially useful for Oracle Database features that TimesTen supports, but does not document.


TimesTen supports multiple platforms. Unless otherwise indicated, the information in this guide applies to all supported platforms. The term Windows refers to all supported Windows platforms. The term UNIX applies to all supported UNIX and Linux platforms. See "Platforms" in Oracle TimesTen In-Memory Database Release Notes for specific platform versions supported by TimesTen.


In TimesTen documentation, the terms "data store" and "database" are equivalent. Both terms refer to the TimesTen database.

This document uses the following text conventions:

Convention Meaning
boldface Boldface type indicates graphical user interface elements associated with an action, or terms defined in text.
italic Italic type indicates book titles, emphasis, or placeholder variables for which you supply particular values.
monospace Monospace type indicates commands within a paragraph, URLs, code in examples, text that appears on the screen, or text that you enter.
italic monospace Italic monospace type indicates a variable in a code example that you must replace. For example:


Replace TimesTen_install_dir with the path of your TimesTen installation directory.

[ ] Square brackets indicate that an item in a command line is optional.
{ } Curly braces indicate that you must choose one of the items separated by a vertical bar ( | ) in a command line.
| A vertical bar separates alternative arguments.
. . . An ellipsis (. . .) after an argument indicates that you may use more than one argument on a single command line.
% The percent sign indicates the UNIX shell prompt.
# The number (or pound) sign indicates the prompt for the UNIX root user.

TimesTen documentation uses these variables to identify path, file and user names:

Convention Meaning
TimesTen_install_dir The path that represents the directory where the current release of TimesTen is installed.
TTinstance The instance name for your specific installation of TimesTen. Each installation of TimesTen must be identified at install time with a unique alphanumeric instance name. This name appears in the install path.
bits or bb Two digits, 32 or 64, that represent either the 32-bit or 64-bit version of the operating system.
release or rr The first three parts in a release number, with or without dots. The first three parts of a release number represent a major TimesTen release. For example, 1122 or 11.2.2 represents TimesTen 11g Release 2 (11.2.2).
jdk_version One or two digits that represent the major version number of the Java Development Kit (JDK) release. For example, 5 represents JDK 5.
DSN The data source name.

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