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If you have 4 GB or more RAM use the Linux kernel compiled for PAE capable machines. Your machine may not show up total 4GB ram. All you have to do is install PAE kernel package.

This package includes a version of the Linux kernel with support for up to 64GB of high memory. It requires a CPU with Physical Address Extensions (PAE).

The non-PAE kernel can only address up to 4GB of memory. Install the kernel-PAE package if your machine has more than 4GB of memory (>=4GB).

# yum install kernel-PAE

If you want to know how much memory centos is using type this in a terminal:

# cat /proc/meminfo
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The ShellEd plugin is a good shell editor for Eclipse
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Recital on Linux 64 bit requires certain 32 bit libraries for installation and/or operation.  It also needs to be installed and configured as the root user, or using sudo for those systems without a root login.

For systems that do not have the xterm libraries installed, please install these to use xterm, or set the DB_TERM environment variable to start Recital from a terminal:
DB_TERM=gnome-terminal; export DB_TERM

This setting can be added to the /opt/recital/conf/recital.conf (text) file to make it available system-wide.

Please note that the Recital ODBC Driver for Linux requires a 32 bit ODBC Driver Manager.

Centos 6:

sudo yum install zlib-devel.i686 pam-devel.i686
(and accept dependencies)
Then run the installer in text mode
sudo ./recital-10.0.3-linux32.bin --mode text
Run Recital with sudo the first time, to set the system filetype compatiblity settings.
sudo recital
After saving the compatibility settings, quit to exit, then run Recital as your preferred user.
> quit
$ recital

RedHat / Fedora family:

sudo yum install zlib-devel.i686 pam.i686
(and accept dependencies)
Then run the installer in text mode
sudo ./recital-10.0.3-linux32.bin --mode text
Run Recital with sudo the first time, to set the system filetype compatiblity settings.
sudo recital
After saving the compatibility settings, quit to exit, then run Recital as your preferred user.
> quit
$ recital

 Ubuntu family:

sudo apt-get install ia32-libs 
In later versions of Ubuntu, ia32-libs is obsolete. The following package should be installed:
sudo apt-get install lib32z1
Ubuntu 12.04 and above also require the following:
sudo apt-get install libpam0g:i386
Then run the installer in text mode
sudo ./recital-10.0.3-linux32.bin --mode text
Run Recital with sudo the first time, to set the system filetype compatiblity settings.
sudo recital
After saving the compatibility settings, quit to exit, then run Recital as your preferred user.
> quit
$ recital

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Opening SSH to the outside world is a security risk. Here is how to restrict SSH access to certain IP addresses on a machine.

  1. Edit the /etc/hosts.allow file to include these lines, assuming your machine is on the 192.168.2.x nonrouting IP block, and you want to enable an external address of 217.40.111.121 IP block: Remember to add the period on the end of each incomplete IP number. If you have another complete IP address or range, add a space and that range on the end.

    sshd,sshdfwd-X11: 192.168.2. 217.40.111.121
  2. Edit your /etc/hosts.deny file to include this line:

    sshd,sshdfwd-X11:ALL 
  3. These lines refuse SSH connections from anyone not in the IP address blocks listed.

Additionally you can restrict SSH access by username.

  1. Edit the /etc/ssh/sshd_config file and add the following lines

    PermitRootLogin no
    AllowUsers      user1 user2 user3 etc
    PasswordAuthentication yes

Now restart the ssh daemon for these changes to take effect

service sshd restart




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A good article describing the configuration of samba for file/record locking can be found here.

Basically you must add these directives to the smb.conf file:

[data] 
oplocks = False 
level2 oplocks = False

The default oplock type is Level1. Level2 oplocks are enabled on a per-share basis in the smb.conf file. Alternately, you could disable oplocks on a per-file basis within the share: 

veto oplock files = /*.dbf/*.DBF/*.ndx/*.NDX/*.dbx/*.DBX/*.dbt/*.DBT/

You can further tune samba by following this guide.

If you specify the Common Internet File System (CIFS) when you mount the samba share then you must specify the following options
mount -t cifs {mount-point} -o username=name,pass=pass,directio
The directio option is used to not do inode data caching on files opened on this mount. This precludes mmaping files on this mount. In some cases with fast networks and little or no caching benefits on the client (e.g. when the application is doing large sequential reads bigger than page size without rereading the same data) this can provide better performance than the default behavior which caches reads (readahead) and writes (writebehind) through the local Linux client pagecache if oplock (caching token) is granted and held. Note that direct allows write operations larger than page size to be sent to the server.

If you get the following error when trying to mount the {mount-point}
Apr 22 16:57:39 bailey kernel: Status code returned 0xc000006d NT_STATUS_LOGON_FAILURE
Apr 22 16:57:39 bailey kernel:  CIFS VFS: Send error in SessSetup = -13
Apr 22 16:57:39 bailey kernel:  CIFS VFS: cifs_mount failed w/return code = -13
The you need to create the Samba user specified on the mount command
smbpasswd -a username
FYI - Make sure you umount all the Samba {mount-point(s)} before shutting down Samba.
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Recital 10 enhances the way updating tables with indexes is done. The Recital engine will now evaluate each index individually to determine if any changes being made to the row effect it. If this is not the case then the index is flagged not to be updated. This enhancement helps speed up performance of updates and is particularly noticeable in cluster/network installations.
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By default Recital uses PAM to authenticate users.  It is also possible to tell PAM to use Kerberos.  Simply replace the existing entries in the /etc/pam.d/recital file with the ones below:

auth       sufficient   pam_krb5.so try_first_pass
auth       sufficient   pam_unix.so shadow nullok try_first_pass
account    required     pam_unix.so broken_shadow
account    [default=bad success=ok user_unknown=ignore] pam_krb5.so
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If you want details about how storage devices are performing on Redhat/Centos/Fedora use the vmstat and iostat commands.

After installing Centos 5.3 the iostat command is not available. To install it use yum:

# yum install sysstat
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The best way to learn Recital is to build some applications. The developers of Recital have written a book "Recital Essentials" which you can read here.
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In this article Barry Mavin, CEO and Chief Software Architect for Recital provides details on how the Recital Database Server can be used to provide a solution for Universal Data Integration.

Overview

The Recital Database Server handles universal cross-platform data access to a wide range of data sources. The database server natively handles full remote SQL data access to Recital, Visual FoxPro, FoxPro, FoxBASE, Clipper and older dBase data. Using Bridges, it handles full remote SQL data access to C-ISAM and OpenVMS RMS. Using gateway connections, it handles full remote SQL data access to Oracle, MySQL, PostgreSQL, SQL Server, server-side ODBC, server-side JDBC and server-side OLE DB data sources. With its ability to access data using server-side ODBC, JDBC and OLE DB drivers from clients on all supported operating systems (Windows, Linux, Unix, OpenVMS), the Recital Database Server is an ideal Data Integration Solution for applications of all sizes and complexity.

Universal Data Integration Solutions

There are several ways in which data may be accessed by the Database Server.

Table 1:

Client Universal Data Access solutions for accessing local or remote data.


Client Solution
Recital Use remote gateway connections
Visual FoxPro Use the Universal ODBC Driver
Java (all platforms) Use the Universal JDBC Driver
.NET Framework Use the Universal .NET Data Provider
Microsoft Office Use the Universal ODBC Driver
Windows Mobile Use the Universal Compact Framework .NET Data Provider
PHP on Linux Use the Universal ODBC Driver for Linux
Mono on Linux Use the Universal .NET Data Provider
Others If the data source you want to access is not in the list above, then you can use a remote ODBC, JDBC or OLE DB gateway.
You can find examples of connection strings for most ODBC and OLE DB data sources by clicking here.

Table 2:

Windows Server Universal Data Access solutions accessible from any remote client running on Windows, Linux, Unix or OpenVMS:


Data Source Solution
Recital Native support (See table 1)
Visual FoxPro Native support (See table 1)
FoxPro Native support (See table 1)
FoxBASE Native support (See table 1)
Clipper Native support (See table 1)
dBase Native support (See table 1)
C-ISAM Use a bridge (See table 1)
Access Use a gateway connection
gateway="oledb:Provider=Microsoft.Jet.OLEDB.4.0;Data Source=\somepath\mydb.mdb;User Id=admin;Password=;"
Exchange Use a gateway connection
gateway="oledb:Provider=ExOLEDB.DataSource;Data Source=http://servername/publicstore"
Excel Use a gateway connection
gateway="oledb:Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\MyExcel.xls;"
Oracle Use a gateway connection
gateway="oledb:Provider=msdaora;Data Source=TheOracleDB;User Id=xxxxx;Password=xxxxx;"
SQL Server Use a gateway connection
gateway="oledb:Provider=sqloledb;Data Source=Aron1;Initial Catalog=pubs;User Id=sa;Password=asdasd;"
MySQL Use a gateway connection
gateway="oledb:Provider=MySQLProv;Data Source=mydb;User Id=xxxxx;Password=xxxxx;"
IBM DB2 Use a gateway connection
gateway="oledb:Provider=DB2OLEDB;Network Transport Library=TCPIP;Network Address=XXX.XXX.XXX.XXX;Initial Catalog=MyCtlg;Package Collection=MyPkgCol;Default Schema=Schema;User ID=MyUser;Password=MyPW"
Sybase ASA Use a gateway connection
gateway="oledb:Provider=ASAProv;Data source=myASA"
Sybase ASE Use a gateway connection
gateway="oledb:Provider=Sybase.ASEOLEDBProvider;Srvr=myASEserver,5000;Catalog=myDBname;User Id=username;Password=password"
IBM Informix Use a gateway connection
gateway="oledb:Provider=Ifxoledbc.2;password=myPw;User ID=myUser;Data Source=dbName@serverName;Persist Security Info=true"
Ingres Use a gateway connection
gateway="odbc:dsn=data_source_name"
Firebird Use a gateway connection
gateway="odbc:dsn=data_source_name"
IBM AS400 iSeries Use a gateway connection
gateway="oledb:PROVIDER=IBMDA400; DATA SOURCE=MY_SYSTEM_NAME;USER ID=myUserName;PASSWORD=myPwd"
Interbase Use a gateway connection
gateway="oledb:provider=sibprovider;location=localhost:;data source=c:\databases\gdbs\mygdb.gdb;user id=xxxxx;password=xxxxx"
Others

If the data source you want to access is not in the list above, then you can use server-side ODBC, JDBC or OLE DB.
You can find examples of connection strings for most ODBC and OLE DB data sources by clicking here.
Full details on using server-side JDBC drivers can be found here.
Full details on using server-side ODBC drivers can be found here.
Full details on using server-side OLE DB drivers can be found here.


Table 3:

Linux and Unix Server Universal Data Access solutions accessible from any remote client running on Windows, Linux, Unix or OpenVMS:


Data Source Solution
Recital Native support (See table 1)
Visual FoxPro Native support (See table 1)
FoxPro Native support (See table 1)
FoxBASE Native support (See table 1)
Clipper Native support (See table 1)
dBase Native support (See table 1)
C-ISAM Use a bridge (See table 1)
Oracle Use a gateway connection
gateway="oracle:Connection_String"
MySQL Use a gateway connection
gateway="mysql:Connection_String"
IBM DB2 Use a gateway connection
gateway="db2:Connection_String"
PostgreSQL Use a gateway connection
gateway="postgres:Connection_String"
Others

If the data source you want to access is not in the list above, then you can use a server-side JDBC driver.
Full details on using server-side JDBC drivers can be found here.


Table 4:

OpenVMS Server Universal Data Access solutions accessible from any remote client running on Windows, Linux, Unix or OpenVMS:


Data Source Solution
Recital Native support (See table 1)
Visual FoxPro Native support (See table 1)
FoxPro Native support (See table 1)
FoxBASE Native support (See table 1)
Clipper Native support (See table 1)
dBase Native support (See table 1)
RMS Use a bridge (See table 1)
Others

If the data source you want to access is not in the list above, then you can use a server-side JDBC driver.

Supported Data Sources

Native Data Access

The Recital Database Server has native built-in support for the following data sources:

  • Recital
  • Visual FoxPro
  • FoxPro
  • FoxBASE
  • Clipper
  • dBase

You can setup tables to work with using the Database Administration Tool in Recital Enterprise Studio.

Bridges

Using Bridges, you can access the following data sources as if they were standard Recital/FoxPro tables:

  • CISAM
  • OpenVMS RMS

You can setup bridges using the Database Administration Tool in Recital Enterprise Studio.

Gateways/Connections

Using Gateways, you can transparently access the following local or remote data sources:

  • Recital
  • Oracle
  • ODBC (Server-side ODBC data sources)
  • JDBC (Server-side JDBC data sources)
  • OLEDB Use this to connect to SQL Server and other Windows OLE DB data sources)
  • MySQL
  • PostgreSQL

Remote Data Object functions

Recital 10 includes a complete and robust set of data source independent functions for accession MySQL, Oracle, DB2 and Postgres. This article explains how to use them.

Client Data Access drivers

Included with the Recital Database Server are three Client drivers. These Client drivers can access any data sources supported by the Recital Database Server. They are not restricted to accessing only Recital data. They can be used to access server-side ODBC, JDBC and OLE DB data sources also.

Recital Universal .NET Data Provider

Use this client driver when building .NET applications with Visual Studio .NET. A data provider in the .NET Framework serves as a bridge between an application and a data source. A data provider is used to retrieve data from a data source and to reconcile changes to that data back to the data source.

Key features of the Recital Universal .NET Data Provider:

  • Fully Internet enabled
    The Recital Universal .NET Data Provider works across the internet providing access to a wide range of data sources located on remote servers running Windows, Linux, Unix and OpenVMS.
  • SQL Server compatible
    The Recital Universal .NET Data Provider is plug compatible with the .NET Framework SQL Server Data Provider.
  • Cross-platform Data Integration
    Using the Recital Universal .NET Data Provider, you can connect to remote Windows, Linux, Unix or OpenVMS servers and access any data source supported by the Recital Database Server.
  • Managed code
    The Recital Universal .NET Data Adaptor written in C# is 100% .NET Framework managed code.
  • Runs on Windows Mobile
    The Recital Universal .NET Data Adaptor runs under the .NET Compact Framework on Windows Mobile.
Recital Universal JDBC Driver

The JDBC API is the industry standard for database-independent connectivity between the Java programming language and a wide range of databases. The JDBC API provides a call-level API for SQL-based database access. JDBC technology allows you to use the Java programming language to exploit "Write Once, Run Anywhere" capabilities for applications that require access to enterprise data.

Key features of the Recital Universal JDBC Driver:

  • Fully Internet enabled
    The Recital Universal JDBC driver works across the internet providing access to a wide range of data sources located on remote servers running Windows, Linux, Unix and OpenVMS.
  • JDBC 3.0 API
    The Recital Universal JDBC driver supports the JDBC 3.0 API.
  • Pure Java Type 3 Driver
    The Recital Universal JDBC driver is a 100% pure Java Type 3 driver.
  • Full Access to Metadata
    The JDBC API provides metadata access that enables the development of sophisticated applications that need to understand the underlying facilities and capabilities of a specific database connection.
  • Cross-platform Data Integration
    Using the Recital Universal JDBC driver, you can connect to remote Windows, Linux, Unix or OpenVMS servers and access any data source supported by the Recital Database Server.
  • No Installation
    A pure JDBC technology-based driver does not require special installation; it is automatically downloaded as part of the applet that makes the JDBC calls. The Recital Universal JDBC Driver is 100% java.
Recital Universal ODBC Driver

Connect to remote data from Microsoft Office or other applications that support ODBC data access. The Recital Universal ODBC Driver is also available for Linux and Unix.

Key features of the Recital Universal ODBC Driver:

  • Fully Internet enabled
    The Recital Universal ODBC driver works across the internet providing access to a wide range of data sources located on remote servers running Windows, Linux, Unix and OpenVMS.
  • Works with Crystal Reports
    The Recital Universal ODBC driver supports the SQL syntax generated by Crystal Reports.
  • Works with Microsoft Office
    The Recital Universal ODBC driver works with Microsoft Office products.
  • Works with PHP on Linux
    The Recital Universal ODBC driver is available for Linux and works with PHP.
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