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- 4. _S_p_e_c_i_a_l__N_o_t_e_s__o_n__U_s_e__o_f__T_h_i_s__P_r_o_d_u_c_t
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- The database accelerator (DBA) is designed to speed up your
- Oracle, Informix, or Sybase database server. In some cases
- your database server has been specially coded to take
- advantage of features in the database accelerator (such as
- the postwait driver for all versions of Oracle, and the
- special async I/O support in Oracle version 7). You will
- need to install this software and refer to your platform-
- specific database server documentation to find out how to
- make your server take advantage of DBA.
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- Kernel asynchronous I/O (sometimes referred to as KAIO) is
- designed to work invisibly with an application that uses
- POSIX asynchronous I/O but follows certain strict
- conditions. Silicon Graphics and the database server
- companies work together to make sure those conditions are
- always met.
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- However, DBA 3.0 for IRIX 6.5 is incompatible with some
- older versions of the Informix database server. Please
- contact Informix Corp. for more information. The symptom of
- the problem is that the Informix server will hang after
- several thousand disk I/O requests have been submitted.
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- If you are running Informix, you should not install this
- product unless your documentation specifically states that
- your version of Informix will work with DBA on IRIX 6.5.
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- 4.1 _E_n_a_b_l_i_n_g__K_A_I_O
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- Some database servers are aware of the presence or absence
- of KAIO on IRIX and can automatically take advantage of it
- if present. For these servers, you will not need to do
- anything.
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- Other servers may require you to set a configuration
- variable to take advantage of KAIO. You will need to consult
- your database server documentation (probably the IRIX-
- specific release notes) or contact your database company's
- support organization to find out if there is such a
- variable.
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- An others, particularly older versions, are unaware of KAIO
- and do not have a way for the database server to enable it
- itself. You can force KAIO on for these database servers by
- setting an environment variable before starting your server.
- You may also need to set the environment variable for
- application processes as well (for example, a TWO_TASK
- Oracle application). To forcibly enable KAIO:
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- 1. In csh or tcsh, type
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- sssseeeetttteeeennnnvvvv ________SSSSGGGGIIII____UUUUSSSSEEEE____DDDDBBBBAAAA 1111
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- 2. In sh or ksh or bash, type
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- eeeexxxxppppoooorrrrtttt ________SSSSGGGGIIII____UUUUSSSSEEEE____DDDDBBBBAAAA;;;; ________SSSSGGGGIIII____UUUUSSSSEEEE____DDDDBBBBAAAA====1111
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- In some cases, your database server company may inform you
- that use of certain features in the IRIX database
- accelerator is unsupported.
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