From 780b92ada9afcf1d58085a83a0b9e6bc982203d1 Mon Sep 17 00:00:00 2001 From: Lorry Tar Creator Date: Tue, 17 Feb 2015 17:25:57 +0000 Subject: Imported from /home/lorry/working-area/delta_berkeleydb/db-6.1.23.tar.gz. --- docs/programmer_reference/dumpload.html | 58 +++++++++++++++++++++++++-------- 1 file changed, 45 insertions(+), 13 deletions(-) (limited to 'docs/programmer_reference/dumpload.html') diff --git a/docs/programmer_reference/dumpload.html b/docs/programmer_reference/dumpload.html index 5489304e..5597a5a9 100644 --- a/docs/programmer_reference/dumpload.html +++ b/docs/programmer_reference/dumpload.html @@ -14,13 +14,12 @@
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Library Version 11.2.5.3

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Library Version 12.1.6.1

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Chapter 23.  - Dumping and Reloading Databases -

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Chapter 23.  Dumping and Reloading Databases +

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There are three utilities used for dumping and loading Berkeley DB databases: the db_dump utility, the db_dump185 utility and the db_load utility.

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The db_dump utility and the db_dump185 utility dump Berkeley DB databases into a flat-text representation of the data that can be read by db_load utility. The only difference between them is that the db_dump utility reads Berkeley DB version 2 and greater database formats, whereas the db_dump185 utility reads Berkeley DB version 1.85 and 1.86 database formats.

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The db_load utility reads either the output format used by the dump utilities or (optionally) a flat-text representation created using other tools, and stores it into a Berkeley DB database.

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Dumping and reloading Hash databases that use user-defined hash functions will result in new databases that use the default hash function. Although using the default hash function may not be optimal for the new database, it will continue to work correctly.

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Dumping and reloading Btree databases that use user-defined prefix or comparison functions will result in new databases that use the default prefix and comparison functions. In this case, it is quite likely that applications will be unable to retrieve records, and it is possible that the load process itself will fail.

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The only available workaround for either Hash or Btree databases is to modify the sources for the db_load utility to load the database using the correct hash, prefix, and comparison functions.

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+ There are three utilities used for dumping and loading + Berkeley DB databases: the db_dump utility, the db_dump185 utility and the + db_load utility. +

+

+ The db_dump utility and the db_dump185 utility dump Berkeley DB + databases into a flat-text representation of the data that can + be read by db_load utility. The only difference between them is that + the db_dump utility reads Berkeley DB version 2 and greater database + formats, whereas the db_dump185 utility reads Berkeley DB version + 1.85 and 1.86 database formats. +

+

+ The db_load utility reads either the output format used by the + dump utilities or (optionally) a flat-text representation + created using other tools, and stores it into a Berkeley DB + database. +

+

+ Dumping and reloading Hash databases that use user-defined + hash functions will result in new databases that use the + default hash function. Although using the default hash + function may not be optimal for the new database, it will + continue to work correctly. +

+

+ Dumping and reloading Btree databases that use user-defined + prefix or comparison functions will result in new databases + that use the default prefix and comparison functions. In this + case, it is quite likely that applications will be unable to + retrieve records, and it is possible that the load process + itself will fail. +

+

+ The only available workaround for either Hash or Btree + databases is to modify the sources for the db_load utility to load + the database using the correct hash, prefix, and comparison + functions. +

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Chapter 23.  - Dumping and Reloading Databases - Chapter 23.  Dumping and Reloading Databases +
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