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   idxflushmb
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   idxflushmb
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           Threshold (megabytes of new text data) where we flush from memory
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           Threshold (megabytes of new text data) where we flush from memory
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           to disk index. Setting this can help control memory usage. A value
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           to disk index. Setting this can help control memory usage. A value
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           of 0 means no explicit flushing, letting Xapian use its own
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           of 0 means no explicit flushing, letting Xapian use its own
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           default, which is flushing every 10000 documents (memory usage
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           default, which is flushing every 10000 (or XAPIAN_FLUSH_THRESHOLD)
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           documents, which gives little memory usage control, as memory
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           depends on average document size). The default value is 10.
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           usage depends on average document size. The default value is 10.
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    5.4.1.4. Miscellaneous parameters:
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    5.4.1.4. Miscellaneous parameters:
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