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static MYSQL_SYSVAR_BOOL(doublewrite, innobase_use_doublewrite,
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PLUGIN_VAR_NOCMDARG | PLUGIN_VAR_READONLY,
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"Enable InnoDB doublewrite buffer (enabled by default). "
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MYSQL_SYSVAR(old_blocks_pct),
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MYSQL_SYSVAR(old_blocks_time),
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MYSQL_SYSVAR(open_files),