这将连接到ZEO服务器，并发出一条导致服务器压缩数据库的特殊指令。
This will connect to your ZEO server and issue a special order that will induce the server to pack your database.
STAR_JOIN—STAR_JOIN指令指示优化器尽可能地选择星型连接计划。
STAR_JOIN - the STAR_JOIN directive instructs the optimizer to favor a star join plan whenever possible.
为进行星型连接优化引入了新的优化器指令。
New optimizer directives are introduced for star join optimization.
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