explain select count(0) from ( select distinct RES.ID_, RES.NAME_, ART.ASSIGNEE_, A0.TEXT_ as 'status', RES.START_TIME_, RES.END_TIME_, RES.BUSINESS_KEY_ from ACT_HI_PROCINST RES left outer join ACT_RE_PROCDEF DEF on RES.PROC_DEF_ID_ = DEF.ID_ inner join ACT_HI_VARINST A0 on RES.PROC_INST_ID_ = A0.PROC_INST_ID_ and a0.TASK_ID_ is null and A0.NAME_ = '@global_process_status' and A0.VAR_TYPE_ = 'integer' inner join ACT_HI_VARINST A1 on RES.PROC_INST_ID_ = A0.PROC_INST_ID_ and a0.TASK_ID_ is null and A1.NAME_ = '@process_form_structure' and A1.VAR_TYPE_ = 'string' left join ACT_RU_TASK ART on RES.ID_ = art.PROC_INST_ID_ where (exists ( select LINK.USER_ID_ from ACT_HI_IDENTITYLINK LINK where USER_ID_ in ("1") and LINK.PROC_INST_ID_ = RES.ID_))) table_count 怎么加索引
时间: 2023-07-27 08:07:00 浏览: 52
首先需要确认哪些列在查询中使用频繁,可以使用 EXPLAIN 分析查询语句,找到慢查询的具体原因。
在这个查询中,以下列被使用了:
- ACT_HI_PROCINST.START_TIME_
- ACT_HI_PROCINST.END_TIME_
- ACT_HI_PROCINST.BUSINESS_KEY_
- ACT_RU_TASK.ASSIGNEE_
因此,可以考虑在这些列上创建索引来优化查询性能。具体如下:
```
CREATE INDEX idx_act_hi_procinst_start_end_time ON ACT_HI_PROCINST (START_TIME_, END_TIME_);
CREATE INDEX idx_act_hi_procinst_business_key ON ACT_HI_PROCINST (BUSINESS_KEY_);
CREATE INDEX idx_act_ru_task_assignee ON ACT_RU_TASK (ASSIGNEE_);
```
注意,索引并不是万能的,需要根据实际情况进行优化和调整。
相关问题
explain select count(0) from ( select distinct RES.ID_, RES.NAME_, ART.ASSIGNEE_, A0.TEXT_ as 'status', RES.START_TIME_, RES.END_TIME_, RES.BUSINESS_KEY_ from ACT_HI_PROCINST RES left outer join ACT_RE_PROCDEF DEF on RES.PROC_DEF_ID_ = DEF.ID_ inner join ACT_HI_VARINST A0 on RES.PROC_INST_ID_ = A0.PROC_INST_ID_ and a0.TASK_ID_ is null and A0.NAME_ = '@global_process_status' and A0.VAR_TYPE_ = 'integer' inner join ACT_HI_VARINST A1 on RES.PROC_INST_ID_ = A0.PROC_INST_ID_ and a0.TASK_ID_ is null and A1.NAME_ = '@process_form_structure' and A1.VAR_TYPE_ = 'string' left join ACT_RU_TASK ART on RES.ID_ = art.PROC_INST_ID_ where (exists ( select LINK.USER_ID_ from ACT_HI_IDENTITYLINK LINK where USER_ID_ in ("1") and LINK.PROC_INST_ID_ = RES.ID_))) table_count 怎么加索引生效
在这个查询中,需要对以下表的列添加索引:
- ACT_HI_PROCINST:ID_, START_TIME_, END_TIME_, PROC_DEF_ID_
- ACT_HI_VARINST:PROC_INST_ID_, NAME_, TASK_ID_, VAR_TYPE_
- ACT_RU_TASK:PROC_INST_ID_, ASSIGNEE_
你可以使用以下命令添加索引:
```sql
CREATE INDEX idx_act_hi_procinst_id ON ACT_HI_PROCINST (ID_);
CREATE INDEX idx_act_hi_procinst_start_time ON ACT_HI_PROCINST (START_TIME_);
CREATE INDEX idx_act_hi_procinst_end_time ON ACT_HI_PROCINST (END_TIME_);
CREATE INDEX idx_act_hi_procinst_proc_def_id ON ACT_HI_PROCINST (PROC_DEF_ID_);
CREATE INDEX idx_act_hi_varinst_proc_inst_id ON ACT_HI_VARINST (PROC_INST_ID_);
CREATE INDEX idx_act_hi_varinst_name ON ACT_HI_VARINST (NAME_);
CREATE INDEX idx_act_hi_varinst_task_id ON ACT_HI_VARINST (TASK_ID_);
CREATE INDEX idx_act_hi_varinst_var_type ON ACT_HI_VARINST (VAR_TYPE_);
CREATE INDEX idx_act_ru_task_proc_inst_id ON ACT_RU_TASK (PROC_INST_ID_);
CREATE INDEX idx_act_ru_task_assignee ON ACT_RU_TASK (ASSIGNEE_);
```
注意,添加索引可能会影响数据库的性能和空间消耗,因此需要根据具体情况进行权衡和测试。
driver.get_screenshot_as_png
As an AI language model, I do not have access to a web driver or browser. However, I can explain what the method `get_screenshot_as_png` does.
`get_screenshot_as_png` is a method in Selenium WebDriver that captures a screenshot of the current web page as a PNG image file. The method returns the screenshot as a byte string in PNG format. This method can be useful for debugging and testing web applications to ensure that the correct page elements are displayed and that the page is rendered correctly. The screenshot can also be used for reporting and documentation purposes.