1. MYSQL Architecture and Parameters
Philip Zhong
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9.  Internal Data Dictionary
 Undo
 Insert Buffer
 Doublewrite Buffer
 MySQL Replication Info
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18. • READ UNCOMMITED - Rarely used, can use if you are fine
with dirty reads but performance improvement is limited
• READ COMMITED – Results of all committed transactions
become visible to the next statement. May be more efficient
than higher isolation levels. Allows old versions to be purged
faster
• REPEATABLE READ – Default. Reads within transactions
are fully repeatable, no phantom rows
• SERIALIZABLE - Makes all selects locking selects, avoid
when possible
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20. My_temp.txt
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21. Thank you.
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