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Fix slow SQL queries #4

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merged 2 commits into from
Dec 19, 2019
Merged

Fix slow SQL queries #4

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25d89b0
Optimize get_number_of_addresses
easeev Dec 19, 2019
f126a72
Optimize get_recent_transactions_as_json
easeev Dec 19, 2019
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20 changes: 12 additions & 8 deletions Mce/DataStore.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3780,8 +3780,10 @@ def get_number_of_addresses(store, chain):
"""
result = -1
countrow = store.selectrow("""
SELECT COUNT(DISTINCT(pubkey_hash)) FROM txout_detail WHERE chain_id = ?
""", (chain.id,))
SELECT COUNT(DISTINCT(pubkey.pubkey_hash))
FROM txout
LEFT JOIN pubkey ON (txout.pubkey_id = pubkey.pubkey_id)
""")
if countrow:
result = countrow[0]
if result > 0:
Expand Down Expand Up @@ -3940,12 +3942,14 @@ def get_recent_transactions_as_json(store, chain, limit=10):
"""
# Ignore coinbase transactions where there is no native currency
rows = store.selectall("""
SELECT DISTINCT tx_hash
FROM txout_detail
WHERE chain_id=? AND pubkey_id != ?
ORDER BY block_height DESC, tx_id DESC
LIMIT ?
""", (chain.id, NULL_PUBKEY_ID, limit))
SELECT tx_hash
FROM tx
WHERE tx_id in (SELECT DISTINCT tx_id
FROM txout
WHERE pubkey_id != ?
ORDER BY tx_id DESC
LIMIT ?)
""", (NULL_PUBKEY_ID, limit))

if rows is None:
return []
Expand Down